Goodman xCVM97 Series, Руководство по установке

Страница: 42 / 64

42
G
AS
S
UPPLY
P
RESSURE
M
EASUREMENT
Before placing a gas furnace or any gas appliance in operation, verify that
the gas piping, gas fittings and all gas components are safe and free of
leaks by means of an electronic combustible gas indicator and a gas meter
dial test. Combustible gas indicators must be calibrated and verified at
intervals prescribed by the instrument manufacturer.
The line pressure supplied to the gas valve must be within the range specified in
the
Inlet Gas Supply Pressure table. The supply pressure can be measured at the
gas valve inlet pressure tap or at a hose fitting installed in the gas piping drip
leg. The supply pressure must be measured with the burners operating. To
measure the gas supply pressure, use the following procedure:
1. Turn OFF gas to furnace at the manual gas shutoff valve external
to the furnace.
2. Connect a calibrated water manometer (or appropriate gas
pressure gauge) at either the gas valve inlet pressure tap or the
gas piping drip leg. See Honeywell VR9205R gas valve figure for
location of inlet pressure tap.
NOTE: If measuring gas pressure at the drip leg or Honeywell VR9205R
gas valve, a field-supplied hose barb fitting must be installed prior to
making the hose connection.
3. Turn ON the gas supply, check for leaks and operate the furnace
and all other gas consuming appliances on the same gas supply
line.
NOTE: To bring furnace up to High Fire, see instructions for field test
mode in GAS MANIFOLD PRESSURE MEASUREMENT section.
4. Measure furnace gas supply pressure with burners firing. Supply pressure
must be within the range specified in the Inlet Gas Supply Pressure table.
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
Inlet Gas Supply Pressure
If supply pressure differs from table, make the necessary adjustments to pres-
sure regulator, gas piping size, etc., and/or consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve and disconnect
manometer. Reinstall threaded plug before turning on gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in step 3.
G
AS
M
ANIFOLD
P
RESSURE
M
EASUREMENT
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE
,
THE
GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING
PLATE
. G
AS VALVE IS FACTORY SET AND DOES
NOT
REQUIRE ANY
F
IELD ADJUSTMENT
. D
O NOT ATTEMPT TO ADJUST VALVE
.
CAUTION
The manifold pressure must be measured with the burners operating. To measure the manifold pressure, use the following proce-
dure:
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: Remove the outlet pressure tap plug. Install an 1/8" NPT hose barb fitting into the outlet
pressure tap. Refer to gas valve diagram on preceding page.
4. Attach a hose and manometer to the outlet pressure barb fitting.
5. Turn ON the gas supply.
Outlet
Pressure
Tap
1/8 NPT
Figure 49B
Honeywell Model VR9205R Connected to Manometer
Inlet
Pressure
Tap
1/8 NPT
2-PIN
POWER
CONNECTOR
i
Manometer
Manometer
Hose
Open to
Atmosphere
Figure 49A
ATMOSPHERE
PORT
DIRECTION
FLOW
PRESSURE
SWITCH
CONNECTION
Honeywell Model VR9205R
Figure 48