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The outdoor unit must be connected to the indoor coil using field supplied refrigerant
grade copper tubing that is internally clean and dry. Units should be installed only with
the tubing sizes for approved system combinations. The refrigerant charge shown in
the nameplate is for standard size interconnecting liquid line lengths up to 15 feet.
Using a larger than specified line size could result in oil return problems. Using a
too small line will result in loss of capacity and other problems caused by insuffi-
cient refrigerant flow. Slope horizontal suction lines at least 1" every 20 feet
toward the outdoor unit to facilitate proper oil return.
3.5 UNIT MOUNTING
If elevating the heat pump, either on a flat roof or on a slab, observe the following guidelines.
1. The base pan provided elevates the heat pump 2" above the base pad.
2 . If elevating a unit on a flat roof , use 4"× 4"(or equivalent) stringers
positioned to distribute unit weight evenly and prevent noise and vibration (See Fig.3).
NOTE:Do not block drain openings shown in Fig.3.
3. If unit must be elevated because of anticipated snow fall, secure unit and
elevating stand such that unit and/or stand will not tip over or fall off.
NOTE: To tie down unit, see 3.6.
BASE PAD
(CONCRETE OR
OTHER SUITABLE
MATERIAL)
Fig.3 RECOMMENDED ELEVATED INSTALLATION
NOTE
BASE PAN (BOTTOM VIEW) DO NOT
OBSTRUCT DRAIN HOLES
(SHADED)
ELEVATION ABOVE ANTICIPATED
SNOW IS NECESSARY
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