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Gather the required tools and parts before starting installation.
Read and follow the instructions provided with any tools listed
here.
Tools Needed
Torch
¹⁄₄" nut driver
⁵⁄₁₆" nut driver
Adjustable wrench
Heat pump system matches are derived from actual laboratory
testing of matched systems. It is recommended that only
matching equipment be used to ensure proper operation and
efficient performance.
The designed system matches are listed in the heat pump
unit specification sheets. Refrigerant charging instructions
are located on the back of the service access panel.
This heat pump has been factory charged with a quantity of
refrigerant (R-410A) sufficient for a matched indoor coil and a
maximum 15 ft of refrigerant line.
In order to maintain the SEER rating, this heat pump must be
matched with an indoor section containing a variable speed
blower.
Refer to the Thermal Expansion Valve Kits chart to determine
the correct size thermal expansion valve required.
This product has been designed and manufactured to meet
ENERGY STAR
®
criteria for energy efficiency when matched
with appropriate coil components. However, proper refrigerant
charge and proper airflow are critical to achieve rated capacity
and efficiency. Installation of this product should follow the
manufacturer's refrigerant charging and airflow instructions.
Failure to confirm proper charge and airflow may reduce energy
efficiency and shorten equipment life.
This heat pump is designed to be located outdoors with
sufficient clearance for free entrance to the inlet and
discharge air openings. The location must also allow for
adequate service access. See "Minimum Clearances."
Where possible, select a location for the heat pump which is
shaded from the direct rays of the sun most of the time. North
or east locations are usually most desirable. Position the heat
pump to avoid direct contact with water, snow or ice from a
roofline overhead.
The heat pump must be installed on a solid, level mounting
pad that will not settle or shift. Isolate the pad from the
building structure to avoid possible transmission of sound or
vibration from the heat pump into the conditioned space.
2
Tools and Parts
Gauge set for R-410A
refrigerant
Service wrench with hex-
head extension
Torque wrench
System Requirements
Location Requirements
Parts Needed
Check local codes and HVAC supplier. Check existing electrical
supply, and read "Electrical Requirements," "Location
Requirements," "System Requirements" and "Connect
Refrigerant Lines."
A filter dryer approved for use with R-410A refrigerant is
installed in the heat pump.
If this condensing unit is equipped with a crankcase heater, it
should be energized 24 hours before the condensing unit is
started to avoid compressor damage as a result of slugging.
Use only polyol ester oils if oil must be added to the system.
Mineral oil is not compatible with refrigerant.
Indoor System Thermal Expansion Valve
W4GH8 units are designed for use with thermal expansion valve
systems only. The thermal expansion valve must be ordered
separately from the manufacturer.
Thermal Expansion Valve Kits
Model
W4GH824
W4GH836
W4GH848, W4GH860
The heat pump foundation should be raised to a minimum of
3" (7.6 cm) above finish grade. In areas which have prolonged
periods of temperatures below freezing, and/or snowfall, the
heat pump should be elevated above the average snow line.
If heat pump is to be installed on a flat roof, it should be on a
platform or other support which will raise the inlet air opening
12" (30.5 cm) minimum above the surface of the flat roof.
Avoid ice accumulation by ensuring free drainage of
condensate from defrost cycles. The heat pump should be
located away from walkways to avoid possible icing from
defrost condensate.
Avoid placing the heat pump near areas such as sleeping
quarters or study rooms. Normal operating sound levels may
be objectionable if the heat pump is placed near certain
rooms. A shift in sound type does occur during the defrost
mode. The defrost mode generally lasts no longer than
10 minutes.
Part Number
H4TXV01
H4TXV02
H4TXV03
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