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AAON RN Series Installation, Operation & Maintanance Manual - Warning

Other manuals for RN Series: Installation operation & maintenance
Manual is about: Packaged Rooftop Units, Heat Pumps, & Outdoor Air Handling Units

Summary of RN Series

  • Page 1

    Rn series packaged rooftop units, heat pumps, & outdoor air handling units installation, operation, & maintenance o do not store gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance o what to do if you smell gas  do not try to light any appliance.  do not t...

  • Page 3

    3 table of contents safety .............................................................................................................................................. 8 rn series feature string nomenclature ....................................................................................... 13...

  • Page 4

    4 power return axial flow fans (16-25 and 30 tons) ................................................................ 73 power return and exhaust axial flow fans (26 and 31-140 tons) .......................................... 75 filters ....................................................................

  • Page 5

    5 index of tables and figures tables: table 1 - electric and gas heating capacities ............................................................................. 27 table 2 - a cabinet unit clearances ............................................................................................ 29 tab...

  • Page 6

    6 table 42 - 26, 31, and 40 ton unit filters ..................................................................................... 99 table 43 - 50, 60, and 70 ton unit filters ..................................................................................... 99 table 44 - 55, 65, and 75 ton unit...

  • Page 7

    7 figure 34 - fan with the hub on the top and ret on the bottom ............................................. 74 figure 35 - bushing mount location ............................................................................................ 74 figure 36 - ret with pin in groove 4 ......................

  • Page 8: Safety

    8 safety 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 what to do if you smell gas  do not try to turn on unit.  shut off main g...

  • Page 9: Warning

    9 variable frequency drives do not leave vfds unattended in hand mode or manual bypass. Damage to personnel or equipment can occur if left unattended. When in hand mode or manual bypass mode vfds will not respond to controls or alarms. Warning grounding required all field installed wiring must be co...

  • Page 10: Warning

    10 water pressure prior to connection of condensing water supply, verify water pressure is less than maximum pressure shown on unit nameplate. To prevent injury or death due to instantaneous release of high pressure water, relief valves should be field supplied on system water piping. Warning do not...

  • Page 11: Warning

    11 open loop applications failure of the condenser as a result of chemical corrosion is excluded from coverage under aaon inc. Warranties and the heat exchanger manufacturer’s warranties. Warning cleaning the cooling tower or condenser water loop with harsh chemicals such as hydrochloric acid (muria...

  • Page 12: Warning

    12 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. The unit is for outdoor use only. See general information section for more information. 4. Provide adequate combustion...

  • Page 13

    13 rn series feature string nomenclature : s ize v lt co nf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 14a 14b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – bb 0 2 – 3 8 4 : a 0 0 0 – d 0 b – deh – 0 ba – 0 d 0 0 0 0 l – 0 0 – 0 0 b 0 0 0 0...

  • Page 14

    14 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 15

    15 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 16

    16 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 17

    17 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 18

    18 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d eh – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 b...

  • Page 19

    19 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 ba – 0 d 0 0 0 0 l – 0 0 – 0 0 b...

  • Page 20

    20 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 21

    21 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 22

    22 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 23

    23 rn series feature string nomenclature : s iz e vl t c onf ig a1 a2 a3 a4 b1 b2 b3 1 a 1 b 1 c 1 d 2 3 4 5 a 5 b 5 c 6 a 6 b 6 c 7 8 9 1 0 1 1 1 2 1 3 1 4 a 1 4 b 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 rn – 0 2 5 – 3 – 0 – b b 0 2 – 3 8 4 : a 0 0 0 – d 0 b – d e h – 0 b a – 0 d 0 0 0 0 l – 0 0 – 0 0 ...

  • Page 24: General Information

    24 general information rn series packaged rooftop units, heat pumps and outdoor air handling units have been designed for outdoor installation only. Units are assembled, wired, charged and run tested at the factory. Startup and service must be performed by a factory trained service technician. Certi...

