Electrical Wiring; Optional Equipment - International comfort products C9MPX Installation Instructions Manual

Electrical Wiring

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in
personal injury or death.
Turn OFF electrical power at fuse box or service
panel, lockout and tag switch with a suitable
warning label, before making any electrical
connections and ensure a proper ground connec-
tion is made before connecting line voltage.
Power Supply Wiring
The furnace MUST be electrically wired and grounded in
accordance with local codes, or in the absence of local codes with
the latest edition of The National Electric Code, ANSI NFPA 70
and/or The Canadian Electric Code CSA C22.1.
The power supply to the furnace connections must be between
104 VAC and 127 VAC during furnace operation for acceptable
performance.
Field wiring connections must be made inside the furnace
connection box. A suitable strain relief should be used at the point
the wires exit the furnace casing.
Copper conductors shall be used. Line voltage wires should
conform to temperature limitation of 63° F (35° C) rise and be sized
for the unit maximum amps stated on the rating plate. Add the full
load amps for potential field−installed accessories such as
electronic air cleaners and humidifiers that would receive power
from the furnace control. The furnace control is rated for a
maximum of 1.0 amp combined for EAC and HUM. Consult NEC
or local codes for proper wire and circuit sizing.
NOTE: Furnace will not have normal operation if line polarity is
reversed. Check ALL field and control connections prior to
operation.
Junction Box (J-Box) Relocation
The J−box is installed on left side of casing. An alternate j−box
location on right side can be used.
1. Remove bag containing two hole plugs and two self tapping
screws from loose parts bag in blower compartment.
2. Remove two screws holding J−Box to casing.
3. Move large hole plug from right to left J−Box location.
4. Clip wire tie holding J−Box wires.
5. Move J−Box to alternate location and attach using two self
tapping screws from bag.
6. Apply two hole plugs from bag at left J−Box location.
Thermostat
Thermostat location has an important effect on the operation of the
unit. Follow instructions included with thermostat for correct
mounting and wiring.
Low voltage connections to furnace must be made on terminal
board of furnace control.
When using a nonelectronic thermostat, the thermostat heat
anticipator must be set to match the amp draw of the electrical
components in R−W circuit. Accurate amp draw readings can be
obtained at thermostat subbase terminals R and W. For an
electronic thermostat, set cycle rate for 3 cycles per hour.
Measure heat anticipator current in series from R to W at the
thermostat. If 24VAC humidifier is wired up to control, humidifier
must be energized. Allow furnace to operate for two minutes
440 01 1051 02
before recording the AC amperage reading. Set anticipator on
thermostat to recorded value.

Optional Equipment

All wiring from furnace to optional equipment MUST conform to
local codes or, in the absence of local codes with the latest edition
of The National Electric Code, ANSI NFPA 70 and/or The
Canadian Electric Code CSA C22.1. Install wiring in accordance
with manufacturer's instructions. The wiring MUST have a
minimum temperature rating of 105° C.
Humidifier/Electronic Air Cleaner
The furnace is wired for humidifier and/or electronic air cleaner
connection.
REDUCED FURNACE LIFE HAZARD
Failure to follow caution may result in reduced
furnace life.
Do NOT exceed 115V/1.0 amp. maximum current
load for both the EAC terminal and the HUM
terminal combined.
Furnace Control
The furnace control is preset at the factory with a fixed blower ON
delay of 30 seconds in the heating mode. The blower OFF timing is
preset at 140 seconds. If desired, the fan OFF delay can be reset to
obtain the longest delay times while still maintaining comfort
levels. See "Furnace Wiring Diagram" .
Specifications are subject to change without notice.
CAUTION
!
HUMIDIFIER − The HUM (115) is energized when the pressure
switch closes on a call for heat. The HUM is energized when
the inducer is energized.
ELECTRONIC AIR CLEANER − EAC is energized when there
is a blower speed call, except is NOT energized when blower
operates in the hard−wired continuous fan mode.
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