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  5. Installation Operation & Maintenance

AAON M2 Series Installation Operation & Maintenance

Manual is about: Modular Indoor Air Handling Units & Self-Contained Units

Summary of M2 Series

  • Page 1

    Modular indoor air handling units & self-contained units installation, operation & maintenance do not store gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. What to do if you smell gas do not try to light any appliance. Do not touch any electrical switch...

  • Page 3

    3 table of contents safety .............................................................................................................................................. 9 feature string nomenclature .......................................................................................................

  • Page 4

    4 electrical .................................................................................................................................... 59 cutting electrical openings ................................................................................................... 59 thermostat control w...

  • Page 5

    5 split system piping diagrams ...................................................................................................... 98 m2 series startup form .............................................................................................................. 115 maintenance log ............

  • Page 6

    6 index of tables and figures tables: table 1 – electric and gas heating capacities ............................................................................. 35 table 2 - minimum clearances ..................................................................................................... 37 t...

  • Page 7

    7 figures: figure 1 - typical m2 series selection ........................................................................................ 15 figure 2 - unit orientation ........................................................................................................... 29 figure 3 - lockable...

  • Page 8

    8 figure 46 - segment retainer ....................................................................................................... 76 figure 47 - segment installation ................................................................................................... 76 figure 48 - belt replaceme...

  • Page 9: Safety

    9 safety electric shock, fire or explosion hazard failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death, or property damage. Before servicing, disconnect a...

  • Page 10: Warning

    10 electric shock hazard. Before servicing, shut off all electrical power to the unit, including remote disconnects, to avoid shock hazard or injury from rotating parts. Follow proper lockout-tagout procedures. Warning variable frequency drives do not leave vfds unattended in hand mode or manual byp...

  • Page 11: Caution

    11 electric motor over-current protection and overload protection may be a function of the variable frequency drive to which the motors are wired. Never defeat the vfd motor overload feature. The overload ampere setting must not exceed 115% of the electric motors fla rating as shown on the motor nam...

  • Page 12: Caution

    12 do not clean dx refrigerant coils with hot water or steam. The use of hot water or steam on refrigerant coils will cause high pressure inside the coil tubing and damage to the coil. Caution to prevent damage to the unit, do not use acidic chemical coil cleaners. Do not use alkaline chemical coil ...

  • Page 13: Warning

    13 hot parts disconnect all power, close all isolation valves and allow equipment to cool before servicing equipment to prevent serious injury. Equipment may have multiple power supplies. Electric resistance heating elements and hot water or steam heating coils may have automatic starts. Hot water w...

  • Page 14

    14 1. Startup and service must be performed by a factory trained service technician. 2. Use only with type of the gas approved for the furnace. Refer to the furnace rating plate. 3. Provide adequate combustion ventilation air to the furnace. If a vent duct extension is used, a class iii approved ven...

  • Page 15

    15 feature string nomenclature base feature string individual module feature string identifies the main unit features and options. Identifies module configurations, features and options. Bbd-101-0-00-00000-00000-0-0 fth-102-p-c0-20000-ce000-c-x hra-103-a-00-00000-00000-0-0 m2-h-026-l-2-a-a-0-c-0 : m...

  • Page 16

    M2 series base feature string nomenclature model options gen t y pe u n it s iz e s u ppl y a ir fl ow v olt a g e a s s e m b l y wir in g pa in t b a s e r a il s pe c ia l m2 - h - 011 - r - 2 - a - a - 0 - c - 0 16 m2 series base feature string nomenclature base model description series and gene...

  • Page 17

    Fan module feature string nomenclature m od u l e id pos it ion m otor s iz e b l o we r is olation m otor t y pe b l a n k pu l l e y s s a fe t y c on t r ol b l a n k b l a n k s pe c ia l sdd - 103 - j - b i - f 00 00 - a 0000 - 0 - 0 17 fan mo dule descriptio n fan module description module id ...

