International comfort products R9MSB Service And Technical Support Manual page 15

FIVE WIRE
THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK BLK
WHT WHT
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
Component Self-Test
NOTE: The furnace control component test allows all
components to run for a short time; except the gas valve
and humidifier terminal HUM are not energized. The EAC-1
terminal is energized when the blower is energized. This
feature helps diagnose a system problem in case of a
component failure. The component test feature will not
operate if any thermostat signal is present at the control and
not until all time delays are completed.
To Begin Component Self-Test:
1. Remove blower access door.
2. Disconnect the thermostat R lead from furnace
control.
3. Manually close blower door switch.
Caution must be taken when manually closing this switch for
service purposes.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, or death.
Blower door switch opens 115−v power to furnace
control. No component operation can occur unless
switch is closed. Exercise caution to avoid electrical
shock from exposed electrical components when
manually closing this switch for service purposes.
4. For approximately 2 sec, short (jumper) the COM-24v
terminal on control to the TEST/TWIN 3/16—in. (5
mm) quick-connect terminal on control until the LED
goes off. Remove jumper from terminals. (See
Figure 2.)
NOTE: If TEST/TWIN and COM-24v terminals are
jumpered longer than 2 sec, LED will flash rapidly and
ignore component test request.
440 04 6601 01
NOTE 2
W C
W
C
R
O
N
T
GND
R G
O
COM
L
NOTE 1
Y
24-V
TERMINAL
BLOCK
NOTES:
FURNACE
Figure 7 − Typical Single−Stage Wiring Diagram
Specifications subject to change without notice.
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
THERMOSTAT
R G Y
TERMINALS
CONDENSING
UNIT
TWO
WIRE
1. Connect Y-terminal in furnace as shown for proper blower operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
Component test sequence is as follows:
a. LED will display previous status code 4 times.
b. Inducer motor starts and continues to run until Step
f of component test sequence.
c. After 7 sec the hot surface igniter is energized for
15 sec., then off.
d. Blower motor operates on HEAT speed for 10 sec.
e. Blower motor operates on COOL speed for 10 sec.
f. Inducer motor stops.
5. Reconnect R lead to furnace control, remove tape
from blower door switch, and re-install blower door.
6. Verify furnace shut down by lowering thermostat
setting below room temperature.
7. Verify that furnace restarts by raising thermostat
setting above room temperature.
Checklist
1. Put away tools and instruments. Clean up debris.
2. Verify that the jumper is removed from the TEST/
TWIN terminal. Verify that there is nothing plugged
into the PLT connector. (Note: If there is a jumper
connector plugged into PLT, remove it and discard.)
(See Figure 2.)
3. Verify that the Blower/Heat Off Delay jumpers are set
as desired. (See Figure 2.)
4. Verify that the blower and control ("Main") doors are
properly installed.
5. Verify that the Status LED glows. If not, check that the
power supply is energized and that the blower door is
secure. (See Figure 5.)
6. Cycle test furnace with room thermostat to be sure
that it operates properly with the room thermostat.
Check all modes including Heat, Cool and Fan.
7. Check operation of accessories per manufacturer's
instructions.
8. Review Owner's Manual with owner.
9. Attach entire literature packet to furnace.
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
A11387
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