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Allied Air 4HP16LT Series Installation And Maintenance Instructions Manual

Allied air enterprises heat pump
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The equipment covered in this manual is to be installed by trained and experienced service
and installation technicians. Improper installation, modification, service, or use can cause
electrical shock, fire, explosion, or other conditions which may cause personal injury, death,
or property damage. Use appropriate safety gear including safety glasses and gloves when
installing this equipment.
Risk of electrical shock. Disconnect all remote
power supplies before installing or servicing
any portion of the system. Failure to
disconnect power supplies can result in
property damage, personal injury, or death.
Installation and servicing of air conditioning
equipment can be hazardous due to internal
refrigerant pressure and live electrical
components. Only trained and qualified service
personnel should install or service this
equipment. Installation and service performed
by unqualified persons can result in property
damage, personal injury, or death.
Sharp metal edges can cause injury. When
installing the unit, use care to avoid sharp
4HP16LT Series
Split System Heat Pump
Save these instructions for future reference
Issue 1004
INSTALLATION ...................................... 2
CONNECTION DIAGRAM ..................... 4
START-UP ............................................ 13
OPERATION ........................................ 18
MAINTENANCE ................................... 23
Manufactured By
Allied Air Enterprises, Inc.
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
Page 1



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  Summary of Contents for Allied Air 4HP16LT Series

  • Page 1 INSTALLATION ... 2 CONNECTION DIAGRAM ... 4 START-UP ... 13 OPERATION ... 18 MAINTENANCE ... 23 Issue 1004 TABLE OF CONTENTS Manufactured By Allied Air Enterprises, Inc. A Lennox International Inc. Company 215 Metropolitan Drive West Columbia, SC 29170 *506468-01* Page 1...
  • Page 2: Installation Clearances

    Electrical Code (U.S.) or Canadian Electrical Code (Canada). Compliance should be determined prior to installation. 4HP16LT condensing units use R410A which is an ozone-friendly HFC refrigerant. This unit must be installed with a matching indoor coil and line set. A filter drier approved for use with 410A is installed in the unit.
  • Page 3: Slab Mounting

    Incorrect or irresponsible use of refrigerant can result in personal injury or death. If the 4HP16LT unit is being installed with a new indoor coil and line set, the refrigerant connections should be made as outlined in this section. If an existing line set and/...
  • Page 4 (RFCI), the liquid line must be replaced prior to the installation of the 4HP16LT unit. Page 4 Field refrigerant piping consists of liquid and suction lines from the outdoor unit (sweat connections) to the indoor coil (flare or sweat connections).
  • Page 5 WARNING Polyol ester (POE) oils used with R410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until ready to make connections. Installing Refrigerant Line During the installation of an air conditioning system, it is important to properly isolate the refrigerant line to prevent...
  • Page 6 Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material or anchored heavy nylon wire ties. Strapping Material (around vapor line only) Tape or Wire Tie Refrigerant Line Sets: Transition from Vertical to Horizontal Anchored Heavy Nylon Wire Tie...
  • Page 7 Refrigerant Line Sets: Installing Vertical Runs (new construction shown) NOTE: Similar installation practices should be used if line set is to be installed on exterior of outside wall. IMPORTANT: Refrigerant lines must not contact structure. Flushing Existing Line Set and Indoor Coil This procedure should not be performed on systems which contain contaminants, such as compressor burn out.
  • Page 8 Use a field-provided fitting to reconnect the lines. 5. Remove the pressure tap valve cores from the 4HP16LT unit’s service valves. Connect an R-22 cylinder with clean refrigerant to the suction service valve. Connect the R-22 gauge set to the liquid line valve and connect a recovery machine with an empty recovery tank to the gauge set.
  • Page 9 11. Install a thermal expansion valve approved for use with R410a refrigerant in the liquid line at the indoor coil. Refrigerant Metering Device 4HP16LT units are designed for use with TXV systems only. An R410a system will not operate properly with an R22 metering device.
  • Page 10 Service Valve Valve Closed Service Port To outdoor coil Service Port Cap Schrader valve open (valve front seated) to line set when valve is closed (front seated) Insert hex wrench here Service Port To outdoor coil Service Port Cap Schrader Valve Figure 10 To Open Liquid or Suction Line Service Valve:...
  • Page 11 to protect the manifold gauge set from damage caused by high pressure.) 2. With both manifold valves closed, connect the cylin- der of R410A refrigerant. Open the valve on the R410A cylinder (vapor only). 3. Open the high pressure side of the manifold to allow R410A into the line set and indoor unit.
  • Page 12 START-UP CAUTION If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1. Rotate fan to check for frozen bearings or binding. 2. Inspect all factory and field-installed wiring for loose connections.
  • Page 13: Cooling Cycle

