Installation Manual

24
HE+ Series Infrared Gas Heater Installation and Operation Manual
12. 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);
• 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.
Provide a 1/8 in (3.2 mm) NPT plugged tapping, accessible for test gauge connection, immedi-
ately 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.
Apply soap suds solution to all connections and joints and if bubbles appear, leaks have been
detected and must be corrected. DO NOT USE A MATCH OR OPEN FLAME OF ANY KIND
TO TEST FOR LEAKS. 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 regulator must not
be lower than 5.0 inches of water column pressure for natural gas, and 11.0” w.c. for pro-
pane gas. The supply gas pressure must be checked with all heaters in operation.
Installation of a gas line (trap) “drip leg” is required at the inlet connection tee following 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
NOTE: Access to the manifold pressure test port is on the top of the valve. A 3/16" Allen Wrench is necessary
to remove the plug from the port.
When checking or setting the manifold pressure, a water manometer or accurate inches water column
gauge must be used. Gauges which measure ounces per square inch or pounds per square inch are not accu-
rate enough to properly measure and set the pressure.
INPUT GAS TYPE
LINE PRESSURE
INCHES WATER COLUMN
MANIFOLD PRESSURE
(tap at gas valve outlet) INCHES
WATER COLUMN
MINIMUM MAXIMUM
Single Stage
Natural Gas 5.0 14.0 3.5 (4.2 for 225 & 250 Btuh Models)
Propane Gas 11.0 14.0 10.0
Natural Gas 5.0 14.0 3.5 High / 2.0 Low
Two Stage
Propane Gas 11.0 14.0 10.0 High / 5.0 Low
Modulating
Natural Gas 5.0 14.0 See Modulating Manual
Propane Gas 11.0 14.0 See Modulating Manual