A.O. Smith GWV - 120, Installation And Service Manual

Page: 37 / 102

Instruction manual GWV 37
is
Gas control
3.11.1 Preparation
To check the supply pressure and burner pressure, proceed as follows:
1. Isolate
(10.3 "Isolating the appliance from the mains") the appliance from
the power supply.
2. Undo the screws of the front cover.
3.11.2 Procedure for checking pressures
1. There are two test nipples on both gas controls:
- a supply pressure nipple (1)
- a burner pressure nipple (2)
Sealing screws are located inside the test nipples. Loosen both sealing
screws by a few turns. Do no completely undo them, as it may be awkward
retightening them.
2. Connect a pressure gauge to the burner pressure nipple (2).
3. Open the gas supply and vent the gas supply line through the supply
pressure nipple (1).
4. Connect a pressure gauge to the supply pressure nipple (1) when gas starts
to flow from this nipple.
5. Switch on the power to the appliance using the isolator on the appliance.
6. Switch the electronic controller
ON by setting the 0/I switch to position I .
Legend
Only applicable numbers are
mentioned.
1.
supply pressure test nipple
2. burner pressure test nipple
3. burner pressure regulator
4. burner pressure control cap
5. burner pressure control
adjusting screw
IMD-0510 R0
3
1
2
4
5