Roberts Gorden BH-175, BH-60 Operation and Maintenance, Sequence of Operation, To Shut Off Heater

SECTION 11: OPERATION AND MAINTENANCE

SECTION 11: OPERATION AND MAINTENANCE

DANGER		WARNING
Electrical Shock Hazard	Explosion Hazard	Burn Hazard	Cut/Pinch Hazard
Disconnect electric	Turn off gas supply to	Allow heater to cool	Wear protective gear
	heater before service.	before service.	during installation,
before service.
			operation and service.
Heater must be		Tubing may still be hot
connected to a properly		after operation.	Edges are sharp.
grounded electrical
source.

Failure to follow these instructions can result in death, electric shock, injury or property damage.

This heater is equipped with a direct spark ignition	8. When thermostat is satisfied, all power to the
system.	unit is shut off.

11.1 Sequence of Operation

1.Turn the thermostat up. When the thermostat calls for heat, the blower motor will energize.

2.When the motor approaches nominal running RPM, the pressure switch closes and activates the ignition module.

3.After a 45 second prepurge, the ignition module then opens the gas valve and energizes the spark igniter.

4.When the flame is established, the sparking sequence ceases.

5.If the flame is not established during the ignition sequence, the ignition module closes the gas valve and purge begins. Module will try 2 additional times for ignition (with purges in between trials). If ignition is not established, the module will lockout.

6.If the flame extinguishes during operation, the ignition module will attempt the multiple trial sequence described in step 5. If ignition is not re-established, the module will lockout for one hour or until reset.

7.After lockout, the control can be reset by turning down thermostat for five seconds, and then raising it again to desired temperature, or by disconnecting power and then reconnecting.

11.2 To Shut Off Heater

Set thermostat to lowest setting. Turn OFF electric power to heater.

Turn OFF manual gas valve in the heater supply line.

11.3 To Start Heater

Turn gas valve and electric power OFF and wait five minutes for unburned gases to vent from heater. Turn ON main gas valve.

Turn ON electric power.

Set thermostat to desired temperature. Burner should light automatically.

11.4Pre-Season Maintenance and Annual Inspection

To ensure your safety and years of trouble-free operation of the heating system, service and annual inspections must be done by a contractor qualified in the installation and service of gas-fired heating equipment.

Turn off gas and electric supplies before performing service or maintenance. Allow heater to cool before servicing.

Before every heating season, a contractor qualified in the installation and service of gas-fired heating equipment must perform a thorough safety inspection of the heater.

For best performance, the gas, electrical, thermostat connections, tubing, venting, suspensions and

47 of 59