Raypak 751 Operations Instructions download pdf (Page 51)

burners should reignite after pre-purge time delay.

8. Test limit control: While burner is operating, move

indicator on high limit control below actual boiler

water temperature. Burner should go off while

blower circulator continues to operate. Raise set-

ting on limit control above boiler water

temperature and burner should reignite after pre-

purge time delay.

9. Test ignition system safety device:

• Turn power off.

• Close the pilot manual valve.

• Turn power on; after about 45 seconds of pre-

purge, the pilot comes on. The pilot (and

therefore the burner) should fail to light. The

standard lockout time is 90 seconds; then the

pilot light goes off and the boiler goes into

post-purge. (If the lockout module is attached

to boiler, a lockout light comes on.)

• Turn the power off; open the pilot manual

valve; (reset the lockout module if applicable).

• Wait 30 seconds, then turn power on. The

burner should ignite after pre-purge time

delay.

10. To restart system, follow the lighting instructions.

11. High limit control set to design temperature

requirements of system? For multiple zones: flow

adjusted as required in each zone?

12. Boiler cycled with thermostat? Raise to highest

setting and verify boiler goes through normal start-

up cycle. Reduce to lowest setting and verify boiler

goes off.

13. Observed several operating cycles for proper

operation?

14. Set room thermostat or tankstat to desired temper-

ature?

15. Reviewed all instructions shipped with this boiler

with owner or maintenance personnel, returned to

envelope and given to owner or placed in pocket

inside front panel on boiler?

OPERATION

Operating Instructions

Lighting Instructions:

1. STOP! Read the safety information first.

2. Set the thermostat to the lowest setting.

3. Turn off all electric 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 and pilot manual

gas valve.

7. Wait five (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

information. If you do not smell gas, go to next

step.

8. Turn on all electric power to the appliance.

9. Set thermostat to desired setting. The appliance

will operate. The pilot burner will light after the pre-

purge time delay (45 seconds). Then the pilot will

light the main burner.

10. If the appliance will not operate, follow the instruc-

tion "To Turn Off Gas to Appliance", and contact a

qualified service technician.

11. Replace upper front panel.

To Turn Off Gas to Appliance

1. Set the thermostat to lowest setting.

2. Turn off all electric power to the appliance if serv-

ice is to be performed.

3. Remove upper front panel.

4. Turn off main manual gas valve and manual pilot

gas valve.

5. Replace access panel.

If boiler fails to start, check for:

• Loose connections, blown fuse or service

switch off?

• High temperature limit switch set below boiler

water temperature?

• Thermostat set below room temperature?

• Gas not turned on at meter or boiler?

• Incoming dynamic gas pressure less than 6 in.

WC for Natural gas, 10 in. WC for Propane?

MAINTENANCE

Suggested Minimum

Maintenance Schedule:

Regular service by a qualified service agency and

maintenance must be performed to ensure maximum

boiler operating efficiency.

Maintenance as outlined below may be performed by

the owner.

Yearly (Beginning of each heating

season):

1. Annual service call by qualified service agency.

2. Visually check top of vent for soot. Call service

person to clean. Some sediment at bottom of vent

is normal.

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Raypak 751 Operations Instructions Page 51

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