27
Installation & Operation Manual
Gas supply
Verify that the appliance is supplied with the type of gas specified
on the rating plate. This appliance is configured for operation
up to 4000 feet altitude. Consult factory for installations above
4000 feet elevation.
Inlet gas pressure:
Measured at the inlet pressure tap on the
appliance gas manifold. The pressure tap is located upstream of
the redundant gas valve and downstream of the field installed
gas cock.
TABLE 3A
INLET GAS PRESSURE
MODEL
NATURAL
LP
Max.
w.c.
Min.
w.c.
Max.
w.c.
Min.
w.c.
500 -1000
14.0
4.0
13.0
11.0
1500 - 2000
14.0
4.0
14.0
8.0
Gas pressure test
1. The appliance must be disconnected from the gas
supply piping system during any pressure testing of that
system at a test pressure in excess of 1/2 PSIG (3.5 kPa).
2. The appliance must be isolated from the gas supply
piping system by closing a manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or less than 1/2 PSIG (3.5 kPa).
3. The appliance and its gas connection must be leak
tested before placing it in operation.
Checking manifold gas pressure
Reference the VF Series Service Manual for information
regarding manifold gas pressure.
Gas connection
Safe operation of the appliance requires properly sized gas
supply piping. See gas line sizing data:
1. Gas pipe size may be larger than appliance connection.
2. Installation of a union at the appliance gas line
connection is required for ease of service and removal of
the gas train.
3. If an additional manual shutoff valve is required by local
codes, install the valve on the outside at the gas supply to the
appliance as shown in FIG. 3-1.
4. A sediment trap (drip leg)
MUST
be provided in the inlet of
the gas connection to the appliance, see FIG. 3-1.
5. Optional gas controls may require routing of bleeds and
vents to the atmosphere, outside the building when
required by local codes.
Maximum inlet gas pressure must not exceed the value specified.
Minimum value listed is for the purposes of input adjustment.
TABLE - 3B
FITTINGS TO EQUIVALENT STRAIGHT PIPE
Diameter Pipe
(inches)
1 1/2
2
3
4
5
Equivalent
length of
Straight Pipe
(feet)
4
5
10
14
20
NOTICE
If an inline high gas pressure regulator is
used, it MUST BE of the lockup type and
be located a minimum of 10 feet from the
appliance. Failure to do so may result in
insufficient gas volume supplied to the
appliance.
3
Gas connections
