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ELECTRICAL CONNECTIONS
AND CONTROLS
GENERAL
General specifications apply to the Gas 310 Eco Pro and to the
Gas 610 Eco Pro. These boilers are supplied as standard with
electronic operating and flame ionisation safety controls with a
specially designed microprocessor at the heart of the system.
The boilers are pre-wired. All external connections can be made
on the terminal strips.
POWER SUPPLY
The boilers are suitable for a 230V-50Hz supply with phase/
neutral/earth. Other connection values are only acceptable if
an isolating transformer is installed. The boilers are sensitive to
phase/neutral and therefore have a facility to ensure that phase
and neutral are correctly connected.
AUTOMATIC CONTROLS
The Gas 310/610 Eco Pro has a unique boiler code. This together
with other data (including boiler type, counter readings, etc.) is
stored in a code-key that belongs to the boiler. If the control unit
is replaced, the counter readings remain stored in the code-key.
MAIN CHARACTERISTICS OF THE CONTROL UNIT
Power supply voltage
Rating of the main fuse F2 (230 VAC)
Fuse rating F1 (230 VAC)
Maximum power consumption of the pump
Mains
NL
PW
F2
M
230 VAC/50Hz
10 AT
2 AT
300 VA
F1
ON/OFF
PUMP
NL
OT
TYPICAL INSTALLATION AND
ELECTRICAL CONNECTIONS AND CONTROLS
TEMPERATURE CONTROL
The boiler is equipped with electronic temperature control
based on flow, return, and boiler block temperature sensors.
The flow temperature can be set between 20 and 90°C.
The boiler reduces its power when the set outlet-temperature
is attained. The cut out temperature is the set heating
outlet-temperature + 5°C.
LOW WATER LEVEL PROTECTION
(FLOW AND CONTENT)
The boiler is fitted with a safety device to prevent the shortage
of water based on temperature measurements (temperature
difference between flow and return).
If Δt = 25K is reached (factory setting), the boiler reduces its
output by modulating to remain in operation as long as possible.
If Δt
25K the boiler goes into part load.
≥
If Δt > 25 + 5K the boiler goes into a normal control stop
(temporary shutdown).
HIGH LIMIT PROTECTION
The maximum temperature protection switches the boiler off
if the water temperature is too high (110°C) and locks it on the
control box. The minimum off time is preset to a fixed value
(*1 seconds). Once the fault has been rectified, the boiler
can be reset by pressing the reset button for two seconds.
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