User manual

Page 27
9-10 EMPTY
11-12 EXTERNAL WATER PRESSURE SWITCH
A water pressure sensor is mounted in the boiler. As an option an external water pressure switch can be
installed. The sensor can be replaced by the water pressure switch, which can be wired to the terminals.
When terminals 11-12 are not bridged/made, the boiler will lock-out.
PARAMETER: A parameter change is needed.
13-14 ON/OFF CONTROL
OPTION 1: An ON/OFF thermostat can be connected. The boiler will use the set/programmed flow tem-
perature for the heating system when these terminals 13 and 14 are bridged/made.
15-16 0-10 VDC CONTROL SIGNAL
These terminals are used for an external 0-10 VDC control signal. PARAMETER: A parameter change is
needed. REMINDER: Terminal 15 [+] (positive) and Terminal 16 [-] (negative). 0 volts is off 10 volts is
the maximum set temperature
17-18 CASCADE CONNECTION
These connections are used when boilers are cascaded with the internal cascade manager for control-
ling the total cascade. REMINDER: Connect all terminals 17 and all terminals 18 together, do not switch
between these terminals.IE 17 to 17 and 18 to18 daisy chain
19-20 LOCK-OUT
This contact is N.O. (normally open). When the unit is in lock-out this contact will close.
21-22 BURNER FIRING
This contact is N.O. (normally open). When the unit starts the burner and detects the flame, this contact
will be closed. This contact can also be used to control an external (extra) boiler (PARAMETER: A pa-
rameter change is needed).
23-24 BURNER DEMAND
This contact is N.O. (normally open). When the unit receives any heat demand this contact will close.
25-26-27 CH SYSTEM PUMP P3
Connection for a central heating system pump (P3).Relay required at extra cost
28-29-30-31 HWS DIVERTER VALVE for CALORIFIER
When using a calorifier/hot water tank, a 3-way valve or a pump (P2) (relay required at extra cost) can
be used to divert hot water to the heating coil of the calorifier/tank. This 3-way valve will open, when the
hot water storage tank/calorifier has a heat demand.
PARAMETER: A parameter change is needed.
28 = L2 wire (heating position); 29 = Neutral wire; 30 = Ground wire; 31 = L1 wire (hot water position).
29-30-31 CALORIFIER PUMP P2
When using a calorifier/hot water tank, a 3-way valve or a pump (P2) (see above) can be used to divert
hot water to the heating coil of the calorifier/tank. This pump will start when the hot water storage tank/
calorifier creates a hot water demand. PARAMETER: A parameter change is needed.
32-33-34 POWER SUPPLY
The power supply connection of the unit. 32 = Live; 33 = Earth 34 = Neutral