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13.
GAS SUPPLY - HEATER EXPANSION - FLEXIBLE GAS CONNECTION
The gas supply must be installed to the heater using:
USA: an approved Stainless Steel Flexible Gas Connector certified for use on an infrared
•
radiant tube heater (ANSI Z21.24 CSA 6.10);
CANADA: an approved Type 1 Hose Gas Connector (CAN/CGA 8.1).
•
The heater must be isolated from the gas supply piping system by closing its individual
•
manual shut off valve (field supplied) during any pressure testing of the gas supply piping
system.
CAUTION:
Compensation for normal gas supply pipe expansion, and radiant tube heater
expansion must be provided. All piping must conform to local codes— Refer to
Heater Expansion & Flexible Gas Connection—Sections 14 next two pages
Provide a 1/8 in (3.2 mm) NPT plugged tapping, accessible for test gauge con-
nection, immediately upstream of the gas supply connection to the heater.
DO NOT use pressure greater than 1/2 psig to pressure check the heater.
TEST FOR LEAKS: All gas piping and connections must be tested for leaks after
the installation is completed.
DO NOT USE A MATCH OR OPEN FLAME OF ANY KIND TO TEST FOR
LEAKS. Apply soap suds solution to all connections and joints and if bubbles
appear, leaks have been detected and must be corrected. NEVER OPERATE
THE HEATER WITH LEAKING CONNECTIONS.
The supply system should be checked first with heater turned "OFF" followed by
another check with heater turned "ON".
IMPORTANT: Minimum supply line pressure at the inlet to the heater regula-
tor must not be lower than 5.0 inches of water column pressure for natural
gas. The supply gas pressure must be checked with all heaters in opera-
tion.
Installation of a gas line (trap) "drip leg" is required at the inlet connection tee fol-
lowing the pipe drop to the heater. Failure to provide a "drip leg" could result in
condensation and foreign matter passing into the gas valve. Failure to install a
"drip leg" in the gas line can cause property damage, injury or death and will void
the heater warranty.
TABLE 4
GAS TYPE
Natural Gas
Propane
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
INLET SUPPLY PRESSURE
INCHES WATER COLUMN
MINIMUM
MAXIMUM
5.0
11.0
MANIFOLD PRESSURE
(tap at gas valve outlet)
INCHES WATER COLUMN
14.0
14.0
36
HI:
3.5
LO:
2.2
HI: 10.0
LO:
5.0
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