Radiant BH15ST Installation, operation & service manual - page 65
SECTION 14: O
PERATION
59
14.2 Testing
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. See
Page 73, Section 18.9.1 or See Page 74, 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.
14.3 Commissioning (Multiburner)
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 Suction
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 suction 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 suction from the inlet side of the
pressure switch waiting several seconds and recon-
necting. The start up sequence described on Page
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. See Page 73, Section 18.9.1 or See Page 74,
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
testpoint screw, ensuring a tight gas seal. Replace
governor 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 Suction
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 suctions at the tee on the inlet to the
pressure switch. Readjust the damper so that the
hot suction of 1.5 mbar (2.0 mbar for BH40EF) is
achieved and lock the damper in position.
14.4 System Checks
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.
14.5 User Instructions
After satisfactory testing, ensure that the client is fully
aware of the operation of the system. Bring this manual to
the attention of the user or purchaser; instruct them in the
safe operation of the heater(s). Advise the user that if the
system is unflued, any reduction in the natural ventilation
of the building may require a flue to be fitted, or additional
ventilation grilles will be required.