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Marvair Wall Mount Heat Pump I&O Manual

11/2021 New

Cooling (Check and Record Readings)

After about 10 minutes of operating in the cooling mode, check and record the following data points.

Inside Temperature (IAT)

ºF

Outside Temperature (OAT)

ºF

Entering Condenser Air Temperature (Should be same temp as OAT)

ºF

Leaving Condenser Air Temperature (Acceptable Range 15º - 20º above OAT)

ºF

Return Air Temperature (RAT) db (Should be same temp as IAT)

ºF

Return Air Temperature (RAT) wb (used to calculate RH% of Return Air)

ºF

Supply Air Temperature (SAT) db (Acceptable Range 15º - 20º below RAT)

ºF

Return Air Temperature (SAT) wb (used to calculate RH% of Supply Air)

ºF

Compressor Amps (L1)

ºF

Compressor Amps (L2)

ºF

Compressor Amps (L3)

ºF

Cooling Stop

Adjust the cooling setpoint to approximately two degrees above the current indoor temperature. The

unit will sequence off, stop cooling.



Did the Compressor stop? .................................................................................................

❒

Yes

❒



Did the Condenser Fan (CFM) stop? ................................................................................

❒

Yes

❒



Did the indoor blower motor (IBM) Stop? .......................................................................

❒

Yes

❒

Electric Reheat Mode

NOTE: If the HVAC system you are testing is not configured with Dehumidification Option, Skip this

section of the Start-up / Commissioning Checklist.



Has the Humidistat Control been installed & wired to the Dehumidification input? .......

❒

Yes

❒



Has the Humidistat Control been properly setup for dehumidification? ..........................

❒

Yes

❒

Adjust the cooling setpoint so there is No demand for cooling. Adjust the Humidity setpoint so there

is No demand for dehumidification. The unit will not be running.

Electric Reheat Start

Adjust the Humidity setpoint to approximately ten percent below the current indoor Humidity

(Humidistat display should indicate current RH%). After the short delay, the unit will sequence on,

start dehumidifying.



Is the indoor blower motor (IBM) On? .............................................................................

❒

Yes

❒



Is the Compressor On? ......................................................................................................

❒

Yes

❒



Is the Condenser Fan (CFM) On? (Ambient conditions may delay CFM) .......................

❒

Yes

❒



Is the Heater On? (Clamp an AmpProbe on one leg of the heater contactor to verify) ....

❒

Yes

❒

Electric Reheat Lock-Out

While the system is still operating in “Dehumidification Mode”. Activate Mechanical Cooling.

Do Not change the Humidity Setpoint on the Humidistat. Simply adjust the cooling setpoint to

approximately four degrees below the current indoor temperature. After the short delay, the unit will

sequence on, start cooling. Notice: system did not turn off. The Only change that occurred is “Heater

turned off”.



Is the indoor blower motor (IBM) On? .............................................................................

❒

Yes

❒



Is the Compressor On? ......................................................................................................

❒

Yes

❒



Is the Condenser Fan (CFM) On? .....................................................................................

❒

Yes

❒



Is the Heater Off? (Clamp an AmpProbe on one leg of the heater contactor to verify) ...

❒

Yes

❒

Содержание MAA1042H

Страница 1: ...is equipped with INSTALLER Affix the instructions on the inside of the building adjacent to the thermostat END USER Retain this manual for future reference Heat Pump Product Manual Vertical Wall Moun...

Страница 2: ...ure to follow these rules may result in death serious bodily harm property damage and damage to the equipment Important Safety Precautions 1 USE CARE when LIFTING or TRANSPORTING equipment 2 TRANSPORT...

Страница 3: ...ve 26 3 4 Ventilation System Set Up 28 Chapter 4 Troubleshooting 4 1 Overview 30 4 2 Failure Symptoms Guide 31 4 3 Compressor Troubleshooting 32 4 4 Electric Heat Control 33 Chapter 5 Electrical Schem...

Страница 4: ...stat Connection Diagram 24 Figure 6 Temperature Sensor Wires Modulating HGR Valve 27 Figure 7 Desired Temperature Set Point Modulating HGR Valve 27 Figure 8 Damper Adjustment 28 Figure 9 Damper Air Pa...

Страница 5: ...requirements For school classrooms models are available to comply with the ASHRAE 62 1999 standard Ventilation for Acceptable Indoor Air Quality Where cooling is required during cool or cold weather...

