Lennox A7HP19V Installation Instructions Manual
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Lennox A7HP19V Installation Instructions Manual

Lennox A7HP19V Installation Instructions Manual

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INSTALLATION INSTRUCTIONS
A7HP19V
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, or service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
IMPORTANT: Special procedures are required for
cleaning the all-aluminum coil in this unit. See page 21 in
this instruction for information.
SETTING THE UNIT – Clearances
508530-01
This manual must be left with the homeowner for future reference
Service clearance of 30 in. (762 mm) must be maintained on one of
the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in (914 mm).
Clearance to one of the remaining two sides may be 12 in. (305mm)
and the final side may be 6 in.(152 mm).
A clearance of 24 in. (610 mm) must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
OUTDOOR UNIT
General
This A7HP19V outdoor air conditioner with all-aluminum
coil is designed for use with R454B refrigerant only. This
unit must be installed with an approved indoor air handler
or coil. For AHRI Certified system match-ups and expanded
ratings, visit AlliedConnect™. The A7HP19V variable
capacity unit may be installed with an S40 communicating
thermostat or a standard 24VAC non-communicating heat
pump thermostat. See field wiring diagrams for wiring
details. These instructions are intended as a general guide
and do not supersede local codes in any way. Consult
authorities having jurisdiction before installation.
Charging information is given on the charging
procedure sticker on the unit access panel. For more
in-depth information, consult the Installation and
Service Procedures manual on www.alliedratings.com
or through the Technical Support department at 1-800-
448-5872.
NOTE – This unit A7HP19V is a PARTIAL UNIT
AIR CONDITIONER, complying with PARTIAL UNIT
requirements of this Standard, and must only be connected
to other units that have been confirmed as complying
to corresponding PARTIAL UNIT requirements of this
Standard, UL 60335-2-40/CSA C22.2 No. 60335-2-40, or
UL 1995/CSA C22.2 No 236.
*P508530-01*
Issue 2438
Heat Pump - R454B
PACKING LIST
WARRANTY
CERTIFICATE
CONNECTORS (2)
NOTICE!
(P) 508530-01
RAST 6-PIN
Page 1 of 31

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  • Page 1 Technical Support department at 1-800- levied for noncompliance. 448-5872. CAUTION NOTE – This unit A7HP19V is a PARTIAL UNIT AIR CONDITIONER, complying with PARTIAL UNIT As with any mechanical equipment, contact with sharp requirements of this Standard, and must only be connected sheet metal edges can result in personal injury.
  • Page 2 WARNING CAUTION • Do not use means to accelerate the defrosting pro- Under no circumstances shall potential sources of cess or to clean, other than those recommended by ignition be used in the searching for or detection of the manufacturer. refrigerant leaks.

  • Page 3: Refrigerating System

    IMPORTANT IMPORTANT When breaking into the refrigerant circuit to make When removing refrigerant from a system, either for repairs – or for any other purpose – conventional servicing or decommissioning, it is recommended good procedures shall be used. However, for flammable practice that all refrigerants are removed safely.

  • Page 4: Step 1 - Setting The Unit

    NOTE – R454B is a A2L refrigerant. The system installation must meet the following parameters based upon total refrigerant charge (line set included). TAmin (Total minimum conditioned area)is the minimum allowable conditioned area based upon the total system charge at sea level. Values must be multiplied by altitude adjustment factor at installed altitude. Qmin table refers to minimum airflow requirements during refrigerant leak mitigation by the refrigerant detection system, based upon total system charge.

  • Page 5: Step 2 - Refrigerant Piping

    (i.e., compressor burn out). BUILDING STRUCTURE Polyvinyl ether (PVE) oil is used in the A7HP19V-024 and -036 compressors. For installations For installations of the A7HP19V-024 and -036 units with refrigerant lines or coils previously charged with R410A and POE oil, Allied...
  • Page 6 Braze-free fittings must conform with UL207 or ISO14903 refrigerant detection sensor is not needed (latest edition). Secondary Sensor Installation The A7HP19V is a variable-capacity cooling system uti- If secondary refrigerant sensor is required, it shall be lizing variable speed compressor technology. With the mounted as follows:...
  • Page 7 • Maximum linear (actual) length = 150 feet. to the vapor riser listed in the table 2 on systems with line sets longer than 51 feet. Use tables 2 and 3 to de- • Maximum linear liquid lift = 60 feet. termine the correct liquid and vapor line sizes.
  • Page 8 Field-fabricated * Applicable to all minor revision numbers unless otherwise specified. ** Some applications may require a field-provided 1-1/8” to 7/8” adapter. TABLE 3. A7HP19V Line Set Guidelines – 51 to 150 Linear Feet in Length Preferred Maximum Vapor Line...

  • Page 9: Installation

    LINE SET IMPORTANT — Refrigerant lines must not contact structure. INSTALLATION REFRIGERANT LINE SET — INSTALLING Line Set Isolation - The following illustrations are VERTICAL RUNS (NEW CONSTRUCTION SHOWN) examples of proper refrigerant line set isolation: NOTE - Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the REFRIGERANT LINE SET —...
  • Page 10 STEP 2 – REFRIGERANT PIPING – (Continued) TYPICAL EXISTING FIXED ORIFICE TYPICAL EXISTING EXPANSION VALVE REMOVAL REMOVAL PROCEDURE PROCEDURE (UNCASED COIL SHOWN) (UNCASED COIL SHOWN) STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK DISTRIBUTOR TUBES (UNCASED COIL ONLY) ORIFICE EXPANSION LIQUID LINE ORIFICE HOUSING HOUSING VALVE...
  • Page 11 REFRIGERANT PIPING – Brazing Procedures CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the vapor and liquid line service of the line.
  • Page 12 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port.
  • Page 13 This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the A7HP19V Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information. The expansion valve unit must be installed inside the cabinet. In applications where an uncased coil is being installed in a field-provided plenum, install the expansion valve in a manner that will provide access for future field service of the expansion valve.

