Raypak 751 manual ADB Initial START-UP, Tools Needed, Preparation for Start-up

ADB INITIAL START-UP

CAUTION: Verify that the vent system and combustion air supply have been approved.

Turn Off The 1 1/2” Manual Gas Valve; Turn Off Pilot Gas Valve;

Reset Low Gas Pressure Cut-off Switch;

Bleed Air from Gas Line

Tools Needed

•One 8-0-8 , 16” scale manometer (or larger)

•Four 4-0-4, 8” scale manometers (or larger)

•“T” fitting

•7/16” and 1/2" open end wrenches

•Small and large flat-head screwdrivers

•Volt meter

•Amp probe

•Elec. Dual reading thermometer with strap on sen- sors

•3/16” Allen wrench

•Combustion analyzer

Preparation for Start-up

WARNING: DO NOT TURN ON GAS AT THIS TIME.

Check Power Supply

With voltmeter at incoming power check voltage between:

Hot - Common (»120 VAC)

Hot – Ground (»120 VAC)

Common - Ground (< 1 VAC)

If Common - Ground is > 1 VAC - STOP: Contact elec- trician to correct ground failure.

WARNING: Failure to do this may burn out 120V- 24V transformer, or may cause other safety control damage or failure.

Attach Manometers to Measure Pressures (See Fig. 37)

•Attach 16" scale manometer to the first gas shut- off valve pressure tapping, Location (1)

•Attach one 8" scale manometer to each manual gas valve pressure tapping, Locations (2) and (3).

•Attach one 8" scale manometer to the outlet side of pilot gas valve pressure tapping, Location (4).

•Attach one 8" manometer to “T” fitting, air pressure switch, and aluminum tubing, Location (5).

CAUTION: Make sure there is no ignition source in the boiler room.

•With power off, slightly open union outside the cabinet to bleed air.

•Close union when you smell gas.

•Wait minimum 5 minutes to clear the gas out of the boiler room before continuing.

Check the Gas Supply Pressure, Location (1)

•Leave pilot gas valve and first manual gas valve closed;

•Slowly turn on main gas shut-off valve (outside the unit);

•Read the gas supply pressure from the manome- ter (Location 1);

•If pressure is > 14" W.C., Turn off the valve;

•Check if the service regulator is installed and/or adjust the service regulator.

START-UP

NOTE: Reference the start-up pressures settings located on the side of the control box.

Blower Adjustment

1.Main gas shut-off valve is still closed;

2.Turn power on;

3.Check blower manometer reading, Location (5). Compare your reading to the “Pre-Fire” values shown in tables T and U. If not, adjust the air shut- ter on the blower to attain the correct value;

4.Turn power off.

Pilot Adjustment

1.Turn on the gas shut-off valve, the main gas man- ual valve, and the pilot manual valve;

2.Turn off the manual gas valves at Locations (2) and (3);

3.Turn power on, after 40-45 seconds, ignition con- trol will energize and send spark to ignition, observe through view port for spark;

4.If you do not see spark, turn off power, check igni-

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