6
Four (4) wires are required (5 wires for
heat/cool boxes). These wires are as
follows:
(1)
Blue wire for -12 VDC circuit
(1)
Yellow wire for compressor circuit
(1)
Green wire for high fan circuit
(1)
Gray wire for low fan circuit
(1)
White wire for heat circuit
3.
Airxcel, Inc. low voltage wiring specifications:
A.
All low voltage wiring should be 18 gauge
minimum.
B.
Low voltage wiring must be routed into the
front side of the ceiling plenum opening.
ROUTING 115 VAC WIRING
1.
Following Airxcel, Inc. 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, 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.
High Voltage Wiring Specifications 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 air conditioner.
CEILING PLENUM MOUNTING
A.
Mounting (Refer to Figure 1) in Retro-Fit
Application, Remove and Discard the Existing
Insulated Plate and Skip to Step #2 of Item B.
1.
Place the air conditioner over the roof opening.
2.
Position the mount frame into the ceiling opening
(See Figure 1).
3.
Using the four bolts provided, secure the mount
frame to the roof top unit. The four mounting bolts
are to be applied up through the bottom of the mount
frame and into the bottom of the roof top unit (See
Figure 1). Tighten each bolt until the indicators of
the gasket are at roof level.
4.
Route the conduit into the return opening.
B.
Refer to Figure 1
1.
Measure the distance between the ceiling and the
upper unit basepan, add 1/2” to this measurement
and cut the duct divider to this height if necessary.
ALWAYS CUT OFF THE BOTTOM EDGE (THE
EDGE WITHOUT FOAM STRIP).
2.
Carefully wedge this divider between the walls of the
roof opening and up against the upper unit basepan
with the silver side facing forward. Some upper unit
mount gaskets have a locater block on each side to
locate the divider board.
3.
Attach the duct locater plate to the mount frame
using 4 short screws found in the small parts
package.
4.
Apply enclosed wiring diagram to duct divider board.
