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SERVICE AND TECHNICAL SUPPORT MANUAL
Table 4
Blower Speed Taps
COLOR
SPEED
Gray
5
Yellow
4
Blue
3
Orange
2
Red
1
For low−heat, the following connections can be made at LO HT
on control:
S
Orange blower motor lead
S
Red blower motor lead − Factory Setting
(Read following caution before changing taps.)
CAUTION
!
UNIT DAMAGE HAZARD
To avoid operating outside the rise range and avoid
component damage:
Refer to the Air Delivery Tables to determine which airflows
and settings are allowed for proper heating airflow. DO NOT
use the highlighted settings for High−Stage Heating airflow.
The highlighted settings are to be used for Low−Stage
Heating and Cooling ONLY.
Change the blower speed taps as required to maintain proper
temperature rise for Heating and Cooling as described above.
To change blower motor speed selections for heating mode,
remove blower motor lead from control HEAT terminal(s). (See
Figure 4) Select desired blower motor speed lead(s) from the
other motor leads and relocate it/them to LOW or HIGH HEAT
terminal(s). Reconnect original lead on SPARE terminal
Adjust Blower Off Delay (Heat Mode)
If desired, the main blower off time delay period may be
lengthened or shortened when operating in the heating mode
to provide greater comfort. For position and location of switches
on control center. (See Figure 4 and Figure 15)
a. Remove blower door if installed.
b. Turn setup switches SW−2 and SW−3 ON or OFF for
desired blower off delay. See Table 5, Figure 4 and
Figure 15.
c. Proceed to "Set Blower Off Delay" before installing
blower door.
Table 5
DESIRED HEATING MODE
BLOWER OFF DELAY
(SEC.)
90
120
150
180
Adjust Cooling Airflow
The cooling airflow can be set from the remaining blower speed
taps. Refer to the Air Delivery Tables in these instructions.
If a two−stage air conditioning or heat pump is installed, the
Low Cooling Speed is the same speed tap as the Low Heat
(LO HT), as well as Continuous Fan.
440 04 4321 08
FACTORY
ATTACHED TO:
Cool
Spare
HI HT
Spare
LO HT/Cont Fan
Blower Speed Taps
SETUP SWITCH
(SW-2 & SW-3)
POSITION
SW-2
SW-3
OFF
OFF
OFF
ON
ON
OFF
ON
ON
Specifications subject to change without notice.
Adjust Continuous Fan Airflow
The Continuous Fan airflow can be set from the remaining
blower speed taps. Refer to the Air Delivery Tables in these
instructions.
The Continuous Fan speed can be changed to any other
speed tap by toggling th Fan switch at the thermostat. See the
Sequence of Operation for details.
CAUTION
!
FURNACE OVERHEATING HAZARD
Failure to follow this caution may result in reduced furnace
life.
Recheck temperature rise. It must be within limits specified
on the rating plate. Recommended operation is at the
mid−point of rise range or slightly above.
Adjust Thermostat Heat Anticipator
Mechanical thermostat: Set thermostat heat anticipator to
match the amp. draw of the electrical components in the
R-W/W1 circuit. Accurate amp. draw readings can be obtained
at the wires normally connected to thermostat sub-base
terminals, R and W. The thermostat anticipator should NOT be
in the circuit while measuring current. (See Figure 5)
1. Set SW-1 (TT) switch on furnace control board to ON.
(See Figure 4)
2. Remove thermostat from sub-base or from wall.
3. Connect an amp. meter across the R and W sub-base
terminals or R and W wires at wall.
4. Record amp. draw across terminals when furnace is in
low heat and after blower starts.
5. Set heat anticipator on thermostat per thermostat
instructions and install on sub-base or wall.
6. Turn SW-1 (TT) switch OFF.
7. Install blower access door.
Electronic thermostat: Set cycle rate for 3 cycles per hr.
Figure 5
Amp. Draw Check with Ammeter
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
R Y W G
10 TURNS
FROM UNIT 24-V
CONTROL TERMINALS
EXAMPLE: 5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS
Gas Furnace: (F/G)9MXT
HOOK-AROUND
AMMETER
0.5 AMPS FOR THERMOSTAT
=
ANTICIPATOR SETTING
A96316
11
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