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UBXC-UDXC-IOM (01-24) 1042980-0
CONTROLS—CONTINUED
Multiple Heater Control
If the heater was ordered with a multiple heater control option, one thermostat can be used to control up to five
heaters. This option includes a 40VA transformer that replaces the standard transformer in the control unit and a relay
assembly that attaches to the additional unit. Option CL31 provides for control of two heaters. If control of additional
heaters is desired (up to five total), option CL32, which is the relay assembly only, must be added to each additional
heater. The option packages are shipped separately and include complete instructions on installation and wiring.
OPERATION
⚠ DANGER ⚠
• For your safety, read before operating. If you do not follow these instructions exactly, a fire or
explosion may result, causing property damage, personal injury, or loss of life.
• This appliance does not have a pilot. It is equipped with an ignition device which automatically
lights the burner. Do not try to light the burner by hand.
• Before operating, smell all around the appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
• WHAT TO DO IF YOU SMELL GAS:
a. Do not try to light any appliance.
b. Do not touch any electrical switch; do not use any phone in your building.
c. Leave the building immediately.
d. Immediately call your gas supplier from a phone remote from the building. Follow the gas supplier’s
instructions.
e. If you cannot reach your gas supplier, call your fire department.
• Use only your hand to turn the gas control ON/OFF knob on the gas valve. Never use tools. If the
valve ON/OFF knob will not turn by hand, do not try to repair it. Call a qualified service technician.
Force or attempted repair may result in a fire or explosion.
• Should overheating occur, or the gas supply control system fail to shut off the flow of gas, turn
off the manual gas valve to the appliance before shutting off the electrical supply.
• Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the control system and any gas
control which has been under water.
• All components of a gas supply system must be leak tested prior to placing equipment in service.
NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal
injury, property damage, or death.
Pre-Startup Checklist
Check the following before startup:
Check to ensure that all screws used to secure shipping brackets have been re-installed in heater cabinet.
Check suspension—unit must be secure and level.
Check to ensure that clearances from combustibles are in accordance with Table 1.
Check vent system to ensure that it is installed in accordance with venting instructions.
Check piping for leaks and proper gas line pressure and bleed trapped air from gas lines (refer to Supply Piping
Connections section).
Check electrical wiring—ensure that all wire gauges are as recommended—service disconnect switch should be
used—verify that fusing or circuit breakers are adequate for load use.
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