Страница 6: ...w Ambient CCH EFS W Low Ambient w CCH X Hot Gas Bypass Y Low Ambient w CCH FCC Z Low Ambient w CCH EFS 1 Low Ambient w FCC 2 Low Ambient w FCC EFS 3 CCH w Hot Gas Bypass None Special 17 Indoor Air Qua...

Страница 7: ...on Economizer Base Unit 20 F 131 F 7 C 55 C Economizer Equipped Base Unit 40 F 131 F 29 C 55 C An Optional FCC switch is required for the cooling Mode Heating mode ratings are 47 F Outdoor Temperature...

Страница 8: ...operate during Hydrogen Fault Emergency Ventilation Thermostat must provide the fan G signal to HVAC to activate the indoor blower Forced Mechanical Cooling When 24VAC is applied to the FC input of t...

Страница 9: ...selectable 30 60 or 90 minute delay period Factory set at 60 minutes If the sensor is still calling for defrost at the end of this delay period it will de energize the outdoor fan and energize the re...

Страница 10: ...o the proper operation of the heat pump The control board has four operational modes that can be defined by the installer These modes are selected with jumpers See Figure 1 for location of the jumpers...

Страница 11: ...lso incorporate a fixed hard start time of one second during which the condenser fan motor will turn on full speed for one second at start up High Pressure Switch HPS The high pressure switch is mount...

Страница 12: ...n there is a 24 VAC signal present at the Y terminal W2 The W2 terminal is the electric heat input from the thermostat When the control receives a call for W2 from the thermostat it will energize the...

Страница 13: ...erse acting high pressure switch to cycle the condenser fan motor according to liquid refrigerant pressure conditions Switch closure and fan operation occurs when the pressure reaches 400 PSIG The swi...

Страница 14: ...ator is a motor that modulates the position of the damper blade It is controlled by the enthalpy controller and powered by the 24 VAC control transformer It is capable of driving a full 90 degrees wit...

Страница 15: ...r The mixed air sensor is a thermistor mounted on a bracket adjacent to the right side of the blower assembly The thermistor senses the air temperature entering the structure and provides a signal to...

Страница 16: ...24 hours with primary power turned on 2 Attempt to start the compressor after 24 hours 3 If the compressor will not start makes excessive noise or will not operate return the unit to the freight carri...

Страница 17: ...mum clearances required for proper operation and service Tables 4a 4b below MODEL Min Clearance From the Front Min Clearance Around Sides Single Unit Min Clearance Between Sides Two Units Min Space Ab...

Страница 18: ...1042H 1048H 1060H MAA2042H 2048H 2060H Double Deflection Aluminum Supply Grille 30 x 10 762mm x 254mm 80676 Aluminum Return Grille 30 x 16 762mm x 406mm 80679 Return Filter Grille 30 x 16 762mm x 406m...

Страница 19: ...or the first three feet from the unit The duct must be constructed of galvanized steel with a minimum thickness of 019 Minimum Airflow Requirements WARNING The duct system must be engineered to assure...

Страница 20: ...To provide fresh air remove the two screws on either side of the hood and reposition as desired Figure 3 Fresh Air Hood Damper Adjustment 2 6 Bottom Bracket Installation 1 Remove and discard the 4 x 4...

Страница 21: ...erly aligned with the wall opening Adjust as necessary 5 Note the holes in each side bracket Using the holes for guides drill holes through the wall with a 3 8 inch drill bit Insert the 3 8 bolts or l...

Страница 22: ...liefs CAUTION Note Power supply service must be within allowable range 10 5 of rated voltage stamped on the unit rating plate To operate nominal 230 208V unit at 208V change the transformer line tap f...

Страница 23: ...e unit and reverse L1 L2 at the disconnect 4 Install the ground wire on the ground lug 5 Units designed to operate on 460v have a step down transformer for 230v motors Low Voltage Wiring 1 Pull the lo...

Страница 24: ...24 Marvair Wall Mount Heat Pump I O Manual 11 2021 New Figure 5a Humidity Control Wiring Detail Heat Pumps Figure 5b Thermostat Connection Diagram...

Страница 25: ...owlylowerthethermostatcoolingsetpointtemperature Once the indoor fan turns on allow approximately three minutes for the compressor and outdoor fan to start For units equipped with the low ambient cont...

Страница 26: ...ps with an economizer and optional on all other Marvair units has cycled 3 Move the system switch to the Off position All functions should stop The Blower Timed Delay Relay BTR keeps the blower runnin...

Страница 27: ...F Insert the probes of the meter into the negative black and positive red set point test terminals on the board Carefully and in small increments turn the blue knob on the potentiometer until the vol...