  • Page 14: Leak Test And Evacuation

    LEAK TEST AND EVACUATION LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN R-454B CONNECT GAUGE SET A - Connect the high pressure hose of an R-454B manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port.
  • Page 15 EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve...
  • Page 16 Wire Routing to control the outdoor unit (R, C, W1, O, Y1 and Y2). Re- fer to the A7HP19V field wiring diagram for a conventional In the U.S.A., wiring must conform with current local codes 24VAC non-communicating 2-stage heat pump thermostat.

  • Page 17: Disconnect Switch

    Operation Based Upon Thermostat Demand Conventional 24VAC Any Furnace or Air Full Variable Capacity Operation Controlled 2-Stage Cooling Handler R, C, W1, O, Y1, by A7HP19V Unitary Control Using Suction Figure 14 Thermostat (non-communicating Pressure in the Cooling Mode and Liquid (non-communicating) or communicating)
  • Page 18 Connect conduit to the control box using a proper conduit fitting. Connect the 208/230 high voltage power supply from the disconnect to the A7HP19V contactor as shown. Connect the ground wire from the power supply to the unit ground lug connection.
  • Page 19 PROVIDED RAST 6-PIN CONNECTOR INDOOR CONTROL Indoor Control Single Wire To C Terminal Single Wire To C Terminal Unused Wires Unused Wires FIGURE 14. A7HP19V with A3 Communicating Thermostat – Field Wiring Diagram 508530-01 Issue 2438 Page 19 of 31...
  • Page 20 PUSH BUTTON RAST TERMINALS FOR THERMOSTAT WIRING CONNECTION Y1 cooling demand to the A7HP19V to initiate the Charge Outdoor Control 7 Segment Display and Mode. When using the Charge Mode in the cooling mode, Push Button the “O” must also be provided with a 24V signal to place the reversing valve in the cool position.
  • Page 21 FIGURE 15. Typical Field Wiring 508530-01 Issue 2438 Page 21 of 31...
  • Page 22 FIGURE 16. Typical Factory Wiring 508530-01 Issue 2438 Page 22 of 31...
  • Page 23 Communicating Thermostat with Indoor and Outdoor Units FIGURE 17. A7HP19V with A3 Communicating Thermostat – Field Wiring Diagram with RDS Controller. 508530-01 Issue 2438 Page 23 of 31...
  • Page 24 FIGURE 18. Conventional 24VAC Cooling Non-Communicating Thermostat Wiring with RDS Controller 508530-01 Issue 2438 Page 24 of 31...

  • Page 25: Unit Start-Up

    If the heating or cooling demand remains after The liquid and vapor line service valves are used for re- 20 minutes, the A7HP19V control will begin to ramp up the moving refrigerant, flushing, leak testing, evacuating, compressor capacity until maximum capacity is achieved.
  • Page 26 TABLE 1 – TORQUE REQUIREMENTS OPERATING ANGLE-TYPE SERVICE VALVE Parts Recommended Torque 1 - Remove stem cap with an appropriately sized wrench. Service valve cap 8 ft.-lb. 11 NM 2 - Use a service wrench with a hex-head extension (3/16" for liquid line valve sizes and 5/16"...
  • Page 27 A7HP19V unit is factory-charged with enough R454B re- Charging frigerant to accommodate a 15-foot length of refrigerant piping. For line lengths over 15 feet, add 3 oz of refrigerant Verify the unit is electrically grounded before charging the for every 5 feet of piping beyond 15 feet.
  • Page 28 Homeowner Maintenance IMPORTANT The following maintenance may be performed by the Sprinklers and soaker hoses should not be installed homeowner. where they could cause prolonged exposure to the • Contact a licensed professional HVAC technician to outdoor unit by treated water. Prolonged exposure schedule inspection and maintenance appointments for of the unit to treated water (i.e., sprinkler systems, your equipment before each heating and cooling season.
  • Page 29 3 - Inspect base pan drains for debris and clean as Decommissioning necessary. Before carrying out this procedure, it is essential that the 4 - Inspect the condition of refrigerant piping and technician is completely familiar with the equipment and confirm that pipes are not rubbing copper-to- all its detail.
  • Page 30 R‐454B Refrigerant Pressure‐Temperature Chart Saturated  Saturated  Saturated  Saturated  Saturated  Saturated  Saturated  Saturated  Pressure Pressure Pressure Pressure Liquid  Vapor  Liquid  Vapor  Liquid  Vapor  Liquid  Vapor  (psig) (psig) (psig) (psig) Temp (°F) Temp (°F) Temp (°F) Temp (°F) Temp (°F) Temp (°F) Temp (°F) Temp (°F) ‐58.9 ‐57.1 58.9 61.3 93.0 95.4 113.4 115.6 ‐19.2 ‐17.2...

  • Page 31: Start Up Checks

    A7HP19V Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Rated Load Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure:...

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