Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 18)

CHECKING THE GAS SUPPLY PRESSURE

Checking the Gas Supply Pressure

Gas pressure checks are done with flowing gas using

a gas pressure gauge capable of reading pressure in

inches of water column.

• Supply gas pressure checks are measured before

the gas control valve/thermostat and as close to

the water heater as possible.

• Manifold (main burner) gas pressure is measured

at the pressure tap on the bottom of the gas

control valve/thermostat. Use an Allen wrench to

remove the plug then attach the gas gauge.

NOTE: Desired gas pressures will be noted on the

gas valve label located on the gas control valve/

thermostat.

GAS

PRESSURE

GAUGE

CONNECTED AT

PRESSURE TAP

MANIFOLD GAS PRESSURE TEST

WHITE RODGERS GAS CONTROL

VALVE/THERMOSTAT SHOWN

GAS PRESSURE LABEL

Figure 16

IF . . . . . . THEN

supply gas pressure is under desired pressure

requirement

• increase supply gas pressure regulator setting

and,

• increase supply gas piping size.

supply gas pressure is over desired pressure • add gas pressure regulator.

• reduce setting on existing regulator.

manifold gas pressure is more than +/- .3 inch

W.C. from values indicated on gas valve

ensure there is adequate supply gas pressure•

e• nsure the main burner oriﬁ ce is the correct size

for the water heater model being tested.

if the above tests have been performed and the •

results were correct replace the gas control valve.

Combustion Air Test

The Installation Instructions and Use & Care Guide

gives guidelines under “Air Requirements” and

“Unconfined “ or “Confined Space” sections. If you

want to test for a lack of air:

1. Turn on every appliance and fan that exhausts

air from the utility room and/or house. Make

sure all windows and doors are closed, as well

as chimney dampers.

2. Open a hot water faucet so that the main

burner will ignite

3. Remove the outer door of the water heater –

not the inner door

4. Monitor the flame characteristics for several

minutes

If the flame begins to “yellow” open a door or window,

to the outdoors, to see if additional air corrects this

back to blue. If it does, the room needs more air

supply.

CHECKING FOR SUFFICIENT COMBUSTION AIR OR VENTING ISSUES

REVERSE FLOW

OF VENT PRODUCTS

EXHAUST FAN

VENT

Figure 17

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