  • Page 18

    Filter module feature string nomenclature m od u l e id pos it ion fil t e r t y pe fil t e r s s a fe t y c on t r ol b l a n k 2 nd fi l t e r t y pe 2 nd fi l t e r b l a n k fil t e r opt ion s s pe c ia l fta - 102 - p - a0 - 0 0000 - 0 00 00 - 0 - 0 18 filter module descriptio n filter module ...

  • Page 19

    Mixing module feature string nomenclature m od u l e id pos it ion a c t u a t or t y pe fil t e r s s a fe t y c on t r ol b l a n k b y pa s s ope n in g b l a n k fil t e r opt ion s s pe c ia l mbh - 101 - a - 00 - 0 0000 - 0 0000 - 0 - 0 19 mixin g mod ule descriptio n mixing module description...

  • Page 20

    Heat module feature string nomenclature m od u l e id pos it ion fu n c t ion fil t e r s r ows fpi c ir c u it in g c oa t in g heat c a pa c it y s t a ges fu e l ga s c om b in t a ke fil t e r opt ion s s pe c ia l pha - 104 - h - 00 - 0 00 0 0 - e 02 0 0 - 0 - 0 20 heat module descripti on heat...

  • Page 21

    Heat module feature string nomenclature m od u l e id pos it ion fu n c t ion fil t e r s r ows fpi c ir c u it in g c oa t in g heat c a pa c it y s t a ges fu e l ga s c om b in t a ke fil t e r opt ion s s pe c ia l pha - 101 - h - 00 - 0 00 0 0 - e 02 0 0 - 0 - 0 21 stages 00 = hot water heating...

  • Page 22

    Blank module feature string nomenclature m od u l e id pos it ion b l a n k a ir wa y t y pe s a fe t y c on t r ol b l a n k b y pa s s ope n in g b l a n k d r a in pa n t y pe s pe c ia l bba - 101 - 0 - ar - 0 0000 - 0 0000 - 0 - 0 22 blan k m odule descript ion blank module description module i...

  • Page 23

    Cooling coil module feature string nomenclature m od u l e id pos it ion c oo l in g t y pe e l e c t r ic heat k w e l e c hea t s t a ges heatin g c oil r ows heatin g c oil fp i heatin g c oil c kt heat c oi l c oa t in g c oo l in g c oil r ows c oo l in g c oil fp i c oo l in g c oil c kt c oo ...

  • Page 24

    Cooling coil module feature string nomenclature m od u l e id pos it ion c oo l in g t y pe e l e c t r ic heat k w e l e c hea t s t a ges heatin g c oil r ow s heatin g c oil fp i heatin g c oil c kt heat c oi l c oa t in g c oo l in g c oil r ows c oo l in g c oil fp i c oo l in g c oil c kt c oo...

  • Page 25

    Controls module feature string nomenclature m od u l e id p os it ion b l a n k b l a n k s a fe t y c on t r ol b l a n k b l a n k b l a n k s pe c ia l tra - 101 - 0 - 00 - 0 0000 - 00000 - 0 - 0 25 control s mo dule descripti on controls module description module id tra = small trb = medium trc ...

  • Page 26

    Energy recovery module feature string nomenclature m od u l e id pos it ion whe e l s iz e r e c ov e r y t y pe b l a n k b l a n k v fd c on t r ol s pe c ia l hra - 102 - a - 00 - 00000 - 00000 - 0 - 0 26 energy recovery module description energy recovery module description module id hra = aaonai...

  • Page 27

    Water-source heat pump module feature string nomenclature m od u l e id pos it ion r e v is ion c a pa c it y c om p s t a gin g b l a n k r e fr ig opt ion s r e fr ig a c c e s s b l a n k wa t e r s id e he at e xc hange r b l a n k s pe c ia l whp - 204 - a - 25 - d k 000 - d a 0 h 0 - 0 - 0 27 ...

