1. DL manuals
  2. AAON
  3. Heat Pump
  4. WH Series
  5. Installation Operation & Maintenance

AAON WH Series Installation Operation & Maintenance

Manual is about: Horizontal Water-Source Heat Pump Unit

Summary of WH Series

  • Page 1

    Wh series horizontal water-source heat pump unit installation, operation & maintenance if the information in this manual is not followed exactly, a fire may result causing property damage, personal injury, or loss of life. Qualified installer improper installation, adjustment, alteration, service, o...

  • Page 2

    2 table of contents aaon wshp series features and options introduction .............................................................. 4 safety .............................................................................................................................................. 5 wshp series ...

  • Page 3

    3 index of tables and figures tables: table 1 - wshp wh series clearances ....................................................................................... 16 table 2 - glycol freezing points ................................................................................................. 23 t...

  • Page 4

    4 aaon wshp features and options introduction energy efficiency • direct drive forward curved supply fan • scroll or rotary compressor • closed cell neoprene foam or 1” foil faced cotton fiber cabinet insulation • waterside economizer with 3-way motorized valve • electronically commutated motors (ec...

  • Page 5: Safety

    5 safety rotation must be checked on all compressors and motors of 3 phase units at startup by a qualified service technician. Scroll compressors are directional and can be damaged if rotated in the wrong direction. Compressor rotation must be checked for proper operation, without using external ref...

  • Page 6: Caution

    6 pvc (polyvinyl chloride) and cpvc (chlorinated polyvinyl chloride) are vulnerable to attack by certain chemicals. Polyolester (poe) oils used with r-410a and other refrigerants, even in trace amounts, in a pvc or cpvc piping system will result in stress cracking of the piping and fittings and comp...

  • Page 7: Warning

    7 grounding required all field installed wiring must be completed by qualified personnel. Field installed wiring must comply with nec/cec, local and state electrical code requirements. Failure to follow code requirements could result in serious injury or death. Provide proper unit ground in accordan...

  • Page 8

    8 1. Read the entire installation, operation and maintenance manual. Other important safety precautions are provided throughout this manual. 2. Startup and service must be performed by a factory trained service technician. 3. The unit is for indoor use only. See general information section for more ...

  • Page 9

    9 wshp series feature string nomenclature unit configuration : accessory options g en m a jo r r ev s ize s eri es m in o r r ev v ol ta ge eff. Le v el c omp l eve l l oop t yp e c o il t y p e h ea t t y p e h ea t s ta g in g 1 2 3a 3b 4 5 6 a 6 b 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 wh a - 024 - c ...

  • Page 10

    10 wshp series feature string nomenclature unit configuration : accessory options g en m aj o r r ev s ize s er ies m in o r re v v o lt ag e e ff . L ev el c o m p l ev el l oo p t y pe c oi l t y p e h eat t yp e h eat s ta g in g 1 2 3 a 3 b 4 5 6a 6b 7 8 9 10 11 12 13 14 15 16 wh a - 024 - c - 0...

  • Page 11: General Information

    11 general information aaon wh series water-source heat pump units (wshp) are designed for indoor installation only. Units are assembled, wired, charged and run-tested at the factory. Certification of cooling models a. Certified as a commercial central air conditioner with electrically operated comp...

  • Page 12: Warning

    12 receiving unit when received, the unit should be checked for damage that might have occurred in transit. If damage is found it should be noted on the carrier’s freight bill. A request for inspection by carrier’s agent should be made in writing at once. All units are shrink-wrapped in blue wrap. I...

  • Page 13: Installation

    13 during the cooling season, if the airflow is reduced due to dirty air filters or any other reason, the cooling coils can get too cold which can cause excessive liquid to return to the compressor. As the liquid concentration builds up, oil is washed out of the compressor, leaving it starved for lu...

  • Page 14: Caution

    14 figure 4 - vibration grommet installation the threaded rod and nut should be adequately sized to support the total unit weight. Care should be taken to avoid installing units directly above or adjacent to sound-sensitive areas. Note: only the required supply and/or return air ducts should be supp...

  • Page 15

    15 draw-through cooling coils will have a negative static pressure in the drain pan area. This will cause an un-trapped drain to back up due to air being pulled up through the condensate drain piping. Condensate drain trapping and piping should conform to all applicable governing codes. Note: the dr...

  • Page 16

    16 table 1 - wshp wh series clearances minimum clearances required capacity front/control panel back (optional) air intake *bottom 006, 009, 012 20 24 6 14 015, 018 20 20 6 20 024, 030 20 20 6 20 036, 042 20 20 6 24 048, 060 20 20 6 24 072, 084 20 24 6 20 *note: if bottom access is not available, op...

  • Page 17

    17 blower assembly removal – side access 1) using a ¼” socket drive, remove the shipping screw on the outside of the right or discharge side of the unit as shown in the figure below. 2) remove the side blower access panel using the panel handle and lift the panel upwards about ½” or until it clears ...

