Wayne HSG400 Specifications download pdf (Page 7)

PAGE 6

I. COMBINATION GAS VALVE

The 24 VAC combination gas valve serves three (3)

functions: (1) manual gas shut-off, (2) main gas

flame pressure regulator, (3) automatic electric

redundant (double seated) gas shut off. (See

Figure 11)

The correct operating manifold orifice pressure range

for both natural and propane gas is 2.0” W.C.

(498.2Pa) minimum to 4.0” W.C. (996.4Pa)

maximum. By adjusting the pressure regulator

between 2.0” W.C. (498.2Pa) and 4.0” W.C.

(996.4Pa) on either natural or propane gas, a wide

input range can be achieved with a single orifice size.

If the desired input rating cannot be obtained within

the above manifold orifice pressure adjustment

range, the next size larger or smaller orifice should be

used. (Refer to orifice chart Fig. 10.)

J. PRESSURE REGULATOR ADJUSTMENT

The combination gas valve pressure regulator,

which has an outlet pressure setting range of

approximately 2.0” W.C. (498.2Pa) to 4.0” W.C.

(996.4Pa) is factory set at 3.5” W.C (871.85Pa).

When pressure adjustment is required for setting

input capacity with a selected orifice from Figure 10,

remove the regulator cap for access to the slotted

adjustment screw. Turning the screw counter

clockwise reduces manifold orifice pressure,

clockwise increases the pressure.

NOTE: MANIFOLD PRESSURE ADJUSTMENTS

CAN ONLY BE MADE WITH THE

BURNER RUNNING AND THE GAS ON.

The 1/8” (3.175mm) NPT pressure tap for orifice

manifold pressure measurement is located on the

outlet side of the combination gas valve. Use a “u”

tube manometer or dial type pressure gauge,

scaled from “0” zero to 15.0” W.C. (3736.5Pa) to

read pressure (See Figure 11).

Figure 11

1/8” (3.175mm) NPT

PRESSURE TAP

PLUG

1/8” (3.175mm) NPT

PRESSURE TAP PLUG

HSG 200/400 GAS VALVE

HONEYWELL VR8305

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Wayne HSG400 Specifications Page 7

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