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INSTALLATION INSTRUCTIONS
A7AC22V
General
This A7AC22V 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 www.alliedair.com.
The A7AC22V 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 A7AC22V 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 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.
215 Metropolitan Drive
West Columbia, SC 29170
508482-01
This manual must be left with the homeowner for future reference
AIR CONDITIONER – R454B
OUTDOOR UNIT
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 clean-
ing the all-aluminum coil in this unit. See page 25 in this
instruction for information.
This unit must be installed with an approved indoor air
handler or coil. For AHRI Certified system match-ups and
expanded ratings, visit www.alliedair.com.
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.
*P508482-01*
Issue 2429
PACKING LIST
WARRANTY
CERTIFICATE
CONNECTORS (2)
WARNING
WARNING
CAUTION
((P) 508482-01
(
RAST 6-PIN
Page 1 of 26
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Related Manuals for Lennox Allied Air Enterprises A7AC22V
Summary of Contents for Lennox Allied Air Enterprises A7AC22V
- Page 1 INSTALLATION INSTRUCTIONS A7AC22V AIR CONDITIONER – R454B This manual must be left with the homeowner for future reference PACKING LIST WARRANTY CERTIFICATE RAST 6-PIN CONNECTORS (2) OUTDOOR UNIT WARNING Improper installation, adjustment, alteration, service General or maintenance can cause property damage, personal This A7AC22V outdoor air conditioner with all-aluminum injury or loss of life.
- Page 2 SETTING THE UNIT – Clearances 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 NOTE – R-454b 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.
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Page 4: Refrigerating System
IMPORTANT IMPORTANT When removing refrigerant from a system, either for In addition to conventional charging procedures, the servicing or decommissioning, it is recommended good following requirements shall be followed. practice that all refrigerants are removed safely. • Ensure that contamination of different refrigerants When transferring refrigerant into cylinders, ensure does not occur when using charging equipment. - 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°...
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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 Flush the existing line set per the following instruc- SETTING THE UNIT (Continued) – tions. For more information, refer to the Installation and Unit Placement Service Procedures manual available on alliedair.com CAUTION - DO NOT attempt to flush and re-use existing NOTICE! line sets or indoor coil when the system contains contam- inants (i.e., compressor burn out).
- Page 8 The A7AC22V is a variable-capacity cooling system uti- • Maximum length vapor riser = 60 feet. lizing variable speed compressor technology. With the • Up to 50 Linear Feet: Use rated line sizes listed in table 1. variable speed compressor and variable pumping capac- •...
- Page 9 TABLE 1. Standard Refrigerant Line Set – Up to 50 Linear Feet Inches (mm) Valve Size Connections Recommended Line Sets Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number A7AC22V* -024 3/8” (10 mm) 3/4” (19 mm) L15-41-20 20 feet (6.1 m) 89J56...
- 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...
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Page 11: Cap And Core Removal
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 gauge set into the valve stem port connection on the liquid service...
- Page 13 REFRIGERANT PIPING – Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the A7AC22V Product Specifications bulletin (EHB) for approved expansion valve kit match-ups and application information.
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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: Evacuate The System
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 WARNING ELECTRICAL – Circuit Sizing 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 or death. Use copper wire only with this product. and the current National Electric Code (NEC).
- Page 17 A7AC22V Thermostat Control Options Qty. of A7AC22V Field Wiring Thermostat Type Indoor Unit Type Wires to Terminal Strip Unit Operation Diagram A7AC22V Connections A3 Communicating Comunicating Gas Fully Communicating Variable Capacity R, I+, I-, C Figure 10 Thermostat Furnace or Air Handler Operation Based Upon Thermostat Demand Conventional 24VAC Any Furnace or Air...
- Page 18 The A7AC22V unit will provide full variable capacity oper- the outdoor unit (R, C, Y1 and Y2). Refer to the A7AC22V ation when installed with a conventional 24VAC non-com- field wiring diagram for a conventional 24VAC non-com- municating two-stage cooling or single-stage cooling municating 2-stage thermostat.
- Page 19 FIGURE 11. Typical Factory Wiring 508482-01 Issue 2429 Page 19 of 26...
- Page 20 FIGURE 12. A7AC22V with A3 Communicating Thermostat – Field Wiring Diagram with RDS Controller 508482-01 Issue 2429 Page 20 of 26...
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Page 21: Single Stage
SINGLE STAGE TWO STAGE FIGURE 13. Conventional 24VAC Cooling Non-Communicating Thermostat Wiring with RDS Controller 508482-01 Issue 2429 Page 21 of 26... -
Page 22: Unit Start-Up
4 - Replace the stem caps and tighten to the value listed Unit Operation in table 2. A7AC22V Unit Operation with a A3 Communicating 5 - Check voltage supply at the disconnect switch. The Thermostat voltage must be within the range listed on the unit’s nameplate. -
Page 23: Operating Angle-Type Service Valve
Using Manifold Gauge Set ACCESS SERVICE PORT When checking the system charge, only use a manifold A service port cap protects the service port core from contamination gauge set that features low loss anti-blow back fittings. and serves as the primary leak seal. Manifold gauge set used with R454B refrigerant systems 1 - Remove service port cap with an appropriately sized wrench. - Page 24 • Check the indoor unit filter each month and replace the Refrigerant Charge per Line Set Length filter, if necessary. OUNCES PER 5 FEET (G PER 1.5 M) ADJUST LIQUID LINE DIA. • Have your Allied dealer show you where your indoor FROM 15 FEET (4.6 M) LINE SET* unit filter is located.
- Page 25 4 - Inspect and clean outdoor coils, if necessary and Professional Maintenance note any damage to coils or signs of leakage. Indoor Unit (Air Handler or Furnace) NOTICE ! 1 - Inspect component wiring for loose, worn or Failure to follow instructions will cause damage to damaged connections.
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Page 26: Start Up Checks
A7AC22V 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: Liquid Pressure: Supply Air Temperature: Ambient Temperature: Return Air: Temperature:...
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