OHP Installation Manual

20
OHP Series
3.0 Operation
3.0 Operation • Sequence of Operation
Important! Before operating the heater, conduct the following safety procedures:
• Check for any possible gas leaks.
• Alert all persons about the hazards of high surface temperatures and to keep a safe distance away in
order to avoid burns and possible clothing ignition.
• Provide supervision when young children are in the area of the heater.
• Check to make sure clothing isn’t hung from the heater and that flammable materials are not
placed on or near the heater.
• Check that all guards or protective devices are in place and secure.
• Check control compartment, burners, and circulating air passages for debris. If necessary, clean the
debris.
Sequence of Operation
Starting Circuit:
When voltage is applied to the controls connection, the ignition module sends power to the gas valve while
simultaneously sending spark to the igniter. The ignition time is 15 seconds. Once the flame on the burner
is established, the ignition module will continuously monitor the flame. The heater will continue to run as long
as there is 24 VAC present in the call for heat. If the heater does not light on the first trial, the heater will
attempt two more ignitions prior to going into a lockout mode.
Running Circuit:
After ignition, the flame rod monitors the flame. As long as a flame is present, the valve is held open. If the
flame is lost, the control acts to close the valve within one second, and a new trial sequence identical to that
at start-up is initiated. If proof of flame is not established within the 15 second trial for ignition, the unit will
retry two additional times before entering lockout mode. If lockout occurs, the control can be reset by briefly
interrupting the power source.
WARNING
!
Improper operation of the heater may result in explosion, fire,
shock, and carbon monoxide poisoning. Follow all guidelines
and warnings in this manual and national, state, provincial, and
local codes. Always conduct safety checks before operating the
heater. Do not operate the heater in unsafe conditions.