Reznor MAPS - A,B,C Users Manual Bedienungsanleitung PDF herunterladen (Seite 27)

Form O-MAPSIII&IV Cabinets A/B/C, P/N 257004R8, Page 27

Optional High Gas

Pressure Switch

Optional Low

Gas Pressure

Switch

Dual, Single-Stage Gas Valve

Ball Valve

Transducer

From Gas

Supply

Burner

Manifold Pressure Tap

Ball Valve

Actuator

FIGURE 15C -

Components in the

Heat Section Gas

Train - MAPS

III&IV

Cabinet C (Heat

Section Sizes 400,

500, 600, 700)

Single-Stage Operating Gas Valve - All gas trains have either a single-stage or a dual single-stage safety gas valve.

The gas valve must be checked annually to ensure that it is shutting off gas ow completely; follow the instructions in

box below.

Instructions:

1. Locate the 1/8" NPT pressure tap or taps on the

combination valve.

2. Turn the knob(s) or switch to the OFF position to

prevent ow to the manifold. Connect a manometer to

each of the 1/8” outlet pressure taps (1 on the single-

stage valve; 2 on the dual single-stage valve). NOTE:

Manometers (uid-lled gauges) with inches water

column scale are recommended. Turn the heater off.

On the valve, turn the knob(s) or switch to the ON

position.

3. Use nger(s) to fully block the burner orice(s).

Continue blocking for several seconds and observe

the manometers. If any pressure is indicated, the gas

valve is leaking. A leaking gas valve must be replaced

before the heater is put back in operation.

Orifice

Adapter

Orifice Adapter

Optional High Gas

Pressure Switch

Transducer

Ball

Valve

Single-Stage

Gas Valve

Ball Valve

Actuator

Optional Low Gas

Pressure Switch

Manifold Pressure Tap

FIGURE 15B -

Components in the

Heat Section Gas

Train - MAPS

III&IV

Cabinet B (Heat

Section Sizes 250

and 300)

FIGURE 16A - Top View of Single-Stage Gas

Valves used on Cabinet A or B Sizes

1/8” Outlet

Pressure

Tap

1/8” Outlet

Pressure

Tap

FIGURE 16B - Top View of Dual Single-Stage

Gas Valve used on Cabinet C Heat Section

1/8” Output

Pressure Tap

Inlet

Pressure Tap

Adjust Outlet

Pressure

Modulating Valve

The gas train also has a ball valve with an actuator to control gas ow. The ball valve

and actuator are located downstream of the regular or dual single-stage valve as

shown in FIGURE 17A.

Carefully clean external dirt accumulation from the actuator.

Pressure

Adjustment

Pressure

Adjustment

1/8”

Output

Pressure

Tap

Inlet Pressure

Tap

Adjust Outlet

Pressure

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 39 40

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