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INSTALLATION INSTRUCTIONS
A7CP21V
General
This A7CP21V outdoor heat pump 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 A7CP21V variable capacity unit may be installed with
an A3 communicating thermostat or a standard 24VAC
non-communicating 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.
NOTE – This unit A7CP21V is a PARTIAL UNIT HEAT
PUMP, 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.
NOTE- Carefully transport the unit from the truck to the
installation site using a dolly.
Once at the installation site, the unit can be handled with
or without a dolly to place it at the desired location.
Allied Air Enterprises LLC
215 Metropolitan Drive
West Columbia, SC 29170
508494-01
This manual must be left with the homeowner for future reference
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: Special procedures are required for
cleaning the all-aluminum coil in this unit. See page 27 in
this instruction for information.
To prevent serious injury or death:
1. Lock-out/tag-out before performing maintenance.
2. If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan
belt where applicable, and ensure all controllers
and thermostats are set to the "OFF" position before
performing maintenance.
3. Always keep hands, hair, clothing, jewelry, tools, etc.
away from moving parts.
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.
Maximum Altitude of 10,000 ft. (3,200 m.) above sea
level.
*P508494-01*
Issue 2433
Heat Pump - R454B
WARNING
WARNING
CAUTION
WARNING
(P) 508494-01
Page 1 of 30

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Summary of Contents for Lennox A7CP21V

  • Page 1 Take having jurisdiction before installation. care while handling this equipment and wear gloves and NOTE – This unit A7CP21V is a PARTIAL UNIT HEAT protective clothing. PUMP, complying with PARTIAL UNIT requirements of...
  • Page 2 SETTING THE UNIT – Clearancevvs See NOTES NOTES - 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.
  • Page 3: Refrigerating System

    NOTE – R454B is a A2L refrigerant. The system installation must meet the following parameters based upon total refriger- ant 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 4 IMPORTANT IMPORTANT When removing refrigerant from a system, either for When breaking into the refrigerant circuit to make servicing or decommissioning, it is recommended good repairs – or for any other purpose – conventional practice that all refrigerants are removed safely. procedures shall be used.
  • Page 5 DETAIL A DETAIL B INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM PER 1.5 M]) AWAY INSTALL UNIT AWAY FROM WINDOWS FROM BUILDING STRUCTURE. BUILDING STRUCTURE MOUNTING SLAB TWO 90°...
  • Page 6: Unit Dimensions - Inches (Mm)

    UNIT DIMENSIONS – INCHES (MM) INLET 4 (102) 4 (102) INLET INLET (660) (737) LIQUID LINE 6-1/4 CONNECTION (159) 4 (102) SUCTION LINE CONNECTION INLET 6-1/8 30-1/2 (156) (775) TOP VIEW (102) BOTTOM VIEW BASE SECTION (With Optional Standoff Kit) 39-3/4 (1010) 35-3/4 (908) (depth)
  • Page 7 Procedures manual will void the warranty. make connections. IMPORTANT The A7CP21V is a variable-capacity cooling system uti- Braze-free fittings must conform with UL207 or ISO14903 lizing variable speed compressor technology. With the (latest edition).
  • Page 8 A7CP21V systems. • Up to 50 Linear Feet: Use rated line sizes listed in table 1. COOLING SYSTEM (R454B) • Between 51 and 150 Linear Feet: Crankcase heater and non bleed port TXV factory installed. No additional •...
  • Page 9 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 2. A7CP21V Line Set Guidelines – Between 51 - 150 Feet Linear Length Preferred Maximum Suction Line...
  • Page 10 REFRIGERANT PIPING – Removing Existing Indoor Metering Device 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...
  • Page 11 REFRIGERANT PIPING – Brazing Procedures CAP AND CORE REMOVAL PIPING PANEL REMOVAL / PREPARING LINE SET Remove service cap and core from both the suction / Remove piping panel to access service valves. Cut vapor and liquid line service ports. ends of the refrigerant lines square (free from nicks or dents) and debur the ends.
  • Page 12 alloys and flux. 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 under the valve body to protect the base paint. FLOW NITROGEN WARNING Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE...
  • 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 A7CP21V Product Specifications 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 R454B CONNECT GAUGE SET A - Connect the high pressure hose of an R454B 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: Electrostatic Discharge