  • Page 25: Warning

    25 installation of rn series units must conform to the icc standards of the international mechanical code, the international building code, and local building, plumbing and waste water codes. In the absence of local codes installation must conform to the current (united states) national fuel gas cod...

  • Page 26: Caution

    26 the warranty card must be completed in full and returned to aaon not more than 3 months after unit is delivered. 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...

  • Page 27: Caution

    27 concentration builds up, oil is washed out of the compressor, leaving it starved for lubrication. The compressor life will be seriously shorted by reduced lubrication and the pumping of excessive amounts of liquid oil and refrigerant. Note: low ambient operation air-cooled dx units without a low ...

  • Page 28: Caution

    28 model option b2 gas heat electric heat input capacity output capacity capacity mbh mbh kw (208v) kw (230v, 380v 460v, 575v) 1 = heat 1 60.0 48.0 7.5 10 2 = heat 2 90.0 72.0 15.0 20 3 = heat 3 100.0 80.0 22.5 30 4 = heat 4 270.0 218.7 30.0 40 5 = heat 5 140.0 112.0 37.5 50 6 = heat 6 390.0 315.9 4...

  • Page 29: Installation

    29 installation aaon equipment has been designed for quick and easy installation. Locating units the curb should be mounted first and must be located so that duct connections will be clear of structural members of the building. Verify rooftop or foundation can support the total unit weight, includin...

  • Page 30

    30 16-25 and 30 tons front - (controls side) 48” back - (outside air) 48” *left side *21” right side 60” top unobstructed *units with a water-cooled condenser or chilled water coil require 48” of clearance on the left side for service access. Figure 2 - rn series a, b and c cabinet, 6-25 and 30 tons...

  • Page 31: Caution

    31 be careful to install the provided neoprene gasket according to the following figure prior to setting the unit on the curb. Where the supply or warm air duct passes through a combustible roof, a clearance of 1 inch must be maintained between the outside edges of the duct and combustible material ...

  • Page 32

    32 figure 5 - rn series 6-8 and 10 ton unit gasket locations.

  • Page 33

    33 figure 6 - rn series 9 and 11-15 ton unit gasket locations.

  • Page 34

    34 figure 7 - rn series 16-25 and 30 ton unit gasket locations.

  • Page 35

    35 figure 8 - rn series 26, 31-50, 60, and 70 ton unit gasket locations.

  • Page 36: Caution

    36 forklifting the unit (6-25 and 30 ton) 6-25 and 30 ton units can be lifted using a forklift. 9, 11-25 and 30 ton units must have forks 72” in length or the forks must have 72” fork extensions. 6-8 and 10 ton units must have forks at least 48” in length. Standard units can be lifted from all sides...

  • Page 37

    37 hoist unit to a point directly above the curb and duct openings. Be sure that the gasket material has been applied to curb. Carefully lower and align the unit with utility and duct openings. Lower the unit until the unit skirt fits around the curb. Some units are designed to overhang the curb. Ta...

  • Page 38

    38 figure 12 - lifting details of a 26, 31-50, 60 and 70 ton unit figure 13 - lifting details of a 55, 65 and 75-140 ton unit.

  • Page 39: Caution

    39 duct connection note: if outside air will be in contact with the air tunnel base of an a, b or c cabinet unit (6-25 and 30 tons), the unit should include the base insulation option or the base must be field insulated. D and e cabinet (26 and 31-140 tons) units include base insulation standard. Fi...

  • Page 40

    40 seismic curb installation using a standard curb with a seismic unit will void the certification of the unit. All mounting details listed must be followed to achieve seismic certification. The aaon unit must be certified to icc-es ac156 when using a seismic curb for seismic certifications to apply...

  • Page 41

    41 figure 16 - seismic solid bottom curb without filters cross section figure 17 - seismic solid bottom curb without filters detail a figure 18 - seismic solid bottom curb without filters detail b.

  • Page 42

    42 figure 19 - seismic rigid mount curb.

