FlexGas System Start-up

Preparation

WARNING: Do not turn on gas at this time.

Check Power Supply

With multi-meter at incoming power in Hi Delta heater, check voltage between:

Hot - Common (≈120 VAC)

Hot - Ground (≈120 VAC)

Common - Ground (< 1 VAC)

WARNING: If Common - Ground is > 1 VAC,

STOP: Contact electrician to correct ground failure. Failure to do this may burn out 120V-24V trans- former, or may cause other safety control damage or failure.

Attach Manometers to Measure Pressures

1.Turn off main gas valves.

2.Attach 24” scale manometer to the first main gas shut-off valve pressure tapping.

3.Attach (1) 12” scale manometer to the outlet side of the second main gas shut-off valve pressure tapping.

4.Attach (1) 12” scale manometer near the fan-prov- ing switch. Pull black cap from air pressure switch tee and connect the manometer. NOTE: Retain caps for reinstallation later.

NOTE: The fan(s) pressure is already factory set to

1.4in. ± .1 in. WC (up to 4500 ft altitude). If adjust- ment(s) is required, consult the appropriate Hi Delta manual.

Check Gas Supply Pressure

1.Slowly turn on main gas shut-off valve.

2.Read the gas supply pressure from the manome- ter; minimum supply pressure for natural gas is 5.0 in. WC, recommended supply is 7.0 in. WC, mini- mum supply pressure for propane gas is 8.0 in. WC (dynamic readings, all stages firing).

3.If the pressure is > 14.0 in. WC, turn off the valve.

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

WARNING: This FlexGas heater is intended for operation on Natural Gas as the primary fuel. DO NOT use this heater with Propane Gas as the pri- mary fuel.

1.Turn off unit. Ensure that the switch on the FlexGas control is in the position marked “NAT”. See Fig. 6 for FlexGas control operation. Ensure the manual valve on the natural gas supply is open and the manual valve on the propane supply is closed.

2.Turn on the unit, wait 15 seconds, and the igniter should glow. Look into sight glass located at each end of the heater to check igniter operation. Gas valves should open in 45-60 seconds.

3.If burner does not light on first trial. It will retry, up to three times.

4.Main burner ignition: Check manifold gas pres- sure at gas valve outlet pressure tap. This should read 3.5 ± 0.1 in. WC for natural gas. If the natural gas manifold pressure is not within 3.5 ± 0.1 in. WC, follow the instructions in the Hi Delta I&O manual for adjusting manifold pressure. If a flue gas analyzer is used, the CO2 on natural gas should be 7.5-8.5% and CO should be less than 150 ppm.

NOTE: Do not adjust Hi Delta valve(s) or manifold settings when operating on propane. These should only be adjusted while firing natural gas.

5.When acceptable operation on Natural Gas is con- firmed, turn the gas selector key on the FlexGas control to “OFF”.

6.Close the manual valve on the natural gas supply then open the manual valve on the propane sup- ply. When the heater shuts off, turn the FlexGas control key counter-clockwise to the “PRO” posi- tion.

7.Wait 15 seconds, and the igniter should glow. Look into sight glass located at each end of the heater to check igniter operation. Gas valves should open in 45-60 seconds.

302BD-2342BD specifications

The Raypak 302BD-2342BD is a standout in the realm of commercial water heating, designed to meet the needs of various applications while ensuring efficiency and reliability. Known for its robust construction and state-of-the-art technology, this model is a preferred choice for both residential and commercial users.

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