  • Page 28

    Water-source heat pump module feature string nomenclature m od u l e id pos it ion r e v is ion c a pa c it y c om p s t a gin g b l a n k r e fr ig opt ion s r e fr ig a c c e s s b l a n k wa t e r s id e he at e xc hange r b l a n k s pe c ia l whp - 204 - a - 25 - d k 000 - d a 0 h 0 - 0 - 0 28 ...

  • Page 29: Unit Orientation

    29 unit orientation determine left hand or right hand orientation/connections: figure 2 - unit orientation consider the airflow to be hitting the back of your head. M2 series top view return air “back” supply air “front” left hand side right hand side connections & service access on left side for le...

  • Page 30: General Information

    30 general information m2 series modular indoor air handling units and self-contained units have been designed for indoor installation. Flexible connectors are required on all duct connections to minimize air leaks. M2 series units are designed for safe operation when installed, operated and maintai...

  • Page 31: Warning

    31 c. Certified with refrigerant r-410a coils or with chilled water cooling coils. Codes and ordinances m2 series units have been tested and certified, by etl, in accordance with the ul safety standard 1995/csa c22.2 no. 236. System should be sized in accordance with the american society of heating,...

  • Page 32

    32 all doors with locks or nuts and bolts to prevent unauthorized access. Figure 3 - lockable handle storage if installation will not occur immediately following delivery, store equipment in a dry protected area away from construction traffic and in the proper orientation as marked on the packaging ...

  • Page 33: Caution

    33 never cut off the main power supply to the unit, except for servicing, emergency, or complete shutdown of the unit. When power is cut off from the unit, crankcase heaters cannot prevent refrigerant migration into the compressors. This means the compressor will cool down and liquid refrigerant may...

  • Page 34: Caution

    34 note: low ambient operation air-cooled dx units without a low ambient option, such as condenser fan cycling, ecm driven condenser fans or the 0°f low ambient option, will not operate in the cooling mode of operation properly when the outdoor temperature is below 55°f. Low ambient and/or economize...

  • Page 35

    35 table 1 – electric and gas heating capacities.

  • Page 36: Installation

    36 installation the m2 can either be shipped assembled or shipped in individual modules. See the module assembly section of this document for instructions on individual modules. Locating units verify foundation or mounting frame can support the total unit weight, including accessory weights. Before ...

  • Page 37: Caution

    37 figure 4 - service access clearance table 2 - minimum clearances unit size minimum required service clearance x = m2-005 50” m2-008 50” m2-011 62” m2-014 62” m2-018 84” m2-022 84” m2-026 84” m2-032 96” m2-036 96” lifting the assembled unit units may be delivered as separate modules or completely ...

  • Page 38

    38 figure 5 - m2 series unit four point lifting.

  • Page 39

    39 figure 6 - m2 series unit eight point lifting.

  • Page 40

    40 lifting the individual modules the bottom tier individual modules have lifting lugs built into the base. Individual bottom tier modules can be lifted by securing hooks and cables at all four lugs provided on the module. Figure 7 - m2 series individual module bottom tier lifting the top tier indiv...

  • Page 41

    41 figure 9 - unit suspension module assembly although m2 series modular units are shipped factory assembled as standard, the unit may be ordered as individual modules for certain applications such as for assembly in existing structures where modules must be manipulated separately. If the unit was o...

  • Page 42

    42 hand unit, or the top right as you face the access side of a left hand unit. Therefore, it is possible to identify the exact module arrangement even without knowing the module type, and without a configuration schematic. If, for any reason, a module or its position in final assembly is unidentifi...

  • Page 43

    43 figure 10 - module assembly schematic configuration schematic can be found in unit literature packet configuration: m2-h-011-r-2-a-a-0-c-0 ftf-101-p-a0-00000-00000-0-0 hra-102-a-00-00000-00000-0-0 clf-103-c-00-210f0-610f0-s-0 sfa-104-k-c0-a0000-00000-0-0 pec-201-k-bi-a0000-00000-0-0 fte-203-p-b0-...

