4
Follow the steps below to secure the Heat Pump to the
roof. Refer to Figure 4.
1. Locate the Heat Pump mount gasket over the 14”
to 15” square opening in the roof.
2. Install the ceiling assembly mount frame using the
four bolts found with the ceiling assembly.
3. Proper tension has been achieved for each bolt
when any portion of each gasket indicating tab has
been pulled down even with the roof. See Figure
4. The upper unit has now been properly installed
with optimum gasket compression.
V. ELECTRICAL WIRING
ROUTING 115 VAC WIRING
Following Airxcel’s high voltage wiring specifications
and all local and national electrical codes, route the
roof top unit 115 VAC supply wiring from its power
source to the wirebox. High Voltage Wiring
Specifications based on Minimum Overcurrent
Protection Device Amperage – (see upper unit
nameplate)
1. U.L. requires copper conductors only with minimum
#12 AWG when using the minimum recommended
overcurrent protection device. Higher rated devices or
longer wiring runs will require #10 AWG or greater
copper conductors.
2. To prevent voltage drops greater than 10% during
starting loads, adhere to the following guideline:
For lengths greater than 50’, use #10 AWG or
larger copper conductors. Match to the overcurrent
protection device provided.
Circuit Protection – Refer to upper unit nameplate.
Electrical Wiring High Voltage Wiring
Specification is based on Overcurrent
Protection Device rated higher than the minimum
required (see upper unit nameplate).
Follow all local and NEC (National Electrical Code)
for proper sizing of wire AWG based on
Overcurrent Protection Device selected and the
length of the wiring run to the Heat Pump.
DANGER – SHOCK HAZARD
MAKE SURE THAT ALL POWER SUPPLY TO
THE UNIT IS DISCONNECTED BEFORE
PERFORMING ANY WORK ON THE UNIT TO
AVOID THE POSSIBILITY OF SHOCK INJURY
OR DAMAGE TO THE EQUIPMENT.
DANGER!
WHEN USING NON-METALLIC SHEATH CABLES
(ROMEX, ETC.), STRIP SHEATH BACK TO
EXPOSE 4-6 INCHES OF THE SUPPLY LEADS.
STRIP THE INDIVIDUAL WIRE LEAD ENDS FOR
WIRE CONNECTION (ABOUT 3/4” BARE WIRE).
INSERT THE SUPPLY WIRES INTO THE
ELECTRICAL CONNECTOR CLAMP. SHEATH
MUST PROTRUDE PAST THE CLAMP BUSHING
INSIDE THE BOX AS ILLUSTRATED. MAKE SURE
SHEATH CABLE IS CENTERED IN CLAMP
BEFORE TIGHTENING CLAMP ON SHEATH
CABLE!! DO NOT OVERTIGHTEN!!
THIS COULD RESULT IN PINCHING THROUGH
THE PLASTIC WIRE INSULATION AND CAUSE
SHORTING OR “HOT” WIRES TO GROUND
(SHOCK HAZARD). THE CLAMP IS INTENDED
FOR STRAIN RELIEF OF THE WIRES. SLIGHT
PRESSURE IS USUALLY SUFFICIENT TO
ACCOMPLISH THIS.
IF OTHER THAN NON-METALLIC CABLES ARE
USED FOR SUPPLY CONDUCTORS,
APPROPRIATE STRAIN RELIEF CONNECTORS
OR CLAMPS SHOULD BE USED.
IN NO CASE SHOULD CLAMPING OR PINCHING
ACTION BE APPLIED TO THE INDIVIDUAL SUPPLY
LEADS (NEUTRAL AND “HOT” WIRES).
DANGER – SHOCK HAZARD
TO PREVENT THE POSSIBILITY OF SHOCK
INJURY, THE WHITE WIRE MUST BE CONNECTED
TO NEUTRAL IN THE SERVICE BOX ENTRANCE
AND THE MECHANICAL GROUND LUG MUST BE
CONNECTED TO A GROUNDING LUG EITHER IN
THE SERVICE BOX OR THE MOTOR GENERATOR
COMPARTMENT.
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