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INSTALLATION INSTRUCTIONS
A7HP14F
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be
alert to the potential for personal injury or death.
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.
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.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 18 in this
instruction for information.
General
This A7HP14F outdoor heat pump with all-aluminum coil
is designed for use with R-454B refrigerant only. This unit
STEP 1 – SETTING THE UNIT – Clearances
See NOTES
See
NOTES
See NOTES
508425-01
This manual must be left with the homeowner for future reference
WARNING
WARNING
See
NOTES
CONTROL
BOX
must be installed with an approved indoor air handler or
coil. For AHRI Certified system match-ups and expand-
ed ratings, visit www.AlliedAir.com. 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.
more in-depth information, consult the Installation
and Service Procedures manual.
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.
NOTE – This unit A7HP14F is a PARTIAL UNIT AIR CON-
DITIONER, complying with PARTIAL UNIT requirements
of this Standard, and must only be connected to other
units that have been confirmed as complying to corre-
sponding 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.
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. (305
mm) and the final side may be 6 in. (152 mm).
A clearance of 24 in. must be maintained between two units.
48 in. (1219 mm) clearance required on top of unit.
*508425-01*
Issue 2427
Single Stage Heat Pump
NOTICE!
CAUTION
(P) 508425-01
For
Page 1 of 23
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Summary of Contents for Lennox A7HP14F
- Page 1 3. Always keep hands, hair, clothing, jewelry, tools, etc. protective clothing. away from moving parts. NOTE – This unit A7HP14F is a PARTIAL UNIT AIR CON- IMPORTANT: Special procedures are required for clean- DITIONER, complying with PARTIAL UNIT requirements ing the all-aluminum coil in this unit. See page 18 in this of this Standard, and must only be connected to other instruction for information.
- 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 the ignition be used in the searching for or detection of manufacturer. refrigerant leaks.
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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: Unit Dimensions - Inches (Mm)
TAmin Table Charge (lb) 10.0 15.0 20.0 25.0 30.0 Charge (kg) 11.3 13.6 Minimum Conditioned Area (ft2) 149.9 224.9 299.9 374.8 449.8 Minimum Conditioned Area (m2) 13.9 20.9 27.9 34.8 41.8 NOTE – Multiply values in TAmin table by the Altitude Adjustment Factors to correct TAmin based on installed altitude. Altitude Adjustment Factor Altitude (m) 1000... - Page 5 IMPORTANT IMPORTANT This model is designed for use in check / expansion valve This unit must be matched with an indoor coil as systems only. An indoor expansion valve approved for specified with AHRI. For AHRI Certified system match- use with R-454B refrigerant must be ordered separately ups and expanded ratings, visit www.alliedair.com.
- Page 6 NOTE - When installing refrigerant lines longer than 50 NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrica- feet, refer to the Refrigerant Piping Design and Fabrica- tion Guidelines manual available on Alliedair.com (Corp. tion Guidelines manual available on www alliedair.com 9351-L9), or contact the Technical Support Department (Corp.
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Page 7: 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 8 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 9 STEP 2 – 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 10 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 11 This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the A7HP14F Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information. The check 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 check/expansion valve in a manner that will provide access for future field service of the expansion valve.
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Page 12: Step 3 - Leak Test And Evacuation
STEP 3 – 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 13 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...
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Page 14: Electrostatic Discharge
STEP 4 – ELECTRICAL – Circuit Sizing WARNING and Wire Routing Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). -
Page 15: Typical Control Wiring
STEP 4 – ELECTRICAL – (Continued) – High Voltage and Field Control Wiring The following illustration provides an example of control wiring connections when using a standard thermostat. ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING HIGH VOLTAGE / GROUND WIRES Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. - Page 16 Torque Requirements When servicing or repairing heating, ventilating and air conditioning components, ensure the fasteners are appro- priately tightened. Table 2 lists torque values for fasteners. TABLE 2 TORQUE REQUIREMENTS Parts Recommended Torque Service valve cap 8 ft.-lb. 11 NM Sheet-metal screws 16 in.-lb.
- Page 17 Total Charge = Factory Charge + Additional charge. The total charge is marked on the space adjacent to “Total Charge”. See nameplate below. Detailed information is given in the A7HP14F Installation and Service Procedures manual, which is available on AlliedConnect™.
- Page 18 Nominal Defrost Time Selection Input Defrost System (Replaces High Stage Lock-in Temperature Selection In- This section addresses: put) [BE1] • Emergency Heat The nominal defrost time selection input is provided by the position of a selection shunt on the P3 header. If the nom- •...
- Page 19 DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS The state (Off, On, Flashing) of two LEDs on the demand defrost control (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that are described in table 3. TABLE 3 DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS DS1 and DS2 System Status, Fault and Lockout Codes Condition/Code Possible Cause(s)
- Page 20 • Check the indoor unit drain line for obstructions month- Professional Maintenance ly. The indoor coil is equipped with a drain pan to collect condensate formed as your system removes humidity NOTICE ! from the inside air. Have your dealer show you the loca- Failure to follow instructions will cause damage to tion of the drain line and how to check for obstructions.
- Page 21 4 - Inspect the indoor coil drain pans and condensate Decommissioning drains for rust, debris, obstructions, leaks or cracks. Pour water in pans to confirm proper drainage from Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and the pan through to the outlet of the pipe.
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Page 22: Start Up Checks
A7HP14F 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:... - Page 23 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)
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