Roberts Gorden Blackheat BH15ST, Installation, Operation & Service Manual

Page: 65 / 84

SECTION 14: O
PERATION
59 of 75
SECTION 14: OPERATION
Fi g ure 35: Se q uence of Operation Chart
NOTE: If the heater operates for more than 24 ho u rs contin u o u sly, the ignition mod u le w ill a u tomatically recycle the
b u rner to ens u re that all safety f u nctions are still in w orking condition.
14.1 Heater Lockout Indication (Optional)
In case of flame loss d u ring operation of the heater, the
b u rner control u nit goes to locko u t mode after three
ignition trials. At this stage a signal or closed relay w ill
enable the ROBERTS GORDON
®
controller, BMS
system, etc. to indicate precisely w hich heater has failed.
This can be done by t w o options.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
More than one
disconnect switch may
be required to
disconnect electric from
heater.
Heater must be
connected to a properly
grounded electrical
source.
P
P
Fan N eon
Burner N eon
N eon
Ignition
Gas
V alve
Flame
Sensing
Pressure
Switch
Fan
Thermostat
KEY TO
SYMBOLS
T0 T1 T2 T3 T4 T5 T6 T7
10 sec
Tp
40 sec max.
Interruption of main
Tp
10 sec
Ts
10 sec
flame sensing
11 sec typical
T 8
Lockout Alarm
Signal (optional)
Burner Lockout
signal received after
3 ignition trial
failures