  • Page 18

    18 6) once the blower assembly is clear of the blower panel, turn the blower assembly, 90 degrees, counter clockwise. Caution: at any time, do not rest blower assembly on bottom access panel, as damage may occur to the unit 7) pull the blower assembly out of the unit. Discharge modification the aaon...

  • Page 19: Warning

    19 ensure both the blower panel and side access panels are installed correctly as outlined in the “blower assembly removal – side access” section. Lifting and handling the unit before lifting unit, be sure that all shipping material has been removed from unit. Horizontal unit bottom access several c...

  • Page 20

    20 to do this, grasp both sides of the panel and using a moderate amount of force, pull the compressor side of the panel, approximately 30 degrees, towards the opposite side of the unit. At this point, the end that was just pulled will be low enough to clear the bottom access hole and slide the pane...

  • Page 21

    21 6) once the blower assembly is clear of the blower panel, firmly pull the blower assembly down and away from the unit. Blower motor and fan access to access the blower motor and fan, first remove the blower assembly as outlined in the appropriate “blower assembly removal” for your unit. Once the ...

  • Page 22: Warning

    22 refrigerant-to-water heat exchanger water piping open loop applications this product contains refrigerant-to-water heat exchanger made of cupronickel or copper and is subject to severe corrosion and failure when exposed to chlorides. Do not allow water containing any form of chlorides to enter th...

  • Page 23: Warning

    23 to the equipment as a result of water freezing in the condenser is excluded from coverage under aaon warranties and the heat exchanger manufacturer warranties. Unit is capable of operating with entering water temperatures (ewt) as low as 57°f during cooling mode without the need for an automatic ...

  • Page 24: Warning

    24 water piping only use approved water pipe material. Avoid using galvanized material for water lines/fittings. Table 3 - condenser water connections model (wha-) supply and return connection size (in. Fpt) 006, 009, 012, 015, 018, 024 1/2” 030, 036, 042, & 048 3/4” 060 1” condenser water pump must...

  • Page 25: Warning

    25 of the condenser water must be controlled. All make-up water has minerals in it and as the water is evaporated in the cooling tower, these minerals remain. As the mineral content of the water increases, the conductivity of the water increases. A bleed- off (drain valve) must be provided for the c...

  • Page 26: Caution

    26 electrical supply can enter through the side of the controls compartment where knockouts and/or capped pre-cut holes have been provided. Horizontal units have been provided with both high and low voltage holes at the top and bottom of the unit. Entry must be made into one each of these locations....

  • Page 27: Caution

    27 wire control signals to the unit’s low voltage thermostat connections on the control board, located in the controls compartment. Consult unit wiring diagram for more detailed instructions on control signal wiring connections. If any factory installed wiring must be replaced, use a minimum 105°c t...

  • Page 28

    28 optional 4-sided air filter rack setup the access door handles and filter pull must be set-up prior to installing or changing the filters. Figure 14 - filter access doors filter access door handles set-up 1. Locate the pre-cut aluminum handles in both the bottom and side filter access doors. Figu...

  • Page 29

    29 note: caution should be given not to over bend handles, as this may fracture or break the material. 2. Repeat this process on all access door handles. Filter pull set-up each unit has a filter pull located in the filter section of the unit. 1. A decision must now be made and it is as follows: fig...

  • Page 30

    30 note: caution should be given that filters are clear of access holes so that filter damage does not occur. See figure 20. 5. Because the filter pull may be longer than available room, it may be necessary to roll, bend or cut the slide to be completely removed. 6. Reinstall the filters, taking not...

  • Page 31: Startup

    31 waterside economizer coil condensate drains into evaporator coil drain pan. See the previous section on evaporator coil condensate drain piping. Mineral content of the condenser water must be controlled. All make-up water has minerals in it and as the water is evaporated in the cooling tower, the...

  • Page 32: Caution

    32 figure 23 - wshp series supply fan fan air flow adjustment a specific air volume is delivered by the psc or electronically commutated motors (ecm) fans. Field airflow adjustment may be required at startup. Standard psc and ecm motor options have limited rpm adjustment to adjust airflow. Each moto...

  • Page 33: Caution

    33 before charging unit being charged must be at or near full load conditions before adjusting the charge. 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 34

    34 adjusting sub-cooling and superheat temperatures the system is overcharged if the sub-cooling temperature is too high and the evaporator is fully loaded (low loads on the evaporator result in increased sub-cooling) and the evaporator superheat is within the temperature range as shown in the table...

  • Page 35

    35 table 6 - 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 36: Operation

    36 operation unit operations should be controlled with thermostat and unit controller, never at the main power supply, except for emergency or complete shutdown of the unit. Aaon wshp pioneer silver controller part number: v67470 description the water-source heat pump pioneer silver controller conta...

  • Page 37

    37 pluggable screw terminal block h5 24v = 24vac power output for thermostat. Ns_ov = night setback override input. Input requires 24vac to activate. O = thermostat input for reversing valve operation. Input requires 24vac to activate. Com = 24vac common for thermostat power. G = thermostat input fo...

  • Page 38

    38 figure 24 – pioneer silver controller layout sequences of operation supply fan operation supply fan will enable upon receiving a 24vac input on the “g” terminal or a call for compressor operation unless an alarm prevents the fan from operating. There is a 30 second minimum off timer for the fan. ...