  • Page 43

    43 condenser hail guards 90-140 ton units condenser hail guards fold down and become a condenser coil shipping cover on 90-140 ton rn series units with copper tube and aluminum fin condenser coils. Condenser hail guards must be opened before startup of the unit. Figure 20 - 90-140 ton condenser coil...

  • Page 44

    44 figure 21 - 90-140 ton condenser coil guard installation instructions 2 outside air rain hood rain hood must be opened before startup of the unit. Fresh air intake adjustments should be made according to building ventilation of local code requirements. 6-25 and 30 ton units remove the two screws ...

  • Page 45

    45 side pieces to the end of the unit through the flange. Apply silicon caulking along the top and both sides of the rain hood. Take care to seal the top corners where the rain hood attaches to the unit. Figure 22 - 6-25 and 30 ton closed rain hood figure 23 - 6-25 and 30 ton open rain hood 26 and 3...

  • Page 46: Caution

    46 figure 25 - factory supplied end flashings metal mesh filters (6-25 and 30 ton units) metal mesh outside air filters require installation of the filter rack on the intake of the rain hood. Clips which hold the metal mesh filters in the filter rack should face outward. Figure 26 - rain hood with m...

  • Page 47: Caution

    47 electrical verify the unit nameplate agrees with power supply. Connect power and control wiring to the unit as shown in figure i12 and in the unit specific wiring diagram, which shows factory and field wiring and is attached to the inside of the door of the controls compartment. Route power and c...

  • Page 48: Caution

    48 figure 29 - front view of utility entry and power switch from control compartment (55, 65 and 75-140 ton units) size supply conductors based on the unit mca rating. Supply conductors must be rated a minimum of 75°c. Protect the branch circuit in accordance with code requirements. The unit must be...

  • Page 49: Caution

    49 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. Variable speed compressors variable speed compressors with vfd speed control are available on 55,...

  • Page 50: Warning

    50 total wire distance allowable = (quantity of control wires) x (control wire distance) take the total wire distance allowable and divide by the quantity of wires to be connected. This indicates the distance allowable for that size wire. The wiring to the unit must not exceed the total wire distanc...

  • Page 51

    51 table 13 - 55, 65 and 75-140 ton gas connections model option b2 input mbh connections quantity size m 800 2 1” npt n 1600 2 1-1/2” npt p 2400 after verifying gas inlet pressure and manifold pressure the service technician must time the gas flow rate through the gas meter with a stopwatch to veri...

  • Page 52: Caution

    52 = × btu ft mbh 1000 1080 3 1080 ft 3 /hr from the natural gas maximum capacities table, at 100 ft and 1080 ft 3 /hr the required minimum pipe size is 2”. A 100 ft pipe run is needed for a 270 mbh propane gas heater. 270 mbh = 270 kbtu/hr from the propane gas maximum capacities table, at 100 ft an...

  • Page 53

    53 petroleum gases. If flexible gas piping to the unit, or in the unit, must be replaced connectors cannot be reused, only new connectors may be used. Heat exchanger comes equipped with a condensate drain which should be plumbed to the appropriate drain according to the (united states) national fuel...

  • Page 54: Caution

    54 operating the appliance and at least on an annual basis thereafter. All gas fired heat exchangers are completely tested at the factory before shipment. This will remove nearly all of the oils that have been used in the manufacturing process. However, trace amounts may remain. When performing the ...

  • Page 55: Caution

    55 do not allow water containing any form of chlorides to enter this heat exchanger. Common forms of chlorides include: 1. Sea water mist entering an open cooling tower system. 2. Contaminated makeup water containing salt water. 3. Disinfecting the water loop with solutions containing sodium hypochl...

  • Page 56: Warning

    56 failure of the condenser due to freezing will allow water to enter the refrigerant circuit and will cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water freezing in the condenser is excluded from coverage under aaon warranties and the heat...

  • Page 57: Caution

    57 table 18 - standard brazed plate heat exchanger water connections model (rn-) supply and return connection size 006, 007 1” npt 008, 010, 009, 011, 013, 015, 016, 018, 020 1 1/2” npt 025, 030 2” npt 026, 031, 040 2 1/2” grooved pipe 050, 055, 060, 070 3” grooved pipe 065, 075, 090, 105 4” grooved...

