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Gas Supply Pressure
A minimum of 5.6 in. WC and a maximum of 10.5 in. WC
upstream gas pressure is required under load and no-load
conditions for natural gas. A minimum of 11.0 in. WC and
a maximum of 13.0 in. WC is required for propane gas.
The gas pressure regulator(s) supplied on the heater is for
low-pressure service. If upstream gas pressures exceed
14.0 in. WC, intermediate gas pressure regulators, of the
lockup type, must be installed.
CAUTION: Do not use Teflon tape on gas line pipe
A
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,
A
not by the heater or its accessories. Make sure the gas
piping is protected from physical damage and freezing,
where required.
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(s) on the Hi Delta heater
are nominally preset at 3.5 in. WC. The pressure regulator
on the FlexGas propane system is nominally set at 2.2 ±
0.1 in. WC. This can be verified by measuring the propane
gas pressure at the upper manifold pressure tap shown
in Figure 4. The pressure at the gas valve(s) outlet tap,
measured with a manometer, while in operation should be
3.5 ± 0.1 in. WC for natural gas. A nominal pressure of 1.3
in. WC will be observed at the individual heater gas valve
outlet taps on propane gas. See Figure 4 for gas pressure
measurement locations.
6
APPROVED
LOW GAS PRESSURE SWITCH
(OPTIONAL ON 302CD-902CD)
Figure 2.
Gas Supply Connection - Top View
Bleeds/Vents
This FlexGas gas train is equipped with a propane gas
regulator which may need to be vented to the outdoors
as required by state and local codes. If the regulator is
required to be vented, the cover must be removed and
vent lines installed and ran to a suitable location outside
the building in compliance with the NFGC. See Figure 3.
Figure 3.
UNCONTROLLED DOCUMENT IF PRINTED
CAUTION: Do not adjust the individual heater gas
A
valve pressure settings when firing with propane gas.
Propane adjustments (if necessary) should ONLY be
made to the FlexGas propane regulator.
NOTE: DO NOT adjust the FlexGas propane regulator
setting without verifying proper operation including the
use of a flue gas analyzer.
FlexGas Cover Removal & Vent Locations
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