  • Page 44

    44 2. Connect modules modules are to be connected with nuts and bolts through the base rail and with metal strapping over module joints. Metal straps have adhesive backs and are to be additionally fastened to the unit case with sheet metal screws. All connection hardware is shipped with the unit. Al...

  • Page 45

    45 figure 14 - strap types figure 15 - strap locations figure 16 - strap positioning figure 17 - strap installation 4. Run power and control wiring m2 series units are equipped with an internal wiring chase, located along the inside top of each module. Wire is provided for power and control wiring i...

  • Page 46

    46 wire from the unit to external controls and power sources must be provided in the field. A color-coded wiring diagram is laminated and affixed to the inside of the control compartment access door. M2 series units are equipped with a single point power connection. 5. Final sealing it is very impor...

  • Page 47: Caution

    47 evaporator coils the air handling unit coils are pressurized. The copper caps must be punctured to permit a gradual escape of the pressure prior to un-sweating those caps. Immediately couple the tubing to the indoor unit to avoid exposing the coils to moisture. A properly sized filter drier is fu...

  • Page 48: Warning

    48 open loop applications this product contains one or more refrigerant-to-water heat exchangers made of 316 stainless steel. 316 stainless steel is subject to severe corrosion and failure when exposed to chlorides. Do not allow water containing any form of chlorides to enter this heat exchanger. Co...

  • Page 49: Warning

    49 unit is capable of operating with entering water temperatures (ewt) as low as 50°f during heat pump heating mode without the need for head pressure control. If the ewt is expected to be lower than 50°f or more stable operation is desired, a field provided water regulating valve may be used. Glyco...

  • Page 50: Warning

    50 the water-cooled only units have water supply to the bottom of the heat exchanger and the return to the top. Figure 22 - water-cooled only water piping condenser water connections range in size from 1”-3” od copper or grooved black pipe. Only use approved water pipe material. Avoid using galvaniz...

  • Page 51: Caution

    51 before connection to the unit the condenser water system should be flushed to remove foreign material that could cause condenser fouling. Install a screen strainer with a minimum of 20 mesh ahead of the condenser inlet to prevent condenser fouling and internal tube damage. Mineral content of the ...

  • Page 52: Caution

    52 heat exchanger safeties electronic freeze protection and water flow safeties should be field installed or factory provided. If the leaving water temperature drops below 38°f or water flow has ceased the 24vac control circuit will be broken to disable the cooling system. Waterside economizer cooli...

  • Page 53

    53 during mechanical cooling only mode of operation, condenser water flows around the waterside economizer coil with the waterside economizer bypass valve fully open. The condenser water then passes through the water-cooled condenser and the valves modulate to maintain head pressure. Mineral content...

  • Page 54: Caution

    54 across the coil is going to be below this value, use a glycol solution to match the coldest air expected. Water supply lines must be insulated, properly fastened, drained, and supported according to local code requirements. Chilled water coils four, six, or eight row chilled water cooling coils c...

  • Page 55

    55 note: the drain pan connection is a 1” mpt fitting. Figure 27 - draw-through drain trap table 9 - drain trap dimensions draw-through drain pan pressure trap dimensions negative static x x/2 (inches of water) (inch) (inch) -0.50 1.50 0.75 -1.00 2.00 1.00 -1.50 2.50 1.25 -2.00 3.00 1.50 -2.50 3.50 ...

  • Page 56

    56 pressure in the drain pan. To find the pressure subtract any pressure drops between the drain pan and the supply blower from the blower discharge pressure. The worst-case scenario for blow-through coils is the minimum pressure drop, so do not include dirt allowance pressure drops for filters. The...

  • Page 57

    57 figure 31 – potentiometer note, the potentiometer is still active in the electrical loop. The potentiometer dial should be set for the maximum fan speed for a particular application. Maximum fan speed is determined by the ecat submittal. Typically, this max speed will be the rpm set at the factor...

  • Page 58

    58 figure 32 - supply fan banding.

