Gas Input Rate Measurement (Natural Gas Only ); Temperature Rise; Circulator Blower Speeds - Goodman AKSS9/GKS9 Installation Instructions Manual

7. Using a leak detection solution or soap suds, check for leaks
at outlet pressure boss plug (Honeywell valve) or screw (White-
Rodgers valve). Bubbles forming indicate a leak. SHUT OFF
GAS AND REPAIR ALL LEAKS IMMEDIATELY!
8. Measure the gas manifold pressure with burners firing. Adjust
manifold pressure using the Manifold Gas Pressure table
shown below.
Manifold Gas Pressure
Natural Gas
Propane Gas
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 boss.
12. Replace outlet pressure tap:
a. Honeywell VR8215 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 36G22 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!
G I R M
AS NPUT ATE EASUREMENT
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
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:
Installation's gas heating (HTG) value: 1,000 BTU/ft
(Obtained from gas supplier)
Installation's seconds per cubic foot: 34 sec/ ft
Conversion Factor (hours to seconds): 3600 sec/hr
Input = (Htg. value x 3600) ÷ seconds per cubic foot
3
Input = (1,000 BTU/ft x 3600 sec/hr) ÷ 34 sec/ ft
Input = 106,000 BTU/hr
Minor changes to the input rate may be accomplished through mani-
fold pressure adjustments at the gas valve. Refer to Section XIV,
Startup Procedure and Adjustment - Gas Manifold Pressure Measure-
ment and Adjustment for details. NOTE: The final manifold pressure
cannot vary by more than ± 0.3" w.c. from the specified setting. Con-
3.5" w.c.
10.0" w.c.
(N G O )
ATURAL AS NLY
3
) of
3
3
3
sult your local gas supplier if additional input rate adjustment is re-
quired.
5. Turn ON gas to and relight all other appliances turned off in
step 1. Be certain that all appliances are functioning properly
and that all pilot burners are operating.
T R
EMPERATURE ISE
Temperature rise must be within the range specified on the unit
rating plate. An incorrect temperature rise may result in condens-
ing in or overheating of the heat exchanger. An airflow and tem-
perature rise table is provided in the Specification Sheet applicable
to your model. Determine and adjust temperature rise as follows:
1. Operate furnace with burners firing for approximately ten
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.
Temperature Rise Measurement
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 Section XIV, Startup Procedure and Adjustment -Circulator
Blower Speeds for speed changing details.
C B S
IRCULATOR LOWER
T
O PREVENT PREMATURE FAILURE OF HEAT EXCHANGER
,
DAMAGE PERSONAL INJURY OR DEATH
( - ).
CONTROL FACTORY SET
This furnace is equipped with a multi-speed circulator blower. This
blower provides ease in adjusting blower speeds. The Specification
Sheet applicable to your model provides an airflow table, showing the
relationship between airflow (CFM) and external static pressure (E.S.P.),
for the proper selection of heating and cooling speeds. The cooling
blower speed is shipped set on HIGH, and the heating blower speed is
set as indicated in the Specification Sheet applicable to your model.
These blower speeds should be adjusted by the installer to match the
installation requirements so as to provide the correct heating tempera-
ture rise and correct cooling CFM.
30
SUPPLY
AIR
RETURN
AIR
PEEDS
WARNING
,
DO NOT ADJUST THE LIMIT
,
PROPERTY