  • Page 58: Caution

    58 note: ball valves should be installed in the condenser water supply and return lines for unit isolation and water flow balancing. All manual flow valves should be of the ball valve design. Globe or gate valves should not be used due to high pressure drops and poor throttling characteristics. Pres...

  • Page 59: Caution

    59 condensate drain trapping and piping should conform to all applicable governing codes. Heating coils one or two row hot water and steam heating and preheating coils can be factory installed. All valve controls for heating operation are field supplied and field installed. Hot water and steam coil ...

  • Page 60

    60 electric preheat figure 32 - preheat controller the electric preheat controller is factory installed within the preheat cabinet. The following details are for ehc1 version 1.10 of the preheat controller. Status display screens these screens are access by pressing either the left or right controll...

  • Page 61

    61 6. Lltset - “low limit time” temperature (°f) setpoint. If this temperature is not reached at full output, relay will pull in. 7. Stage - current operating stage 1-6. 8. Stage - current operating stage 1-6. Mod - modulation rate % being applied to stage one heat strip scr. 9. Oat - outside air in...

  • Page 62

    62 2. Belowllt - "below low limit time". Range = 10sec-1800sec, and the default is 10sec. If ‘lltset’ temperature is not reached within ‘belowllt’ after reaching full output, the status relay will operate. 3. Stages - number of stages. Range = 1-6, and the default is 1. The number of stages can be d...

  • Page 63

    63 expire in ten minutes if not manually cancelled by resetting ‘manstg’ back to zero. Led flash alarm codes the flashing red led will be to the right of the screen. The number of blinks is described below. The lcd screen will also display the screens. 1 = lata probe open/short 2 = latb probe open/s...

  • Page 64: Warning

    64 maintain the setpoint ‘latset’ to a maximum number of stages set in setpoint ‘stages’. If a safety is reached with the controller’s safety sensors then the electric preheat will be de-energized for a period of 2 minutes. Electric preheat will turn on stage one at 100% for 3 minutes to test if fau...

  • Page 65

    65 the initial setup and servicing of the energy recovery wheel is very important to maintain proper operation efficiency and building occupant comfort. Normal maintenance requires periodic inspection of filters, the cassette wheel, drive belts, air seals, wheel drive motor, and its electrical conne...

  • Page 66: Warning

    66 at a time to provide slip fit clearance when the wheel is rotated by hand. Confirm that the wheel rotates freely. Apply power to the unit and confirm rotation. Airflow balancing and checking high performance systems commonly have complex air distribution and fan systems. Unqualified personnel sho...

  • Page 67: Caution

    67 a characteristic of all dry desiccants, such films can close off micron sized pores at the surface of the desiccant material, reducing the efficiency by which the desiccant can adsorb and desorb moisture and also build up so as to reduce airflow. In a reasonably clean indoor environment such as a...

  • Page 68: Caution

    68 installation considerations energy recovery cassettes are incorporated within the design of packaged units, packaged air handlers and energy recovery ventilators. In each case, it is recommended that the following considerations be addressed: accessibility the cassette and all its operative parts...

  • Page 69: Caution

    69 diameter seal adjustment hub seal adjustment 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. Segment retainer to install wheel segments follow steps one ...

  • Page 70: Caution

    70 center of the wheel and inwards against the spoke flanges. If hand pressure does not fully seat the segment, insert the flat tip of a screw driver between the wheel rim and outer corners of the segment and apply downward force while guiding the segment into place. 4. Close and latch each segment ...

  • Page 71

    71 12. Apply power to wheel and ensure that the wheel rotates freely without interference. Belt replacement.

  • Page 72: Startup

    72 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 the air flow, air filters, condenser water flow, dampers, heaters, and refrigerant charge. Supply fans rn series units are equipped w...