  • Page 59: Warning

    59 electric heating heating is accomplished by passing electrical current through a specified amount of resistance heaters which will produce the required heat. The indoor fan motor will energize at the same time as the heaters. Wiring to the air handling unit must be done in accordance with local e...

  • Page 60: Caution

    60 if a larger cut-out is needed for additional duct connections not provided by the factory, or for any other reason, it is very important that the foam be completely sealed. Insulation covers should be fabricated from sheet metal to cover the foam at the cut. The edges and corners that are not cov...

  • Page 61: Caution

    61 wire control signals to the unit’s low voltage terminal block located in the controls compartment. If any factory installed wiring must be replaced, use a minimum 105°c type awm insulated conductors. Thermostat control wiring if a thermostat is used for unit control, thermostat should be located ...

  • Page 62: Warning

    62 gas fired duct furnace inspection on arrival 1. Inspect unit upon arrival for any damage that may have occurred during shipping. 2. Prior to installation locate rating plate and verify that furnace is equipped for the available fuel supply and power supply at point of installation. Unit location ...

  • Page 63: Warning

    63 4. A 1/8” npt tap is provided on the inlet side of the gas valve to the heater. A fitting suitable for connection to a pressure gauge capable of measuring gas pressure should be connected to each heater serviced by a single regulator so that gas pressure at each heater can be measured with all he...

  • Page 64

    64 condensate buildup and possible heat exchanger damage. 3. If heating section is located downstream of a refrigeration system or cooling coil, condensation can occur during operation of the air conditioning, resulting in condensation from warm, moist air in the heat exchanger tubes and flue collec...

  • Page 65: Warning

    65 startup 1. Turn thermostat or temperature controller to its lowest setting. 2. Turn off gas supply at the manual shut-off valve (supplied by others). 3. Turn off power to the unit at the disconnect switch. 4. Open door to unit module housing the gas heater. 5. Move gas control knob to “off” posit...

  • Page 66: Warning

    66 burner flames prior to completing the start-up, check the appearance of the main burner flame. See figure 37 - 1.2” w.C. Manifold and figure 38 - 3.5” w.C. Manifold for flame characteristics of properly adjusted natural gas systems. Figure 37 - 1.2” w.C. Manifold natural gas figure 38 - 3.5” w.C....

  • Page 67

    67 shutdown 1. Set thermostat or controller to lowest setting. 2. Turn off electrical supply to unit at disconnect switch. 3. Turn off manual gas supply (supplied by others). 4. Disconnect manifold and inlet pressure taps and re-install pipe plugs. 5. Close module door. Normal operation 1. Turn on e...

  • Page 68

    68 of the air inlet or outlet to the unit. The high limit switch will automatically reset when the temperature drops to 15ºf below the set point. Determine the cause of the reduced air flow and correct. Ignition control diagnostics and service guide (fenwal 35-61 series). Led flashes on for ¼ second...

  • Page 69

    69 table 14 - gas heater troubleshooting continued led code system description actions 2 flash flame fault (no call for heat) flame sense failure / flame present with no call for heat. 1. Check for voltage to gas valve with thermostat in off position. Valve should not be powered. 2. If valve is not ...

  • Page 70: Warning

    70 operating control systems two stage (tn) - low / high fire / high speed inducer only modulating (md) - modulating (25 to 100%) / 2 speed draft inducer - mid-fire start (55%) modulating (mh) - modulating (25 to 100%) / 2 speed draft inducer - high fire start (100%) refer to unit wiring diagrams lo...

  • Page 71

    71 duct furnace operation check 1. Turn on power to the unit and set thermostat or heat controller to call for heat, allowing duct furnace to operate. 2. Check for proper start-up and ignition as outlined in start-up section. 3. Check the appearance of the burner flame. 4. Check that the circulating...

  • Page 72: Warning

    72 seal and wheel. Racking of the unit or cassette during installation, and/or mounting of the unit on a non-level support or in other than the factory orientation can change seal clearances. Tight seals will prevent rotation. Figure 41 - cross section of air seal structure wheel to air seal clearan...

