BLACKHEAT® INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 14: OPERATION
DANGER |
| WARNING |
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Electrical Shock Hazard | Explosion Hazard | Burn Hazard | Cut/Pinch Hazard | |
Disconnect electric | Turn off gas supply to | Allow heater to cool | Wear protective gear | |
heater before service. | before service. | during installation, | ||
before service. | ||||
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| operation and service. | ||
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| Tubing may still be hot | ||
More than one |
| Edges are sharp. | ||
disconnect switch may |
| after operation. | ||
be required to |
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disconnect electric from |
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heater. |
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Heater must be |
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connected to a properly |
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grounded electrical |
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source. |
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Failure to follow these instructions can result in death, electric shock, injury or property damage.
Figure 35: Sequence of Operation Chart
KEY TO
SYMBOLS
Thermostat
Fan
Pressure
P Switch
Neon
Ignition
Gas
Valve
Flame
Sensing
Lockout Alarm
Signal (optional)
T0 | T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 |
P |
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Fan Neon |
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Burner Neon |
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| Tp |
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| Tp |
| Ts |
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| 10 sec |
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| 10 sec |
| 10 sec |
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| 40 sec max. |
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| Interruption of main |
| Burner Lockout | ||
11 sec typical |
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| flame sensing |
| signal received after | |||
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| 3 ignition trial | |
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| failures |
NOTE: If the heater operates for more than 24 hours continuously, the ignition module will automatically recycle the burner to ensure that all safety functions are still in working condition.
14.1 Heater Lockout Indication (Optional)
In case of flame loss during operation of the heater, the burner control unit goes to lockout mode after three ignition trials. At this stage a signal or closed relay will enable the ROBERTS GORDON® controller, BMS
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system, etc. to indicate precisely which heater has failed. This can be done by two options.