  • Page 73

    73 figure 33 - supply fan banding power return axial flow fans (16-25 and 30 tons) blade pitch angle setting instructions step 1: determine the new required pitch for the fan blades use the fan program in aaon ecat. Step 2: maintain the balance of fan mark the hub/ret castings across a single joint,...

  • Page 74

    74 figure 34 - fan with the hub on the top and ret on the bottom step 3: determine the direction of rotation right, r, is clockwise when facing the discharge side of the fan and left, l, is counterclockwise when facing the discharge side of the fan. Step 4: determine the bushing mount location the b...

  • Page 75

    75 step 7: determine the current blade pitch and the pin location for the new blades table 24 - pin location type bushing mount blade pitch angle 20° 25° 28° 30° 33° 35° 38° 40° 45° 50° 5z a - ret - ret ret ret hub hub hub hub b - hub - hub hub hub ret ret ret ret table 25 - pin groove location type...

  • Page 76: Caution

    76 step 4: remove the fan blades and replace the pitch pins figure 40 - pin groove location figure 41 - pitch pin location figure 42 - example pitch pin step 5: replace the fan blades with the pitch pin of the blade in the same groove and reassemble the fan. Replace the blades and assemble the fan m...

  • Page 77: Caution

    77 unit being charged must be at or near full load conditions before adjusting the charge. Before charging units equipped with hot gas reheat must be charged with the hot gas reheat valves closed while the unit is in cooling mode to get the proper charge. After charging, unit should be operated in r...

  • Page 78: Caution

    78 table 26 - acceptable refrigeration circuit values air-cooled cond./air-air heat pump sub-cooling 12-18°f sub-cooling with hot gas reheat 15-22°f superheat 8-15°f water-cooled cond./water source heat pump sub-cooling 4-8°f superheat 8-15°f the system is overcharged if the sub-cooling temperature ...

  • Page 79

    79 table 27 - r-410a and r-22 refrigerant temperature-pressure chart psig psig psig psig psig ( °f) r-410a r-22 (°f) r-410a r-22 (°f) r-410a r-22 (°f) r-410a r-22 (°f) r-410a r-22 20 78.3 43.1 50 142.2 84.1 80 234.9 143.6 110 364.1 226.4 140 540.1 337.4 21 80.0 44.2 51 144.8 85.7 81 238.6 146.0 111 ...

  • Page 80

    80 gas heater instructions figure 43 - gas heater instructions.

  • Page 81

    81 condenser fan electronically commutated motor (ecm) startup the fan cycling option uses a fan cycle switch to switch between one of the discrete speed inputs (see table 28) on the motor thus cycling between two preset speeds based upon discharge pressure of the unit. By connecting 24vac to a sing...

  • Page 82

    82 vfd controlled condenser fan startup with customer provided unit controls the vfd’s are factory provided and factory programmed. Vfd’s receives input from pressure transducers on each refrigerant circuit and vary the fan speed based on the pressure inputs to maintain a discharge (head) pressure. ...

  • Page 83: Operation

    83 operation unit operations should be controlled with thermostat, or unit controller, never at the main power supply, except for servicing, emergency, or complete shutdown of the unit. Thermostat operation thermostat system switch - "heat" heating thermostat fan switch - "auto" or "on" thermostat t...

  • Page 84

    84 or by an auxiliary limit mounted in the supply fan compartment. Electric heating operation when a call for heating (g and w1, w2, etc.) is made the supply blower motors and electric resistance heaters will energize. Heating is accomplished by passing electrical current through a specified amount ...

  • 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. Gas heating make sure all gas supply lines have been purged of air before ...

  • Page 86: Danger

    86 if induced draft blower/motor assembly has to be replaced, care must be taken to provide an airtight seal between the blower housing and the burner box. Gas heat exchanger removal removal disconnect all wiring on the heat exchanger. Disconnect flex gas lines and pull out of the way. Remove screws...

  • Page 87: Warning

    87 removal take off the fan grill by removing the screws that attach it to the orifice. The condenser fan motor wires can then be accessed and disconnected. Remove the screws that attach the orifice to the condenser assembly. The screws are located on the top of the orifice around the perimeter, and...