  • Page 73

    73 rigging as shown in the following illustration. Figure 42 - lifting hole locations routine maintenance of the energy recovery cassettes includes periodic cleaning of the energy recovery wheel as well as inspection of the air seals and wheel drive components as follows: cleaning the need for perio...

  • Page 74: Caution

    74 air seals four adjustable diameter seals are provided on each cassette to minimize transfer of air between the counter flowing airstreams. To adjust diameter seals, loosen diameter seal adjusting screws and back seals away from wheel surface. Rotate wheel clockwise until two opposing spokes are h...

  • Page 75: Caution

    75 figure 43 - avoid racking of cassette frame operation startup procedure 1. By hand, turn wheel clockwise (as viewed from the pulley side), to verify wheel turns freely through 360º rotation. 2. Before applying power to drive motor, confirm wheel segments are fully engaged in wheel frame and segme...

  • Page 76: Caution

    76 service segment installation & replacement wheel segments are secured to the wheel frame by a segment retainer which pivots on the wheel rim and is held in place by a segment retaining catch. Figure 46 - segment retainer to install wheel segments follow steps one through five below. Reverse proce...

  • Page 77: Caution

    77 4. While supporting weight of drive motor in one hand, loosen and remove (4) mounting bolts. 5. Install replacement motor with hardware kit supplied. 6. Install pulley to dimension as shown and secure set screw to drive shaft. 7. Stretch belt over pulley and engage in groove. 8. Follow start-up p...

  • Page 78: Startup

    78 startup (see back of the manual for startup form) during startup, it is necessary to perform routine checks on the performance of the unit. This includes checking of the air flow, the air filters, condenser water flow and refrigerant charge. Filters do not operate the unit without filters in plac...

  • Page 79

    79 2. Ensure there is no construction debris in the unit. 3. Check the unit for external damage. 4. Note all accessories installed. 5. Install new filters of the proper size and type. 6. Check all terminal blocks, fuses, fuse blocks, and contactors for correctness. 7. Check all high and low voltage ...

  • Page 80

    80 2. Turn off gas supply at the manual shut-off valve (supplied by others). 3. Turn off power to the unit at the disconnect switch. 4. Open door to unit module housing the gas heater. 5. Move gas control knob to “off” position. 6. Install a tapped fitting for attachment to a manometer or other gaug...

  • Page 81: Caution

    81 maintenance list provided later in this manual. Adjusting refrigerant charge adjusting the charge of a system in the field must be based on determination of liquid sub-cooling and evaporator superheat. On a system with a txv liquid sub-cooling is more representative of the charge than evaporator ...

  • Page 82: Caution

    82 table 15 - acceptable air-cooled refrigeration circuit values air-cooled cond./air-source heat pump sub-cooling** 8-15°f / 2-4°f (hp)* sub-cooling with hot gas reheat** 8-15°f / 2-6°f (hp)* superheat*** 8-15°f *in cooling mode operation **sub-cooling must be increased by 2°f per 20 feet of vertic...

  • Page 83

    83 table 17 - r-410a refrigerant temperature-pressure chart °f psig °f psig °f psig °f psig °f psig 20 78.3 47 134.7 74 213.7 101 321.0 128 463.2 21 80.0 48 137.2 75 217.1 102 325.6 129 469.3 22 81.8 49 139.7 76 220.6 103 330.2 130 475.4 23 83.6 50 142.2 77 224.1 104 334.9 131 481.6 24 85.4 51 144.8...

  • Page 84

    84 refrigeration troubleshooting table 18 – refrigeration problems, causes, and solutions problem possible cause solutions frosted evaporator coil, low suction pressure restricted air flow low fan speed reversed blower rotation low refrigerant charge clean, or replace filters check fan drives correc...

  • Page 85: Maintenance

    85 maintenance (see back of the manual for maintenance log.) at least once each year, a trained, qualified service technician should check out the unit. Fans, evaporator coils, and filters should be inspected at least monthly. One week after start-up: check operating pressures. Adjust belt tension o...

