Gas Type Conversion On Valve; Safety Inspection; Follow-Up - Raypak HD401 Installation & Operating Instructions Manual

Fig. 35: Gas Valve Adjustment (Invensys Valve)
8. Carefully place the spring & weight back in before
replacing LO-fire adjustment cap.
9. For LO-fire adjustment, tighten the cap to increase
the pressure, loosen to decrease.
10. When correct settings are set, replace the sole-
noid and tamper screw in place.

Gas Type Conversion on Valve

WARNING: Burner orifices must be changed when
changing gas type.
NOTE: Model HD401 requires replacement of
valve.
1. Turn off gas supply at the appliance service level.
2. Remove the pressure regulator cover assembly.
3. Remove the existing stem/spring assembly.
4. Insert the replacement stem/spring assembly.
5. Replace the pressure regulator cover assembly
and tighten screws.
6. Mount conversion labels on the gas valve.
Fig. 36: Gas Type Conversion on Honeywell Valve

Safety Inspection

• Replace main gas manifold adjustment screw cap.
• Check all thermostats and high limit settings.
• During the following safety checks leave manome-
ters hooked up, check and record.
• If other gas fired equipment are in the room and on
same gas main check all pressures on the Hi Delta
SS with all other equipment running.
• Check thermostats for ON/OFF operation.
• Check High limits for ON/OFF operation.
• While in operation, check flow switch operation.
• Check the low gas pressure switches (For proper
adjustment, if available, use the attached
manometers to set pressure. The scales on the
switch are approximate only); Low gas pressure
switch (optional) must be set at 3.5 in. WC for nat-
ural gas and 10.5 in. WC for LP gas.
• High gas pressure switch (optional) at 1 in. WC
above manifold pressure.
• Insert ignition control lockout tests as safety
check.

Follow-Up

• Safety checks must be recorded as performed.
• Turn unit on.
After main burner ignition:
• Check Manometer(s) for proper reading(s).
• Cycle unit several times and recheck readings.
• Re-analyze with unit running record or print
results.
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