272313-UIM-A-0407
Unitary Products Group
25
ADJUSTMENT OF TEMPERATURE RISE
The temperature rise, or temperature difference between the return air
and the heated supply air from the furnace, must be within the range
shown on the furnace rating plate and within the application limitations
shown in Table 7.
After about 20 minutes of operation, determine the furnace temperature
rise. Take readings of both the return air and the heated air in the ducts,
about six feet (1.83 m) from the furnace where they will not be affected
by radiant heat. Increase the blower speed to decrease the temperature
rise; decrease the blower speed to increase the rise.
All direct-drive blowers have multi-speed motors. The blower motor
speed taps are located in the control box in the blower compartment.
Refer to Figure 26, and the unit-wiring label to change the blower
speed. To use the same speed tap for heating and cooling, the heat ter-
minal and cool terminal must be connected using a jumper wire and
connected to the desired motor lead. Place all unused motor leads on
Park terminals. Two are provided.
ADJUSTMENT OF FAN CONTROL SETTINGS
This furnace is equipped with a time-on/time-off heating fan control. The
fan on delay is fixed at 30 seconds. The fan off delay has 4 settings (60,
90, 120 and 180 seconds). The fan off delay is factory set to 120 sec-
onds. The fan-off setting must be long enough to adequately cool the
furnace, but not so long that cold air is blown into the heated space. The
fan-off timing may be adjusted by positioning the jumper on two of the
four pins as shown in Figure 26.
The furnace control board also allows user selection of the blower
speed that is energized during continuous fan operation. Place jumper
on the HI COOL, LO COOL, or HEAT pins.
WITH BURNER BOX COVER IN PLACE
WITH BURNER BOX COVER REMOVED
FIGURE 25:
Reading Gas Pressure
6
5
4
3
2
1
0
1
2
3
4
5
6
BURNER BOX
WITH COVER
OUTLET
PRESSURE
TAP
GAS VALVE
U-TUBE
MANOMETER
TEE
FITTING
BURNER BOX
PRESSURE
REFERENCE
HOSE
3.5 IN
WATER
COLUMN
GAS PRESSURE
SHOWN
6
5
4
3
2
1
0
1
2
3
4
5
6
U-TUBE
MANOMETER
3.5 IN
WATER
COLUMN
GAS PRESSURE
SHOWN
BURNER BOX
WITH COVER
REMOVED
OUTLET
PRESSURE
TAP
GAS VALVE
BURNER BOX
PRESSURE
REFERENCE
HOSE
(not used)
The temperature rise, or temperature difference between the return
air and the supply (heated) air from the furnace, must be within the
range shown on the furnace rating plate and within the application
limitations shown in Table 7 “ELECTRICAL AND PERFORMANCE
DATA”.
The supply air temperature cannot exceed the “Maximum Supply
Air Temperature” specified in these instructions and on the fur-
nace rating plate. Under NO circumstances can the furnace be
allowed to operate above the Maximum Supply Air Temperature.
Operating the furnace above the Maximum Supply Air Temperature
will cause premature heat exchanger failure, high levels of Carbon
Monoxide, a fire hazard, personal injury, property damage, and/or
death.
Do not energize more than one motor speed at a time or damage to
the motor will result.
FIGURE 26:
Furnace Control Board
HI COOL
LO HEAT
EAC-H
L1
XFMR
NEUTRALS
HUM
60
90
120
180
BLOWER DELAY
Y/Y2
W2
R
G
C
Y1
LO COOL
REMOTE
SWITCH
FA
N
SPEED
LO
COOL
LO
HEA
T
HI
COOL
W/W1
HI
HEA
T
W2
DELA
Y
OFF
10
MIN
15
MIN
20
MIN
HI HEAT
YELLOW - MED LOW
BLACK - HI
RED - LOW
BLUE - MED HI
CONTINUOUS
FAN SPEED
JUMPER
W1 - W2
DELAY
JUMPER
FAN OFF
ADJUSTMENT
JUMPER
