Raypak 902B, 302B manual Operation, Lighting Instructions, To Turn Off Gas To Appliance

10.To restart system, follow lighting instructions in the Operation section.

11.Check to see that the high limit control is set above the design temperature requirements of the system.

For multiple zones: Check to make sure the flow is adjusted as required in each zone.

12.Check that the heater is cycled with the thermo- stat. Raise to the highest setting and verify that the heater goes through the normal start-up cycle. Re- duce to the lowest setting and verify that the heater goes off.

13.Observe several operating cycles for proper oper- ation.

14.Set the room thermostat or tankstat to desired temperature.

15.Review all instructions shipped with this heater with owner or maintenance person, return to enve- lope and give to owner or place the instructions inside front panel on heater.

OPERATION

Lighting Instructions

1.Before lighting, make sure you have read all of the safety information in this manual.

2.Set the thermostat to the lowest setting.

3.Turn off all electrical power to the appliance.

4.This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.

5.Remove upper front panel.

6.Turn on main manual gas valve.

7.Wait 5 minutes to clear out any gas. Then smell for gas, especially near the floor. If you then smell gas, STOP! Follow the steps in the safety informa- tion on the front cover of this manual. If you do not smell gas, go to next step.

8.Turn on all electrical power to the appliance.

9.Set thermostat to desired setting. The appliance will operate. The igniter will glow after the pre- purge time delay (15 seconds). After igniter reaches temperature (45 seconds) the main valve will open. System will try for ignition three times. If flame is not sensed, lockout will commence.

10.If the appliance will not operate, follow the instruc- tions “To Turn Off Gas To Appliance,” and call your service technician or gas supplier.

11.Replace access panel.

12.If heater fails to start, verify the following:

a.There are no loose connections or that the service switch is off.

b.High temperature limit switch is set above wa- ter temperature.

c.Thermostat is set above room temperature.

d.Gas is on at the meter and the heater.

e.Incoming gas pressure to the gas valve is NOT less than 5.0 in. WC for natural gas, 11.0 in. WC for propane gas.

To Turn Off Gas To Appliance

1.Set the thermostat to lowest setting.

2.Turn off all electrical power to the appliance if serv- ice is to be performed.

3.Remove upper front panels.

4.Turn off main manual gas valve.

5.Replace access panel.

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