Lennox Merit Series 13HPX Units Installation Instructions Manual
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Lennox Merit Series 13HPX Units Installation Instructions Manual

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See also: Instruction and Installation Manual
©2014 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
NOTICE !
For more in-depth information, consult the Installa­
tion and Service Procedures manual, available as
Corp. 0619-L4 on DaveNet or through the Technical
Support department at 800-453-6669.
STEP 1 -- SETTING THE UNIT -- CLEARANCES
See NOTES
See
NOTES
See NOTES
This 13HPX outdoor heat pump is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
13HPX Product Specifications bulletin for approved indoor
component match ups.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
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)
See
NOTES
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.
CONTROL
BOX
48 in. (1219 mm) clearance required on top of unit.
FIGURE 1
Page 1
INSTALLATION
INSTRUCTIONS
Merit
Series 13HPX Units
®
HEAT PUMP
506727-01
3/2014
Supersedes 6/2013
GENERAL
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
HVAC professional installer (or equivalent) or a service
agency.
Litho U.S.A.

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Summary of Contents for Lennox Merit Series 13HPX Units

  • Page 1 This 13HPX outdoor heat pump is designed for use with HOMEOWNER FOR FUTURE REFERENCE HFC-410A refrigerant only. This unit must be installed with an approved indoor air handler or coil. See the Lennox WARNING 13HPX Product Specifications bulletin for approved indoor component match ups.

  • Page 2: Step 1 -- Setting The Unit

    NOTICE ! UNIT DIMENSIONS - INCHES (MM) Roof Damage! This system contains both refrigerant and oil. Some rubber roofing material may absorb oil, causing the rubber to degrade. Failure to follow this notice could result in damage to roof surface. IMPORTANT ! This model is designed for use in check / expansion valve systems only.
  • Page 3 Take care to empty all existing traps. Polyol ester (POE) IMPORTANT ! oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insula­ Some scroll compressors have an internal vacuum tor, preventing proper heat transfer.

  • Page 4: Line Set Installation

    LINE SET INSTALLATION IMPORTANT — Refrigerant lines must not contact structure. 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 5 STEP 2 -- 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...
  • Page 6 STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures CUT AND DEBUR CAP AND CORE REMOVAL 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 suction / vapor and liquid line of the line.
  • Page 7 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 suction / vapor valve stem port.
  • Page 8 STEP 2 -- REFRIGERANT PIPING -- Installing 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 13HPX Product Specifications bulletin (EHB) for approved expansion valve kit match ups. The expansion valve unit can be installed internal or external to the indoor coil.

  • Page 9: Step 3 -- Leak Test And Evacuation

    STEP 3 -- LEAK TEST AND EVACUATION LEAK TEST HIGH MANIFOLD GAUGE SET TO VAPOR SERVICE VALVE (ANGLE OR BALL TYPE) NITROGEN OUTDOOR UNIT HFC-410A CONNECT GAUGE SET A. Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE —...
  • Page 10 STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED) EVACUATION HIGH CONNECT GAUGE SET NOTE — Remove cores from service valves (if not already done). Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve Connect high side of manifold gauge set to liquid line service valve MANIFOLD...

  • Page 11: Install Thermostat

    STEP 4 -- ELECTRICAL -- Circuit Sizing and Wire Routing In the U.S.A., wiring must conform with current local codes and IMPORTANT ! the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current If unit is equipped with a crankcase heater, it should Canadian Electrical Code (CEC).

  • Page 12: Typical Control Wiring

    STEP 4 -- ELECTRICAL (CONTINUED) -- High Voltage and Field Control Wiring The following illustration provide an example of control wiring connections when using 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. To facilitate a conduit, a cutout is located in the bottom of the control panel.
  • Page 13 Torque Requirements OPERATING ANGLE TYPE SERVICE VALVE: When servicing or repairing heating, ventilating, and air conditioning components, ensure the fasteners are 1. Remove stem cap with an appropriately sized wrench. appropriately tightened. Table 3 lists torque values for 2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16”...
  • Page 14 Time Delay CHECKING The timed‐off delay is five minutes long. The delay helps to protect the compressor from short‐cycling in case the power The 13HPX unit is factory-charged with enough HFC-410A to the unit is interrupted or a pressure switch opens. The refrigerant to accommodate a 15-foot length of refrigerant delay is bypassed by placing the timer select jumper across piping.
  • Page 15 Lennox dealer for Normal operation / Simultaneous Slow FLASH assistance. power to control 1. Ask your Lennox dealer to show you where your indoor Anti‐short cycle Alternating Slow FLASH unit's filter is located. It will be either at the indoor unit lockout...

  • Page 16: Start Up Checks

    Heat Pump Operation If power to your unit has been interrupted for several hours Your new Lennox heat pump has several characteristics that or more, set the room thermostat selector to the you should be aware of: EMERGENCY HEAT setting to obtain temporary heat without the risk of serious damage to the heat pump.

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