26
S
S
S
S
S
T
T
T
T
TA R
A R
A R
A R
A RT
T
T
T
T
-----
U P
U P
U P
U P
U P
P
P
P
P
P
R
R
R
R
R O C E D U R E
O C E D U R E
O C E D U R E
O C E D U R E
O C E D U R E
A N D
A N D
A N D
A N D
A N D
A
A
A
A
A
D J U
D J U
D J U
D J U
D J US T M E N T
S T M E N T
S T M E N T
S T M E N T
S T M E N T
pressure boss plug and seal with a high quality thread
sealer.
b. White-Rodgers 36G54 valve: Turn outlet pressure test
screw in to seal pressure port (clockwise, 7 in-lb minimum).
14. Turn on electrical power and gas supply to the system.
15. Close thermostat contacts “R” and “W1/W2” to energize the
valve.
Using a leak detection solution or soap suds, check for leaks at
outlet pressure boss plug (Honeywell valve) or screw (White-Rodg-
ers valve). Bubbles forming indicate a leak. SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
NOTE:
NOTE:
NOTE:
NOTE:
NOTE: For gas to gas conversion, consult your dealer for
appropriate conversion.
Range
Nom inal
Natural
Low Stage
1.6 - 2.2" w .c.
1.9" w .c.
High Stage
3.2 - 3.8" w .c.
3.5" w .c.
Propane
Low Stage
5.7 - 6.3" w .c.
6.0" w .c.
High Stage
9.7 - 10.3" w .c.
10.0" w .c.
M anifold Gas Pre s s ure
Gas
G
G
G
G
G
AS
AS
AS
AS
AS
I
I I
I
I
NPUT
NPUT
NPUT
NPUT
NPUT
R
R
R
R
R
ATE
ATE
ATE
ATE
ATE
M
M
M
M
M
EASUREMENT
EASUREMENT
EASUREMENT
EASUREMENT
EASUREMENT
(N
(N
(N
(N
(N
ATURAL
ATURAL
ATURAL
ATURAL
ATURAL
G
G
G
G
G
AS
AS
AS
AS
AS
O
O
O
O
O
NLY
NLY
NLY
NLY
NLY
)))))
The gas input rate to the furnace must never be greater than that
specified on the unit rating plate. To measure natural gas input
using the gas meter, use the following procedure.
1. Turn OFF the gas supply to all other gas-burning appliances
except the furnace.
2. While the furnace is operating, time and record one
complete revolution of the smallest gas meter dial.
3. Calculate the number of seconds per cubic foot (sec/ ft
3
) of
gas being delivered to the furnace. If the dial is a one cubic
foot dial, divide the number of seconds recorded in step 2
by one. If the dial is a two cubic foot dial, divide the number
of seconds recorded in step 2 by two.
4. Calculate the furnace input in BTUs per hour (BTU/ hr). Input
equals the installation’s gas heating value multiplied by a
conversion factor (hours to seconds), divided by the number
of seconds per cubic foot. The measured input must not be
greater than the input indicated on the unit rating plate.
EXAMPLE:
EXAMPLE:
EXAMPLE:
EXAMPLE:
EXAMPLE:
Installation’s gas heating (HTG) value: 1,000 BTU/ft
3
(Obtained
from gas supplier)
Installation’s seconds per cubic foot: 34 sec/ ft
3
Conversion Factor (hours to seconds): 3600 sec/hr
Input = (Htg. value x 3600) ÷ seconds per cubic foot
Input = (1,000 BTU/ft
3
x 3600 sec/hr) ÷ 34 sec/ ft
3
Input = 106,000 BTU/hr
This measured input must not be greater than the input
indicated on the unit rating plate.
5. Turn ON gas and relight appliances turned off in step 1. Ensure
all the appliances are functioning properly and that all pilot
burners are operating.
T
T
T
T
T
EMPERATURE
EMPERATURE
EMPERATURE
EMPERATURE
EMPERATURE
R
R
R
R
R
ISE
ISE
ISE
ISE
ISE
Air temperature rise is the temperature difference between supply
and return air. The proper amount of temperature rise is usually
obtained when the unit is operated at the rated input with the “as
shipped” blower speed. If the correct amount of temperature rise is
not obtained, it may be necessary to change the blower speed.
An incorrect temperature rise can cause condensing in or overheat-
ing of the heat exchanger. Determine and adjust the temperature
rise as follows. The temperature rise must be within the range
specified on the rating plate or Specification Sheet applicable to
your model.
(Please contact your distributor or our website for the
applicable Specification Sheet referred to in this manual.)
SUPPLY
AIR
RETURN
AIR
Temperature Rise Measurement
1. Operate furnace with burners firing approximately 15
minutes. Ensure all registers are open and all duct dampers
are in their final (fully or partially open) position.
2. Place thermometers in the return and supply ducts as close
to the furnace as possible. Thermometers must not be
influenced by radiant heat by being able to “see” the heat
exchanger.
3. Subtract the return air temperature from the supply air
temperature to determine the air temperature rise. Allow
adequate time for thermometer readings to stabilize.
4. Adjust temperature rise by adjusting the circulator blower
speed. Increase blower speed to reduce temperature rise.
Decrease blower speed to increase temperature rise. Refer
to the following section for speed changing details.
C
C
C
C
C
IRCULATOR
IRCULATOR
IRCULATOR
IRCULATOR
IRCULATOR
B
B
B
B
B
LOWER
LOWER
LOWER
LOWER
LOWER
S
S
S
S
S
PEED
PEED
PEED
PEED
PEED
A
A
A
A
A
DJUSTMENT
DJUSTMENT
DJUSTMENT
DJUSTMENT
DJUSTMENT
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
TURN
OFF
POWER
TO
THE
FURNACE
BEFORE
CHANGING
SPEED
TAPS
.
WARNING
This furnace is equipped with a PSC circulator blower motor. This
blower provides ease in adjusting blower speeds. Refer to the
Blower Performance Data in the back of the manual for proper
selection of heating and cooling speeds. The cooling blower speed
