7
1 Gas connections (continued)
Dual Fuel Supplemental Manual
Figure 1-3 Proof of Closure Valve Orientation
Reference FIG. 1-1 for assembly of the proof of closure valve.
Note: DO NOT install the actuator portion of the proof of
closure assembly at this time. Verify that when installing the
proof of closure valve the directional arrow located on the valve
body is pointing toward the boiler inlet gas piping (FIG. 1-3).
Orient the proof of closure valve as shown in FIG. 1-3.
Assemble proof of closure valve
1. Remove the upper most pressure plug from the proof of
closure valve body. Install high and low gas pressure
assembly as shown in FIG. 1-4.
2. With the proof of closure actuator body oriented as shown
in FIG. 1-5, loosen the two (2) screws to remove the metal
access plate.
3. Remove the two (2) knockouts on the actuator (FIG. 1-5).
Be sure to remove any parts of the knockout that may
remain inside the actuator assembly.
4. Attach the proof of closure actuator to the proof of closure
valve using the two (2) set screws which are part of the
actuator assembly (FIG. 1-6). Make certain the actuator is
fully seated to the valve body, see FIG. 1-6.
Assemble the high and low gas pressure switch
assembly
Figure 1-6 Attach Proof of Closure Actuator to the Proof
of Closure Valve
PLUG FOR THE
GAS PRESSURE
SWITCHES
TO BOILER
INLET
DIR #2000540612 00
REMOVE UPPER MOST
PRESSURE PLUG
BUSHING
ELBOW
NIPPLE
PRESSURE
SWITCH
TEE
PRESSURE
SWITCH
TEE
BRASS PLUG
NIPPLE
Figure 1-4 High and Low Gas Pressure Switch Assembly
Figure 1-5 Remove Cover and Knockouts for Wiring
LOOSEN SCREWS
TO REMOVE OUTER
COVER
REMOVE KNOCKOUTS (THIS SIDE)
FRONT SET SCREW
BOTTOM SET SCREW
FULLY SEAT TO
VALVE BODY
PROOF OF CLOSURE
ACTUATOR
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