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General
The water heater controller is designed to function as a standalone control unit for intermittent operation on heat-
ing appliances with a premix (modulating) burner and a pneumatic air-gas system.
Flame establishing period
Fuses
Safety time
Ignition attempts
Pre-purge time
Pre-ignition time
Flame failure response time
Flame-current
1
Cable length AL-BUS
1)
This consists the total length of the cable, not the length between two water heaters. The length differs with the diameter
of the cable.
P
14.7.1
UMP START EVERY
To protect the pump from getting stuck at a certain position it is forced to run for 10 seconds every 24 hours. This
is done only for the water heater loop pump at the start-up of the board.
F
14.7.2
ROST PROTECTION
The Frost protection function protects the water heater and water heater loop from freezing.
The T_Supply and T_Return sensors are checked for generating a Frost protection demand.
• When any of the sensors drop below FP_Start_Pump the water heater loop pump is switched ON.
• When any of the sensors drop below FP_Start_Burn the water heater is fired.
• When all of the sensors measure above FP_Stop the Frost protection demand is ended.
When the demand for Frost protection is ended the pumps will post-circulate for DHW_Pump_Overrun.
Parameters are factory set: FP_Start_Pump is set at 10°C (50°F) and FP_Start_Burn is set at 5°C (41°F)
Ignition cycle
During the ignition cycle multiple safety checks are active
The table below shows the states of the burner ignition cycle, as shown in the diagram above:
80
Mains input
V
Minimum
Start-detection
24
HOURS
E93.1804.014
1 x 5AT, 230V
2 seconds
5 seconds
5
≥ 2...60 seconds (not safety critical)
2 seconds (not safety critical)
< 1.0 second
1.0 μA
1.5 μA
2
mm
(AWG)
Cable length m (ft)
0.25
(23)
100 (328.1 ft)
0.5
(20)
200 (656.2 ft)
0.75
(18)
300 (984.3 ft)
1.0
(17)
400 (1312.3 ft)
1.5
(15)
600 (1968.5 ft)
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