  • Page 86

    86 table 19 - bearing setscrew torque recommendations shaft size (inches) setscrew locking thread torque (in-lbs.) 1 1/4 - 28 66 - 85 1 3/16 1/4 - 28 66 - 85 1 7/16 5/16 - 24 126 - 164 1 7/8 3/8 - 24 228 - 296 shaft size (inch) skewzloc locking thread torque (in-lbs.) 1 8 - 32 63 - 70 1 3/16 8 - 32 ...

  • Page 87: Warning

    87 indoor coils indoor cooling/evaporator coils must be cleaned regularly to maintain unit efficiency and operation. Dirty evaporator coils will eventually freeze up and often result in a time consuming and expensive service call. Clean filters will help to prevent dirt from accumulating on cooling ...

  • Page 88: Caution

    88 quarterly cleaning is essential to extend the life of an e-coated coil and is required to maintain coating warranty coverage. Coil cleaning shall be part of the unit’s regularly scheduled maintenance procedures. Failure to clean an e-coated coil will void the warranty and may result in reduced ef...

  • Page 89

    89 electric heating set thermostat in the heat mode; call for heat to engage all electric heat strips. Check blower for proper rotation and voltage. Measure the amperage and voltage. Compare them to the nameplate data. If applicable, check remote heat pump condenser as per the manufacturer’s recomme...

  • Page 90

    90 table 20 - fan bearing lubrication schedule fan speed temp. Environ. Greasing interval 500 rpm up to 150 f clean 2 to 6 months 1000 rpm up to 210 f clean 2 weeks to 2 months 1500 rpm up to 210 f clean monthly any speed up to 150 f dirty 1 week to 1 month any speed 210 - 250 f dirty weekly in the ...

  • Page 91

    91 phase and brownout protection module the dpm is a digital phase monitor that monitors line voltages from 200vac to 240vac 1 ɸ and 200vac to 600vac 3 ɸ . The dpm is 50/60 hz self-sensing. Dpm should be wired according to unit specific wiring diagram include in the control compartment when the dpm ...

  • Page 92

    92 screens manufacturer’s screen r-k electronics dpm v0.0.00 average voltage screen vavg imb hz 460 0 60 off default – the default screen shows the real time voltage detected in each of the 3 phases: a-b b-c c-a 460 459 461 on voltage selection screen (vertical format) default = 460v, 3 Ø 200, 1Ø; 2...

  • Page 93: Warning

    93 filter replacement monthly air filter inspection is required to maintain optimum unit efficiency. It is strongly recommended that filter media be replaced monthly. Open access panel and pull filters straight out to inspect all of the filters. Replace filters with the size indicated on each filter...

  • Page 94

    94 table 23 - m2-018 and m2-022 filters filter type (quantity) size m2-018 m2-022 2” pleated - 30% eff, merv 8 (8) 20” x 20” (4) 25” x 20” (4) 20” x 20” 4” pleated - 30% eff (merv 8), 65% eff (merv 11), 85% eff (merv 13), or 95% eff (merv 14) 12” cartridge - 65% eff (merv 11), 85% eff (merv 13), or ...

  • Page 95

    95 figure 52 - filter layout (viewed from the upstream side of the cooling coil).

  • Page 96

    96 appendix a - heat exchanger corrosion resistance corrosion resistance of copper and stainless steel in brazed plate heat exchangers - points to measure and check in a water analysis the resistance guide provides the corrosion resistance of stainless steel type aisi 316 and pure copper (99.9%) in ...

  • Page 97

    97 water containing concentration (mg/l or ppm) time limits - analyze before aisi 316 smo 254 copper alloy nickel alloy total hardness (°dh) 4.0-8.5 no limit + + + + nitrate (no 3 ) no limit + + + + > 100 + + 0 + iron (fe) no limit + + + + > 0.2 + + 0 + aluminum (al) no limit + + + + > 0.2 + + 0 + m...

  • Page 98

    98 split system piping diagrams figure 53 - a/c split system piping, suction down.

