Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 20)

TESTING THE THERMOCOUPLE AND GAS CONTROL VALVE/THERMOSTAT

Thermocouple Output Test

The following test will check the DC voltage generated

by the thermocouple when the pilot light is lit.

1. Disconnect the thermocouple from the gas control

valve/thermostat as shown in the adjacent figure.

2. Using a multimeter with alligator clips leads,

attach the red lead to the body (copper part) of the

thermocouple. Attach the black lead to the end

(silver part) of the thermocouple. Reference the

adjacent image for placement of the leads.

3. Follow the lighting instructions on the front of the

water heater to light the pilot and watch the voltage

readings on the multimeter. NOTE: You will have

to hold the button down to keep the pilot lit for the

duration of the test. After 45 seconds the meter

should read 20-30 millivolts DC or more.

IF . . . . . . THEN

the multimeter voltage reads

at least 20-30 millivolts DC

• check the positioning of the thermocouple tip to the pilot flame. If

necessary position the thermocouple to ensure the flame contacts the

thermocouple’s tip. Re-test the thermocouple, and if it fails replace the

thermocouple. (See p. 22)

the multimeter voltage reads

more than 20-30 millivolts DC

• the thermocouple is working properly. Proceed to the gas control valve/

thermostat test.

Gas Control Valve/Thermostat Test

(Thermal Switch Models)

The following test will check the gas control valve/

thermostat’s ECO & TCO (Energy Cut Off & Thermal Cut

Off). NOTE: This test applies to gas valves with wire leads

that attach to the thermal switch on the manifold door.

Remove both wire leads from the TCO (thermal cut 1.

off switch) and jumper the two leads to complete

the circuit. Once the test is complete, remove the

jumper and reconnect the wire leads.

Follow the lighting instructions on the front of the 2.

water heater to light the pilot.

Release the knob and check to see if the pilot 3.

remains lit.

TCO

WIRE LEADS

(JUMPERED)

TCO

SWITCH

TCO

WIRE LEADS

GAS CONTROL

KNOB

IF . . . . . . THEN

the pilot lights and remains lit • the TCO (thermal switch sensor) has tripped OR the TCO is not

working (OPEN). Reattach the wire leads and press the TCO reset

button. Relight the water heater. If the pilot will not remain lit, replace

the TCO. If the pilot does remain lit, the TCO was tripped-possibly

due to a lack of combustion air (see pp 13-16 & 18-19) OR because

of a Flammable Vapor event. Check around the water heater for any

source of ﬂ ammable vapors (i.e. gasoline, paint thinner, etc.).

the pilot will not light or remain

lit with the wire leads jumpered

• replace the gas control valve/thermostat.

(See p. 24)

Figure 20

Figure 21

IMPORTANT: Before performing any test, check the area around the water heater for any source of a Flammable

Vapor (i.e gasoline, paint thinners, etc.) If any sources are found do not proceed until they are removed.

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