Electrical Wiring; Furnace Control; Optional Equipment - International comfort products N9MP1 Installation Instructions Manual

Electrical Wiring

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this 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
connection 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 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
amps 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.
Heat anticipator setting will need to be measured if 24VAC
humidifier is installed. Measure current in series from R to W at the
thermostat. Be sure 24VAC humidifier is wired up to control. Allow
furnace to operate for two minutes before recording the AC
amperage reading. Set anticipator on thermostat to recorded
value.

Optional Equipment

38
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 this 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.
HUMIDIFIER − The 24V HUM is energized when the pressure
switch closes on a call for heat. The 115V HUM (called HUM on
control) 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.

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" .
Figure 34
NOTE: Junction Box can be
mounted to either the left or right
side.
NOTE: 115 VAC/60Hz/single−phase
Operating voltage range*: 127 VAC max, 104 VAC min.
* Permissible limits of voltage at which unit will operate satisfactorily
Specifications are subject to change without notice
CAUTION
!
Electrical Connections
115V. 60 Hz
W
BK
G
Connec­
tion
Box
Ground
R
Low Voltage
G
Terminal
Board
W
Y
G
W
R G
Models may
O N
O F F
have 1 or 2
pressure
switches
25−24−90−2
440 01 1024 04