  • Page 99

    99 figure 54 - a/c split system piping, suction up.

  • Page 100

    100 figure 55 - a/c with lac split system piping, suction up.

  • Page 101

    101 figure 56 - a/c with modulating hot gas reheat split system piping, suction down.

  • Page 102

    102 figure 57 - a/c with modulating hot gas reheat split system piping, suction up.

  • Page 103

    103 figure 58 - a/c with hot gas bypass split system piping, suction down.

  • Page 104

    104 figure 59 - a/c with hot gas bypass split system piping, suction up.

  • Page 105

    105 figure 60 - a/c with modulating hot gas reheat and hot gas bypass split system piping, suction down.

  • Page 106

    106 figure 61 - a/c with modulating hot gas reheat and hot gas bypass split system piping, suction up.

  • Page 107

    107 figure 62 - heat pump split system piping, suction down.

  • Page 108

    108 figure 63 - heat pump split system piping, suction up.

  • Page 109

    109 figure 64 - heat pump with modulating hot gas reheat split system piping, suction down.

  • Page 110

    110 figure 65 - heat pump with modulating hot gas reheat split system piping, suction up.

  • Page 111

    111 figure 66 - heat pump with hot gas bypass split system piping, suction down.

  • Page 112

    112 figure 67 - heat pump with hot gas bypass split system piping, suction up.

  • Page 113

    113 figure 68 - heat pump with modulating hot gas reheat and hot gas bypass split system piping, suction down.

  • Page 114

    114 figure 69 - heat pump with modulating hot gas reheat and hot gas bypass split system piping, suction up.

  • Page 115: M2 Series Startup Form

    115 m2 series startup form job name:_______________________________________________ date:______________ address:______________________________________________________________________ ______________________________________________________________________________ model number:_________________________...

  • Page 116

    116 ambient temperature ambient dry bulb temperature ________°f ambient wet bulb temperature ________°f supply fan assembly alignment check rotation nameplate amps________ number hp l1 l2 l3 1 2 band size_____________________ vav controls_________________ vfd frequency________________ springs operat...

  • Page 117

    117 outside air/economizer dampers oa operation check damper wiring check gears check ra operation check damper wiring check gears check ea operation check damper wiring check gears check damper actuator type:__________________________________________________________ economizer changeover type and o...

  • Page 118

    118 refrigeration system 2 - cooling mode pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/a refrigeration system 3 - cooling mode pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/...

  • Page 119

    119 refrigeration system 4 - heating mode (heat pump only) pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/a air-cooled condenser alignment check rotation nameplate amps________ number hp l1 l2 l3 1 2 3 4 5 6 water/glycol system 1. Has the...

  • Page 120

    120 electric heating stages__________ limit lockout aux. Limit lockout stage amps stage amps 1 5 2 6 3 7 4 8 electric preheating limit lockout aux. Limit lockout outside air temperature setpoint__________°f preheat leaving air temperature setpoint__________°f stage amps stage amps 1 3 2 4.

  • Page 121

    121 maintenance log this log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. Aaon service and warranty departments are available to advise and provide phone help for proper operation and replaceme...

  • Page 122

    Literature change history march 2010 update of iom adding gas heater, self-contained unit and packaged rooftop unit information. July 2010 update of iom adding pvc and cpvc piping caution and split system piping information. November 2010 update of iom adding control wiring information, correcting m...

  • Page 123

    May 2016 updated base model description to include air flow. Added 30hp motor to motor size in the feature string. Included more details under heat capacity in the feature string. Added the cb_ modules to blank module feature string. Updated coil options in the coil module feature strings. Updated o...

  • Page 124

    Aaon 203 gum springs road longview, tx 75602-1721 phone: 903-236-4403 fax: 903-236-4463 www.Aaon.Com m2 series installation, operation & maintenance r40681 · rev. D · 170412 (acp 30752) it is the intent of aaon to provide accurate and current product information. However, in the interest of product ...