Ductwork And Filter - International comfort products C9MVX Installation Instructions Manual

Electrical Connections
Figure 34
NOTE: Junction Box can be mounted to either the left or right side.
115V. 60 Hz.
W
BK
G
Connection
Box
Ground
R
LowVoltage
C
TerminalBoard
W2
W1
Y/Y2
G
W
G
R
SingleStage
Thermostat
R
LowVoltage
C
TerminalBoard
W2
W1
Y/Y2
G
W2
TwoStage
W1
R
Thermostat
G
NOTE:115VAC/60Hz/single−−phase
Operatingvoltagerange*:127VACmax,104VACmin.
* Permissible limits of voltage at which unit will operate satisfactorily
Furnace Control Fuse
The 24V circuit contains a 5−amp, automotive−type fuse located
on furnace control board. (See Figure 35) Any electrical shorts of
24V wiring during installation, service, or maintenance may cause
fuse to blow. If fuse replacement is required, use only a fuse of
identical size (5 amp.)

Ductwork and Filter

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to properly seal duct could result in
personal injury or death.
Do NOT draw return air from inside a closet or
utility room. Return air duct MUST be sealed to
furnace casing.
Installation
NOTE: Design and install the air distribution system to comply with
Air Conditioning Contractors of America manuals and/or NFPA
pamphlets 90A and 90B or other approved methods that conform
to local codes and good trade practices.
1. When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct
outside furnace space.
2. Install air conditioning cooling coil (evaporator) on outlet
side of furnace.
3. For furnaces installed without a cooling coil, it is
recommended that the outlet duct be provided with a
440 01 2024 04
Tap Select Interface Board (*9MPV, *9MVX)
The Tap Select Interface Board is used with the Variable Speed
motor. There are DIP switches (SW2) for continuous blower adjust,
heating blower adjust, cooling blower adjust and cooling on/off
delay profiles. There is a jumper (J1) for slight blower adjustment,
increase (+)/no change (NOM)/decrease (−). There is a jumper
(J2) for airflow selection of Heat Pump EFFICIENCY or
COMFORT. (EFFICIENCY provides no airflow reduction in airflow
whether O is energized or not. COMFORT provides a 10%
reduction in airflow when O is not energized with a cooling call).
The O terminal is available for use for Heat Pump applications, if
desired.
The Y1 terminal (if a two−stage Air Conditioner or two−stage Heat
Pump is used) will provide low cooling blower speed when
energized. (Only Y/Y2 on the furnace control board is used if a
single−stage Air Conditioner or Heat Pump is installed)
Figure 35
Dip Switch
See "Wiring
Diagram"
for switch settings
24 VAC
HUM
25−24−78a
25−24−74
removable access panel. This panel should be accessible
when the furnace is installed so the exterior of the heat
exchanger can be viewed for inspections. The access panel
MUST be sealed to prevent leaks.
4. If separate evaporator and blower units are used, install
good sealing dampers for air flow control. Chilled air going
through the furnace could cause condensation and shorten
the furnace life.
NOTE: Dampers (field supplied) can be either automatic or
manual. Manually operated dampers MUST be equipped with a
means to prevent furnace or air conditioning operation unless
damper is in the full heat or cool position.
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
Cool air passing over heat exchanger can cause
condensate to form resulting in heat exchanger
failure.
Specifications are subject to change without notice.
Control Connections
FUSE
DEHUM
WARNING
Diagnostic Light
115
VAC
HUM
EAC
39