Roberts Gorden Caribe CGTH-30 User Manual

34 

1. Set the thermostat to the lowest setting.

2. Turn off all electric power to the heater.

3. Do not try to light the burner by hand.

4. Turn off the manual gas valve in the heater supply 

line.

5. Wait five (5) minutes to clear out any gas. If you 

then smell gas, STOP! If you do not smell gas, go 
to the next step.

6. Open the manual gas valve in the heater supply 

line.

7. Turn on electric power to the heater.

8. Set the thermostat to the desired setting.

9. If the heater will not operate, See Section 8.2 and 

call your service technician or gas supplier.

1. Set the thermostat to the lowest setting.

2.Turn off all electric power to the heater if service is 

to be performed.

3.Turn off the manual gas valve in the heater supply 

line.

1. When the thermostat calls for heat, the blower 

motor will energize.

2. When the motor approaches nominal running 

speed, the pressure switch closes and activates 
the ignition module which in turn initiates the 
purge.

3. The ignition module then energizes the spark 

igniter.

4.When sparking begins, the gas valve is energized.

5. If a flame is detected, the gas valve remains open. 

When the call for heat is satisfied, the system con-
trol mechanism de-energizes and the gas valve is 
turned off.

6. If no flame is detected, the gas valve is closed, and 

a purge period begins. After the purge period, the 
ignition module energizes the spark igniter and the 
gas valve. If a flame is still not established, a third 
and final purge/ignition sequence is begun. After 
three failed attempts, the system control mecha-

nism will lock out for a period of one hour or until 
the unit is reset. Reset is accomplished by remov-
ing power from the heater for at least five seconds.

7. With a three-try module, when the flame is estab-

lished and then lost on the first or second trial, the 
gas valve will automatically turn off. A purge and 
trial for ignition will then occur.

Establish that a satisfactorily purged gas supply and 
an electrical supply is available to the heater. 

With the gas supply turned off at the gas valve, and 
the electrical supply isolated by switching off at the 
local switch and removing the appliance electrical 
plug, open the control chamber secured by the four 
screws. Remove the sealing screw from the outlet 
pressure tap with a 3/16" Hex Key Allen Wrench and 
install a test tap and hose. Remove the cover cap 
from the regulator screw with a straight slot screw-
driver through the top hole of the burner. (See Figure 
33).

Turn on appliance gas valve and connect appliance 
electrical plug. Ensure that the timer or thermostat, if 
fitted, is set to call for heat. Switch on power at the 
local switch. If necessary, the sequence as described 
above, in the first and second paragraphs, should 
take place. If not, refer to detailed fault finding 
sequence. When flame is established, check the gas 
pressure reading and adjust if necessary. See data 
label or Page 8, Section 2, for required gas pressure 
setting.

Check the gas pressure at the outlet of the gas valve 
to ensure minimum pressure. See Page 8, Section 
2.9, for required gas pressure settings.

Switch off the electrical supply (shutting down the 
heater), remove pressure gauge and refit plug at out-
let pressure tap, ensuring a tight gas seal. Replace 
cap and regulator screw. Close burner side cover.

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