  • Page 39

    39 reversing valve operation the reversing valve will enable if the controller receives a 24vac input on the “o” terminal and the compressor has been operational for a minimum of 5 seconds. The default reversing valve position is for heating operation, no 24vac input on the “o” terminal. Therefore, ...

  • Page 40

    40 table 7 - led diagnostic codes number of led flashes fault 1 high discharge pressure 2 emergency shutdown 3 auxiliary alarm 4 high condensate level alarm 5 low control voltage alarm 6 high control voltage alarm 7 low suction pressure 8 leaving water temperature alarm 9 air coil low temperature al...

  • Page 41

    41 lock out alarms the following alarms will not automatically reset themselves on the fault condition clears. For these alarms to clear one of the following two conditions must be met: 1) controller is power cycled 2) fault condition is corrected and the compressor call is removed emergency shutdow...

  • Page 42

    42 aaon wshp pioneer silver expansion board part number: v75410 description the water-source heat pump pioneer silver expansion board is used in conjunction with the water-source heat pump pioneer silver controller. The expansion board contains a port for communications to the main controller. Note:...

  • Page 43

    43 quick disconnect terminals p1 - not used p2 - 24vac = 24vac power p3 - com = 24vac common p4 - heat 2 enable = 24vac output p5 - com = heat 2 common p6 - heat 1 enable = 24vac output p7 - com = heat 1 common p8 - water temp input = water output temperature sensor (entering water temp). To be used...

  • Page 44

    44 dip switch sw1 simple dehumidification selections pos 9 simple dehum disabled off simple dehum enabled on pos 1 through 8 are not currently used. Dip switch sw2 1. Waterside economizer enable pos 1 wse disabled off wse enabled on 2. Waterside economizer temperature enable setpoint selection pos 2...

  • Page 45

    45 additional sequence of operations supply fan operation the supply fan will enable upon receiving a 24vac input on the “g” terminal or upon a call for compressor operation, unless an alarm prevents the fan from operating. There is a 30 second minimum off timer for the fan. The supply fan is enable...

  • Page 46: Maintenance

    46 hot gas reheat dehumidification for hot gas reheat dehumidification, switch 1, position 9 must be set to “off”. The compressor is enabled at full capacity “y2” when dehumidification mode is enabled. The supply fan low speed and reheat valve “rh” 24vac outputs are enabled. If the unit is equipped ...

  • Page 47: Caution

    47 supply fans supply fan lubrication all original blower 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 condit...

  • Page 48: Caution

    48 #1 simple green simple green is available from aaon parts and supply (part# t10701) and is biodegradable with a neutral 6.5 ph. Recommendation is to use it at a 4 to 1 mix. Use the following procedure. 1. Rinse the coil completely with water. Use a hard spray but be careful not to bend or damage ...

  • Page 49: Filter Information

    49 correctly to give optimal performance over many years. Filter replacement monthly filter inspection is required to maintain optimum unit efficiency. It is strongly recommended that filter media be replaced monthly. See optional 4-sided air filter rack set-up prior to maintenance of the filter rac...

  • Page 50

    50 table 10 – 015, 018, 024, & 030 wh series unit filters (b & c cabinet) feature 3b quantity/size (w x h x d) type 0 16” x 16” x 2” filters must be field installed a (2) 16” x 16” x 2” pleated, 30% eff, merv 8 b (2) 16” x 16” x 4” pleated, 65% eff, merv 11 d pleated, 85% eff, merv 13 e pleated, 95%...

  • Page 51

    51 appendix a - heat exchanger corrosion resistance the resistance guide below provides the corrosion resistance of stainless steel type aisi 316 and pure copper (99.9%) in water, to a number of important chemical factors. The actual corrosion is a very complex process influenced by many different f...

  • Page 52

    52 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 53: Wh/wv Series Startup Form

    53 wh/wv series startup form job name:_______________________________________________ date:______________ address:______________________________________________________________________ ______________________________________________________________________________ model number:_______________________...

  • Page 54

    54 supply fan assembly alignment check rotation nameplate amps________ number hp l1 l2 l3 1 compressors/dx cooling only connect gauges for troubleshooting check rotation number l1 l2 l3 head pressure psig suction pressure psig 1 refrigeration system 1 - cooling mode due to the charge-critical nature...

  • Page 55

    55 water/glycol system 1. Has the entire system been flushed and pressure checked? Yes no 2. Has the entire system been filled with fluid? Yes no 3. Has air been bled from the heat exchangers and piping? Yes no 4. Is the glycol the proper type and concentration (n/a if water)? Yes no 5. Is there a m...

  • Page 56

    Copyright © aaon, all rights reserved throughout the world. Aaon® and aaonaire® are registered trademarks of aaon, inc., tulsa, ok. Aaon 2425 south yukon ave. Tulsa, ok 74107-2728 www.Aaon.Com wshp series installation, operation & maintenance v81280 · rev. A · 170308 factory technical support: 918-3...