CAUTION:
For proper operation, no more than a
30% drop in gas supply pressure from no-load to full-
load conditions is acceptable. Under no
circumstances should the pressure be outside the
listed operational range.
Gas Supply Pressure
A minimum of 4.0 in. WC upstream gas pressure
under full load and a maximum gas supply pressure
setpoint of 10.5 in. WC under load and no-load condi-
tions for natural gas. A minimum of 4.0 in. WC
upstream gas pressure under full load and a maximum
gas supply pressure setpoint of 13.0 in. WC is required
for propane gas. The gas pressure regulator(s) sup-
plied on the heater is for low-pressure service. If
upstream pressure exceeds 1/2 psi at any time, an
intermediate gas pressure regulator, of the lockup
type, must be installed. This regulator should be
placed a minimum distance of 10 times the pipe diam-
eter upstream of the heater gas controls.
When connecting additional gas utilization equipment
to the gas piping system, the existing piping must be
checked to determine if it has adequate capacity for
the combined load. The gas valve pressure regulator
on the heater is nominally preset as noted in Table I.
During normal operation, carbon dioxide should be 8.5
to 9.0% at full fire for natural gas and between 9.5 and
10.0% for propane gas. Carbon monoxide should be
‹150 ppm.
Fig. 11: Gas Supply Connection
CAUTION:
Do not use Teflon tape on gas line pipe
thread. A pipe compound rated for use with natural
and propane gases is recommended. Apply
sparingly only on male pipe ends, leaving the two
end threads bare.
CAUTION:
Support gas supply piping with
hangers, not by the heater or its accessories. Make
sure the gas piping is protected from physical
damage and freezing, where required.
NOTE: Manifold pressures should be ±0.3 in. WC.
Table I: Manifold Gas Pressure Settings
Model
No.
Manifold Pressure (in. WC)
Natural Gas
Propane Gas
High
Low
High
Low
300A
-1.0
0.0
-1.2
0.0
400A
-1.8
0.0
-1.1
0.0
500A
-1.1
-0.1
-1.1
0.0
700A
-1.4
0.0
-1.9
-0.1
850A
-2.0
-0.1
-1.1
0.0
18
Summary of Contents for XFyre 300A
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