Roberts Gorden BH30ST/EF User Manual

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A 230 V signal is provided which enables the ROBERTS 
GORDON

®

 controller, BMS system, etc. to indicate the 

heater that has failed. An additional wire has to be 
installed from the heater lockout indicator connector to 
the monitoring computer. 

A volt free contact relay is closed which enables the 
ROBERTS GORDON

®

 controller, BMS system, etc. to 

indicate the heater that has failed. An additional wire has 
to be installed from the heater volt free  connector to the 
monitoring computer. 

See Page 57, Section 13.5.

Establish that a satisfactory purged gas supply and an 
electrical supply is available to the heater. Ensure that all 
time clocks and thermostats are set to call for heat.

With the gas supply cut off at the appliance isolating cock 
and the electrical supply isolated by switching off at the 
local switch and removing the appliance inlet plug, open 
the control chamber secured by the two screws. Loosen 
the sealing screw from the pressure test point and 
remove the cover cap from the governor.

Turn on the gas supply and connect appliance electrical 
plug. Ensure that the timer or thermostat, if fitted, are set 
to call for full gas rate. Switch on at the local switch. The 
sequence as described should take place. If not, refer to 
detailed fault finding sequence. When flame is 
established, check the gas pressure reading and adjust if 
necessary. Refer to burner data label.

Check the gas pressure at the outlet of the gas valve. 

Page 74, Section 18.9.1 or See Page 75, Section 18.9.2 
for pressure settings or refer to the data plate. 

Switch off the electrical supply (shutting down the heater), 
remove pressure gauge - tighten pressure test point 
screw, ensuring a tight gas seal. Replace governor cover 
cap. Close burner side cover.

1. Establish that a satisfactory purged gas supply and 

an electrical supply is available to the heater. 

2. ENSURE that all the dampers are in the fully open 

position.

3. With the gas supply off at each of the burners and 

the electrical supply isolated, open the control 
chamber secured by two self tapping screws.

4. Ensure that all time clocks and thermostats are set 

to call for heat.

5. Switch on the electrical supply at the main isolator. 

This will start the exhaust fan.

6. Balancing Cold Vacuum

Check each burner vacuum by connecting an 
inclined pressure gauge to the tee on the pressure 
switch inlet side in the burner. Adjust the damper so 
that the vacuum is 1.9 mbar. Repeat for each burner.

7. Starting at the end burner (furthest from the exhaust 

fan), with the inclined pressure gauge connected as 
described above. Turn on the gas supply and con-
nect appliance electrical plug, reset the pressure 
switch by removing vacuum from the inlet side of the 
pressure switch waiting several seconds and recon-
necting. The start up sequence described on 

58, Section 14 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.
Check the gas pressure at the outlet of the gas 
valve. 

Section 18.9.2 for pressure settings or refer to the 
data plate.
Switch off the electrical supply (shutting down the 
heater), remove pressure gauge - refit pressure test-
point screw, ensuring a tight gas seal. Replace gov-
ernor cover cap.
Repeat this procedure for each burner in the sys-
tem.
Close the control chamber and secure with two 
sheet metal screws.

8. Balancing Hot Vacuum

Reconnect all the burners on the system and allow 
them to reach full operating temperature (approxi-
mately 20 minutes). Return to each burner and 
recheck the hot vacuum at the tee on the inlet to the 
pressure switch. Readjust the damper so that the 
hot vacuum of 1.5 mbar (2.0 mbar for BH40EF) is 
achieved and lock the damper in position.

Switch on again at the local switch to ensure smooth 
ignition. Carry out the following system checks:
When running, turn off the gas supply at the appliance. 
The heater will immediately shut down followed by three 
ignition attempts followed by lockout.
Linear and Double Linear only:
When running, disconnect the fan plug from the burner. 
The unit should shut down within three seconds, proving 
operation of the pressure switch.

After satisfactory testing, ensure that the client is fully 
aware of the operation of the system. Bring this manual to 

Connector male - Lockout Indicator

91324000

Connector female - Lockout Indicator

91324001

Wire Blue 12"

91300011

Wire Brown 12"

91300012

Connector male - Volt Free

91324000

Connector female - Volt Free

91324001

Wire Blue 7"

91300004

Wire Brown 7"

91300005

Wire Yellow 12"

91300003

Screw #8 x 3/8 Hex Wshr PHH Type 23

94961406

Base relay P2RF05E

C1050B

Relay G2R1-SN IMO 220 V 10 A

C1049B