    DEFROST THERMOSTAT EXPANSION/CHECK VALVE HIGH PRESSURE PRESSURE GAUGE MANIFOLD LIQUID R410A LINE DRUM SERVICE PORT Use gauge ports on suction line valve and liquid line valve for evacuating refrigerant lines and indoor coil. Use suction gauge port to measure suction pressure during charging. •...
  • Page 14: Subcooling Values

    R410A Temperature/Pressure Chart Temp. Pressure Temp. Pressure Psig Psig 100.8 214.0 102.9 217.4 105.0 220.9 107.1 224.4 109.2 228.0 111.4 231.6 113.6 235.3 115.8 239.0 118.0 242.7 120.3 246.5 122.6 250.3 125.0 254.1 127.3 258.0 129.7 262.0 132.2 266.0 134.6 270.0 137.1 274.1...
  • Page 15 Cooling Indoor: 80 db; 67 wb Heating (indoor): 70°F ± 2 psi L - Liquid S- Suction Values provided above are for HSV match pressures; different indoor unit match, and indoor load will cause pressures to vary. due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system.
  • Page 16 5. Subtract the outdoor ambient temperature from the liquid line temperture to determine the approach temperature. ° Liquid Line Temperature °F ° Outdoor Ambient Temperature °F ° Approach Temperature °F 6. Compare the approach value with those shown in Table 8.
  • Page 17 OPERATION Outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is moved to the ON position, the indoor blower operates continuously. Filter Drier The unit is equipped with a large capacity bi-flow filter which keeps the system clean and dry.
  • Page 18 DEFROST BOARD PRESSURE SWITCH CONNECTIONS The unit’s automatic reset pressure switches (LO PS - S87 and HI PS - S4) are factory-wired into the defrost board on the LO-PS and HI-PS terminals, respectively. (OPTIONAL) Low Pressure Switch (LO-PS) — When the low pressure switch trips, the defrost board will cycle off the compressor, and the strike counter in the board will count one strike.
  • Page 19 Defrost Temperature Termination Shunt (Jumper) Pins—The defrost board selections are: 50, 70, 90, and 100°F (10, 21, 32 and 38°C). The shunt termination pin is factory set at 50°F (10°C). If the temperature shunt is not installed, the default termination temperature is 90°F (32°C).
  • Page 20 506468-01 Issue 1004 Page 20...
  • Page 21 Defrost Control Board Diagnostic LEDs 506468-01 Issue 1004 Page 21...
  • Page 22: Interpreting The Diagnostic Leds

    System Diagnostic Module 4HP16LT units contain a diagnostic module for trouble- shooting heat pump system failures. By monitoring and analyzing data from the compressor and thermostat demand, the module can accurately detect the cause of electrical and system related failure without any sensors.
  • Page 23: Vac Power Wiring

    60 seconds. The module will continue to display the previous flash code until the condition returns to normal or 24VAC is removed from the module. TRIP and ALERT LEDs flashing at the same time means control circuit voltage is too low for operation. o l l y l f o l l...
  • Page 24: Thermostat Demand Wiring

    Thermostat Demand Wiring The diagnostic module requires a thermostat demand signal to operate properly. The thermostat demand signal input, labeled Y on the module, should always be con- nected to the compressor contactor coil so that when the coil is energized, the demand signal input is 24VAC. When the coil is not energized, the demand signal input should be less than 0.5VAC.
  • Page 25 MAINTENANCE WARNING Before performing maintenance operations on system, turn the electric power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Electrical shock could cause personal injury or death. Before the start of each heating and cooling season, the following service checks should be performed by a qualified service technician.
  • Page 26: Homeowner Information

    HOMEOWNER INFORMATION In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level. WARNING Turn all electric power to unit OFF at discon- nect switch(es) before performing any mainte- nance operations on system.
  • Page 27 adjustment; turning the unit off and back on before pressures equalize puts stress on unit compressor. Fan Switch In AUTO or INT (intermittent) mode, the blower operates only when the thermostat calls for heating or cooling. This mode is generally preferred when humidity control is a priority.
  • Page 28 Job Name _______________________________ Job Location _____________________________ Installer _________________________________ Unit Model No. ______________ Service Technician ________________________________________ Rated Load Ampacity ________ Maximum Fuse or Circuit Breaker ________________________ Electrical Connections Tight? Indoor Blower RPM _____________ Outdoor Coil Entering Air Temperature _____________ Outdoor Fan Checked? Cooling Liquid Line Pressure __________ Heating...
  • Page 29 Single Stage Wire Diagram 506468-01 Issue 1004 Page 29...
  • Page 30 Two Stage Wire Diagram 506468-01 Issue 1004 Page 30...