Gas Input Rate Measurement; (Natural Gas Only ) - Amana GDH8 Installation Instructions Manual

9. Remove regulator cover screw from the outlet pressure
regulator and turn screw clockwise to increase pressure
or counterclockwise to decrease pressure. Replace
regulator cover screw.
10. Turn OFF all electrical power and gas supply to the
system.
11. Remove the manometer hose from the hose barb fitting
or outlet pressure Tap.
12. Replace outlet pressure tap:
a. Honeywell valve:
Remove the 1/8" NPT hose barb fitting from the outlet
pressure tap. Replace the outlet pressure boss plug
and seal with a high quality thread sealer.
b. White-Rodgers valve: Turn outlet pressure test screw
in to seal pressure port (clockwise, 7 in-lb minimum).
13. Turn ON electrical power and gas supply to the system.
14. Close thermostat contacts to provide a call for heat.
15. Retest for leaks. If bubbles form, SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
M T S
ODELS USING WO TAGE
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING
. O
PLATE NLY MINOR ADJUSTMENTS SHOULD BE MADE BY ADJUSTING
THE GAS VALVE PRESSURE REGULATOR
Only small variations in gas pressure should be made by ad-
justing the gas valve pressure regulator. The manifold pressure
must be measured with the burners operating. To measure
and adjust the manifold pressure, use the following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
a. Honeywell valve: Remove the outlet pressure Tap plug.
Install an 1/8" NPT hose barb fitting into the outlet
pressure tap.
b. White-Rodgers valve: Back outlet pressure test screw
(inlet/outlet pressure
(counterclockwise, not more than one turn).
4. Attach a hose and manometer to the outlet pressure
barb fitting (Honeywell valve) or outlet pressure Tap
(White-Rodgers valve).
5. Turn ON the gas supply.
6. Turn on power and close thermostat "R" and "W1"
contacts to provide a call for low stage heat.
7. Measure the gas manifold pressure with burners firing.
Adjust manifold pressure using the Manifold Gas
Pressure table shown below.
8. Remove regulator cover screw from the low (LO) outlet
pressure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
9. Close thermostat "R" and "W2" contacts to provide a
call for high stage heat.
G V
AS ALVES
CAUTION
,
.
Tap) out one
10. Remove regulator cover screw from the high (HI) outlet
pressure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
11. Turn off all electrical power and gas supply to the system.
12. Remove the manometer hose from the hose barb fitting
or outlet pressure Tap.
13. Replace outlet pressure tap:
a. Honeywell valve: Remove the 1/8" NPT hose barb fitting
from the outlet pressure tap. Replace the outlet
pressure Tap plug and seal with a high quality thread
sealer.
b. White-Rodgers 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 a
t outlet pressure Tap plug (Honeywell valve) or screw (White-
Rodgers valve). Bubbles forming indicate a leak. SHUT OFF
GAS AND REPAIR ALL LEAKS IMMEDIATELY!
NOTE: For gas to gas conversion, consult your dealer for
appropriate conversion.
THE
Natural
Propane
G I R
AS NPUT ATE
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
of gas being delivered to the furnace. If the dial is a one
turn
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:
Installation's gas heating (HTG) value: 1,000 BTU/ft
(Obtained from gas supplier)
29
M anifold Gas Pressure
Gas
Range
Low Stage 1.6 - 2.2" w .c.
High Stage 3.2 - 3.8" w .c.
Low Stage 5.7 - 6.3" w .c.
High Stage 9.7 - 10.3" w .c.
M (N
EASUREMENT ATURAL
Nom inal
1.9" w .c.
3.5" w .c.
6.0" w .c.
10.0" w .c.
G O )
AS NLY
3
)
3