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DUALAIR
®
HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
36
SECTION 16: REMOVAL AND REPLACEMENT PARTS
See warnings and notes on Page 28, Section 13
before removing or replacing parts.
Burner Components
All serviceable burner parts are accessed by the
door on the side of the heater.
See Page 5, Section 4.
16.1 Gas Valve
The VR4605 gas valve is fitted with the V7335A
Modureg regulator (P/N L512) supplied as a
separate component.
When replacing the gas valve, the Modureg will
need to be fitted on site. To fit the Modureg, remove
the standard regulator by removing the two screws
retaining the rubber sealing washer. See Page 36,
Figure 17
Figure 17: Standard Regulator Removal
Fit the Modureg ensuring that the rubber seal is in
place and the two screws are tight. See Page 36,
Section 16.1.1. Once fitted follow commissioning
procedure in Section 11.
16.1.1 Gas Valve Replacement - (all models)
16.1.2 Gas Valve Replacement continued- (all models)
Replace in reverse order. Verify that the gas flow
direction of the valve is correct. Re-use the "O" ring
seal in the outlet flange where fitted. Check that all
the joints are leak free. Reset gas valve.
See Page 23, Section 11.4.2.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVES SPECIFIED FOR EACH MODEL
TYPE ARE USED WHEN REPLACING THESE
CONTROLS.
Remove Standard
Regulator
Sealing
Washer
Step 1
Unscrew
gas pipe
from the
valve inlet.
Step 2
Unscrew valve from the
burner manifold
or
unscrew the screws for
the inlet and outlet flanges.
Ignition
Control
Rubber
Seal
Modureg Modulating
Regulator
Description Part Number
Gas Valve VR4605 90033404
Ignition Control 90434020