Страница 28: ...the return air from the supply air The difference is the amount of fresh air c Loosen the set screw that holds the collar onto the rod connected to the damper Move the collar and tighten the set screw...

Страница 29: ...ure of the indoor return air Multiply the temperature of the indoor air by B d Calculate what the Tmix should be with the desired quantity of outside air Measure the actual temperature of Tmix at the...

Страница 30: ...fter making this initial inspection The troubleshooting information in this manual is basic The troubleshooting section contains problem solution charts for general problems followed by a compressor s...

Страница 31: ...ation 4 Check air filter s Check blower operation Remove airflow restriction C Unit cycles on high pressure or loss of charge 1 Loss or restriction of airflow 2 Restriction in refrigerant circuit 3 Re...

Страница 32: ...failures before condemning the compressor The following electrical tests will aid diagnosis on single phase units 1 Start Up Voltage Measure the voltage at the compressor contactor during start up Th...

Страница 33: ...the heater assembly the switch will have to be replaced by qualified service personnel after the source of the overheat problem is resolved In addition to the thermal cut out switch described above t...

Страница 34: ...ilable The heater drives liquid refrigerant from the crankcase and prevents loss of lubrication caused be oil dilution Power must be applied to the unit for 24 hours before starting the compressor Not...

Страница 35: ...35 Marvair Wall Mount Heat Pump I O Manual 11 2021 New Figure 11a Typical 1 Electrical Schematic Diagram Heat Pump Models MAA with Manual Outside Air Damper...

Страница 36: ...36 Marvair Wall Mount Heat Pump I O Manual 11 2021 New Figure 11b Typical 208 230v 3 Electrical Schematic Diagram Heat Pump Models MAA...

Страница 37: ...37 Marvair Wall Mount Heat Pump I O Manual 11 2021 New Figure 11c Typical 460v 3 Electrical Schematic Diagram Heat Pumps Models MAA with the PC Control Board...

Страница 38: ...rical components Be sure the unit has dried before restarting Use a fin comb of the correct spacing to straighten mashed or bent fins Outdoor Coil Periodically inspect the outdoor coil and the cabinet...

Страница 39: ...arges 2 Damages caused by shipping accident abuse negligence misuse fire flood or Acts of God 3 Damages caused by operating or staging the unit in a corrosive environment 4 Damages caused by improper...

Страница 40: ...ly outlet duct flange on the unit The 1 25 4 mm clearance must extend on all sides of the supply duct for the first 3 feet 1 meter from the unit IMPORTANT Marvair requires a minimum of 1 25 4 mm from...

Страница 41: ...heaters 6 Install the two No 10 screws in the heater assembly plate 7 Install wire harness in hole provided in drain pan and then through filter bracket and then into control box 8 Wire the heater as...

Страница 42: ...42 Marvair Wall Mount Heat Pump I O Manual 11 2021 New...

Страница 43: ...________________________________________________ Compressor Serial No _ ________________________________________________________ D Pre Start Up Is there shipping damage Yes No If so describe _________...

Страница 44: ...age Voltage L1 L2 L1 L3 L2 L3 3 _______________V Deviation Difference Average Voltage Maximum Deviation ______________V Voltage Imbalance Deviation Difference x 100 Average Voltage ___________ A Volta...

Страница 45: ...g voltage that is Not between the Minimum and Maximum listed on the unit Data Label Must be addressed and corrected before starting unit Improper voltage can cause the compressor to overheat and cause...

Страница 46: ...n installed wired to the Dehumidification input Yes No Has the Humidistat Control been properly setup for dehumidification Yes No Adjust the cooling setpoint so there is No demand for cooling Adjust t...

Страница 47: ...mizer Control Board been properly wired to the Control Yes No Has the Economizer Control Board Ambient selections been properly setup Yes No Has the Economizer Control Board Minimum Opening selection...

Страница 48: ...eating Heat Pump Check and Record Readings After about 10 minutes of operating in the heating mode check and record the following data points Inside Temperature IAT F Outside Temperature OAT F Enterin...

Страница 49: ...door blower motor IBM On Yes No Is the Compressor Off Yes No Is the Condenser Fan CFM Off Yes No Is the Heater On Clamp an AmpProbe on one leg of the heater contactor to verify Yes No Heating Check an...

Страница 50: ...utdoor Thermostat is 0 F to 50 F Is the indoor blower motor IBM On Yes No Is the Compressor On Yes No Is the Condenser Fan CFM On Ambient conditions may be delay CFM Yes No Is the Heater Off Clamp an...

Страница 51: ...__ ____________________________________________________________________________________ ____________________________________________________________________________________ ___________________________...

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