  • Page 88: Warning

    88 evaporator coil (6-25 and 30 ton) removal evacuate refrigerant from the systems. Remove the txv bulbs from the suction lines. Disconnect the suction and liquid line copper connections to the evaporator coil. Figure 46 - evaporator coil access remove the screws attaching the filter rack to the eva...

  • Page 89: Caution

    89 must be rinsed with clean water. A solution of 1-2% sodium hydroxide (naoh) or sodium bicarbonate (nahco) before the last rinse ensures that all acid is neutralized. E-coated coil cleaning documented routine cleaning of e-coated coils is required to maintain coating warranty coverage for fin and ...

  • Page 90: Caution

    90 recommended coil cleaner the following cleaning agent, assuming it is used in accordance with the manufacturer’s directions on the container for proper mixing and cleaning, has been approved for use on e-coated coils to remove mold, mildew, dust, soot, greasy residue, lint, and other particulate:...

  • Page 91: Caution

    91 supply fans lubrication all original fan motors and bearings are furnished with factory lubrication. Some applications will require that bearings be re- lubricated periodically. The schedule will depend on the operating duty, temperature variations or other severe atmospheric conditions. Bearings...

  • Page 92

    92 used to help accomplish this. Use the pry slots on the back side of the motor mount. Pull the motor mount to the edge of the blower frame at the opening. Remove the motor mount with the motor and blower wheel attached. Large motors will require more than one person. Care must be taken not to dama...

  • Page 93: Warning

    93 phase loss led = green 5. On/off led = green phase loss led = green 1. On/off led = alternating green/red powering up with no voltage present: phase loss led = out 1. On/off led = green going into trip condition after operating conditions were good: phase loss led = green 2. On/off led = green fl...

  • Page 94: Warning

    94 signal of the system. The following table shows the linear relationship between the demand signal and compressor capacity modulation. The compressor controller protects the compressor against high discharge temperature. Refer to appendix b for the relationship between thermistor temperature readi...

  • Page 95

    95 table 30 - 6-8 and 10 ton pre filters feature 6a quantity / size type 0 no pre filters a 4 / 16” x 20” x 2” pleated, 30% eff, merv 8 b 2 / 16” x 20” x 1” metal mesh, outside air c 2 / 40” x 16” x 5/16” lint screen with rab, feature a2 = q, r 2 / 40” x 16” x 5/16” table 31 - 9 and 11-15 ton pre fi...

  • Page 96

    96 table 34 - 50, 60, and 70 ton pre filters feature 6a quantity / size type 0 no pre filters a 24 / 12” x 24” x 2” pleated, 30% eff, merv 8 b 6 / 16” x 25” x 1” metal mesh, outside air with pe or pr, feature 1a = b, c 4 / 16” x 25” x 1” c 12 / 47” x 12” x 5/16” lint screen table 35 - 55, 65, and 75...

  • Page 97

    97 table 37 - 26, 31-50, 60, and 70 ton preheat filters feature quantity / size type 14a 14b a, b, c, d a, b, c, d, e, f 6 / 16” x 25” x 1” metal mesh, outside air with pe or pr, feature 1a = b, c 4 / 16” x 25” x 1” table 38 - 6-8 and 10 ton unit filters feature 6b quantity / size type 0 4 / 16” x 2...

  • Page 98

    98 table 40 - 13 and 15 ton unit filters feature 6b quantity / size type 0 4 / 20” x 25” x 2” pleated, 30% eff, merv 8 with rab, feature a2 = q, r 6 / 12” x 24” x 2” b 4 / 20” x 25” x 4” pleated, 30% eff, merv 8 with rab, feature a2 = q, r 6 / 12” x 24” x 4” c 4 / 20” x 25” x 2” permanent filter fra...

