ETERNITY 26 Manuel de l'opérateur télécharger pdf (Page 24)

Checking Gas Combustion Specifications

Figure 1:

The gas valve is designed with both test ports for gas supply pressure to the unit, and manifold pressure. Refer to

Figure 1 for locations of the test ports on the gas valve.

Check manometer reading of low fire manifold pressure

against unit combustion specifications on p.12. If low

fire manifold pressure needs to be adjusted, loosen the

nut securing the adjustment knob on the bottom of the

gas valve (refer to Figure 1) and adjust to correct setting.

NOTE: Manifold Gas Pressure should only be ad-

justed on low Fire

NOTE: If gas supply pressure drops below 3.5" WC

unit will not have enough gas volume for max fire!

NOTE: Recirculation pump must be OFF when

checking Manifold Gas Pressure.

HOW TO CHECK GAS SUPPLY PRESSURE

Turn off power source and turn off gas supply to the

unit.

Remove the front cover from the unit.

Remove the gas supply pressure test port screw and

connect manometer to this port; turn on the gas to

the water heater.

Turn the water heater on and open multiple taps to

force unit into high fire; check gas supply pressure at

the test port with a manometer with unit in high fire.

HOW TO CHECK MANIFOLD GAS PRESSURE

While power and gas are off to the unit, open any hot

tap to flush and fill the tank completely with cold water.

Close the running tap and turn power and gas back

on to the unit; set temperature to 131F.

The unit should fire up to bring the internal storage

up to set temperature even without any tap open; this

is standby mode.

4.Wait for 10 seconds after the start of standby mode

combustion and check gas supply pressure and mani-

fold gas pressure at the test ports with a manometer.

Gas Supply

Min Max Pressure

GU20 0.9 "WC 1.6 "WC

GU26 0.9 "WC 2.4 "WC

GU28 0.5 "WC 1.8 "WC

GU32 0.5 "WC 2.5 "WCNG 3.5~10.5 "WC

GU20DV 0.9 "WC 1.6 "WC LP 8~14 "WC

GU26DV 0.9 "WC 2.4 "WC

GU28DV 0.4 "WC1.75 "WC

GU32DV 0.4 "WC 2.4 "WC

Manifold Pressure

Model

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 34 35

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ETERNITY 26 Manuel de l'opérateur Page 24

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