    A3 Communicating Thermostat Control WARNING The A7CP21V variable capacity unit may be installed as a Failure to use properly sized wiring and circuit breaker fully communicating system consisting of A3 Smart Com- municating Thermostat, a communicating indoor unit and may result in property damage.
  • Page 17 Indoor Unit Type Wires to Terminal Strip Unit Operation A7CP21V Connections Conventional 24VAC Full Variable Capacity Operation Controlled by A7CP21V Any Furnace or Air 2-Stage Cooling Handler R, C, Y1, Y2 Unitary Control Using Suction Pressure in Cooling Mode Thermostat...
  • Page 18 Charge Mode Pins after providing a Y1 cooling demand to the A7CP21V to initiate the Charge Mode. When using the Charge Mode in the cooling mode, the “O” must also be provided with a 24V signal to place the reversing valve in the cool position.
  • Page 19 RT13 RT36 AMBIENT LIQUID RT61 SENSOR SENSOR SOLENOID COMPRESSOR COMP DISCHARGE CONTROLLER SENSOR A175 S4 HIGH S173 TRANSFORMER RT41 PRESSURE RESISTOR COMPRESSOR TOP SUCTION SWITCH (10K) CAP THERMAL SWITCH REACTOR SENSOR CONTROLLER GROUND INVERTER NOTE- FOR USE WITH COPPER CONDUCTORS ONLY.
  • Page 20 FIGURE 11. Typical Factory Wiring Prior to startup, ensure each temperature sensor is in the correct location. Ensure thermistors clipped on to piping are not loose. Refer to Figure 12. 508494-01 Issue 2433 Page 20 of 30...
  • Page 21 Compressor Suction Temperature Compressor Top Temperature Suction Temperature Coil Temperature Discharge Temperature Crankcase Heater Thermostat Liquid Temperature Sensor Wire Color Coil Temperature Brown Compressor Suction Temperature White Suction Temperature White Discharge Temperature Yellow Crankcase Heater Thermostat Black Ambient Temperature Sensor Black Liquid Temperature Blue...
  • Page 22 Communicating Thermostat with Indoor and Outdoor Units FIGURE 17. A7CP21V with A3 Communicating Thermostat – Field Wiring Diagram with RDS Controller. 508494-01 Issue 2433 Page 22 of 30...
  • Page 23 SINGLE STAGE OPTIONAL N.C. CONDENSATE FLOAT SWITCH 1 Stage Gas Furnace/AHU Thermostat SENSOR #1 SENSOR #2 RDSC Field Kit – 24 Volt Cat # (27A05) TSTAT INDOOR ZONING ALARM NO COM NC NO COM NC Thermostat / Outdoor Unit Terminal Block (BLACK) Indoor Unit Terminal Block (BLUE) R I+ I- DS Terminal wiring is optional for De-Humidification Mode, refer to equipment install Instructions...
  • Page 24: Unit Start-Up

    If not, do not start the equipment until When the A7CP21V unit is installed with a A3 Communi- cating Thermostat and communicating indoor unit, the unit you have consulted with the power company and capacity will be controlled in the variable capacity mode the voltage condition has been corrected.
  • Page 25: Operating Manifold Gauge Set And Service Valves

    OPERATING MANIFOLD GAUGE SET AND SERVICE OPERATING ANGLE-TYPE SERVICE VALVE VALVES 1 - Remove stem cap with an appropriately sized wrench. The liquid and vapor line service valves are used for re- 2 - Use a service wrench with a hex-head extension (3/16" for liquid moving refrigerant, flushing, leak testing, evacuating, line valve sizes and 5/16"...
  • Page 26 Information concerning the outdoor control seven-seg- capacity. ment display and push button operations are available on the unit access panel and in the A7CP21V Installation and Refrigerant Charge per Line Set Length Service Procedures manual. OUNCES PER 5 FEET (G PER 1.5 M) ADJUST LIQUID LINE DIA.
  • Page 27 IMPORTANT High Pressure Switch (S4) This unit is equipped with a high pressure switch which is Sprinklers and soaker hoses should not be installed located on the liquid line. The SPST, normally closed pres- where they could cause prolonged exposure to the sure switch opens when liquid line pressure rises above outdoor unit by treated water.
  • Page 28 Indoor Unit (Air Handler or Furnace) Professional Maintenance 1 - Inspect component wiring for loose, worn or damaged connections. Confirm proper voltage plus NOTICE ! amperage of indoor unit. Failure to follow instructions will cause damage to 2 - Inspect and clean or replace air filters in indoor unit. the unit.
  • Page 29 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 30: Start Up Checks

    A7CP21V Start-Up and Performance Checklist Customer Address Indoor Unit Model Serial Outdoor Unit Model Serial Notes: START UP CHECKS Refrigerant Type: Input Amps: Actual Amps Rated Volts Actual Volts Condenser Fan Full Load Amps Actual Amps: COOLING MODE Suction Pressure:...

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