  • Page 99

    99 table 42 - 26, 31, and 40 ton unit filters feature 6b quantity / size type 0 8 / 24” x 24” x 2” pleated, 30% eff, merv 8 with rab, feature a2 = q, r 16 / 12” x 24” x 2” b 8 / 24” x 24” x 4” pleated, 30% eff, merv 8 with rab, feature a2 = q, r 16 / 12” x 24” x 4” c 8 / 24” x 24” x 2” permanent fil...

  • Page 100

    100 table 45 - 90-140 ton unit filters feature 6b quantity / size type 0 35 / 18” x 20” x 2” pleated, 30% eff, merv 8 b 21 / 20” x 24” x 4” & 7 / 16” x 20” x 4” pleated, 30% eff, merv 8 c 35 / 18” x 20” x 2” permanent filter frame - replaceable media f 21 / 20” x 24” x 4” & 7 / 16” x 20” x 4” pleate...

  • Page 101

    101 table 49 - 26, 31-50, 60, and 70 ton energy recovery wheel filters feature 1a quantity / size type f, g, h, j, q, r, s, t, u, v, w, y, z, 1, 2, 3 4 / 24” x 24” x 4” pleated, 30% eff, merv 8 with energy recovery wheel exhaust air filters, feature 6a - d, f, g oa - 4 / 24” x 24” x 2” ea - 8 / 16” ...

  • Page 102

    102 55, 65, and 75 ton units, 2” filters 55, 65, and 75 ton units, 4” filters 90-140 ton units, 2” filters 90-140 ton units, 4” filters figure 53 - rn series 55, 65, 70-140 ton standard filter layouts all dimensions are in inches and are height x length. Layouts are viewed from the upstream side of ...

  • Page 103

    103 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 104

    104 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 + ...

  • Page 105

    105 appendix b - thermistor temperature vs. Resistance values deg c deg f resistance (kohms) -40 -40 2889.6 -35 -31 2087.22 -30 -22 1522.20 -25 -13 1121.44 -20 -4 834.72 -15 5 627.28 -10 14 475.74 -5 23 363.99 0 32 280.82 5 41 218.41 10 50 171.17 15 59 135.14 20 68 107.44 25 77 86.00 30 86 69.28 35 ...

  • Page 106: Rn Series Startup Form

    106 rn series startup form date:______________ job name:_____________________________________________________________________ address:______________________________________________________________________ ______________________________________________________________________________ model number:___...

  • Page 107

    107 energy recovery wheel assembly wheel(s) spin freely check rotation fla____________ number hp l1 l2 l3 1 2 power return/exhaust assembly alignment check rotation nameplate amps________ number hp l1 l2 l3 1 2 outside air/economizer dampers operation check damper actuator type: economizer changeove...

  • Page 108

    108 refrigeration system 1 – cooling mode pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/a refrigeration system 2 – cooling mode pressure saturated temperature line temperature sub-cooling superheat discharge n/a n/a suction n/a liquid n/...

  • Page 109

    109 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 110: Maintenance Log

    110 electric preheating limit lockout aux. Limit lockout outside air temperature setpoint ________°f preheat leaving air temperature setpoint ________°f stage amps stage amps 1 5 2 6 3 7 4 8 maintenance log this log must be kept with the unit. It is the responsibility of the owner and/or maintenance...

  • Page 111: Literature Change History

    111 literature change history may 2007 update of iom unit service clearances. Length of front and back clearances from 60” to 48” and length of left and right side clearances from 100” each to interchangeable 48” and 70”. (note: units with hydronic heat must have 70” right side access for service.) ...

  • Page 112

    112 april 2011 updated the condenser water connection sizes in table i12 and added table i13 – smo 254 brazed plate heat exchanger water connections. June 2011 updated 2” pleated 30% efficiency filters from merv 7 to merv 8. March 2012 updated manual to include 55, 65 and 75-140 unit sizes. Instruct...

  • Page 116

    Aaon 2425 south yukon ave. Tulsa, ok 74107-2728 phone: 918-583-2266 fax: 918-583-6094 www.Aaon.Com rn series installation, operation & maintenance r90721 · rev. B · 140725 it is the intent of aaon to provide accurate and current product information. However, in the interest of product improvement, a...