A
XES SC MANUAL
IOM-58
18 of 30
June 14 R5
NATURAL GAS AND PROPANE INSTALLATION
1.
Installation must be made in accordance with the requirements of the authorities having jurisdiction.
2.
Check the unit rating plate and confirm fuel type, supply pressure, input rating and temperature rise.
3.
Refer to the heater rating plate for determining the minimum gas supply pressure for obtaining the
maximum gas capacity for which this heater is specified.
4.
Gas supply pressure higher than the unit rating plate requires an additional field supplied gas
regulator.
5.
Install an approved appliance shutoff valve on the gas supply in accordance with the requirements of
the authorities having jurisdiction.
6.
Gas lines shall not interfere with unit access. The gas line connection at the heater shall have an
approved drip leg with screwed cap.
7.
A minimum 1/8 inch NPT plugged tapping, accessible for test gauge connection, must be installed
immediately upstream of the gas supply connection to the unit.
GAS LINE TESTING (EXTERNAL TO THE UNIT)
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system
during any testing of that system at test pressures in excess of 0.5 psi (3.5 kPa).
The appliance must be isolated from the gas supply system by closing its individual shutoff valve during
any testing of that system at test pressure equal to or less than 0.5 psi (3.5 kPa).
ELECTRICAL INSTALLATION
Do not install anything that will interfere with equipment access or the rating plate.
All penetrations through the unit walls must be caulked and sealed to prevent air from entering the
unit.
The unit must be electrically grounded and all wiring must be installed in accordance with the National
Electrical Code, ANSI/NFPA 70, and/or the Canadian Electric Code CSA 22-1 and to the approval of the
authorities having jurisdiction. Field wiring diagrams, internal wiring diagrams and operating functions are
included in the control cabinet. The power requirements are indicated on the rating plate. Where field
wiring of control circuits is required, take care to size the field wiring for a maximum 10% voltage drop.
The control circuit ampacity is noted on the field wiring diagram. See the field wiring diagram for
requirements for shielded or twisted pair wire for solid state devices.
