43
1002595 ISSUE 5 M172 VARIHEAT
Fire Alarm interface – terminals 1/2
For activating Standby mode in e event of a fire alarm. To enable e Variheat
to run normally, e remote switch should be closed. To put e Variheat into
Standby mode, e remote switch should be open. The remote switch should
be volt free and suitable to switch 230V. An alarm will show on e control
system when e fire alarm is activated.
If e fire alarm interface is required, e factory-fitted link wire should be
removed.
If is facility is not required, e factory-fitted link wire should be le in place.
“Boiler Go” demand – terminals 6/7
For remote indication at e Variheat LPHW heat exchangers are in operation,
used to indicate at e Variheat requires LPHW to provide supplementary
heating. This could be used to control a boiler, LPHW pump, LPHW control
valve, or BMS – whichever are required to enable LPHW flow to e Variheat.
These are volt free contacts rated at 0.5A at 230V. Contacts close when LPHW
is required.
If e LPHW supply to e Variheat is to be activated by e Variheat control
system, ese terminals should be used to enable e LPHW supply. The
specifics of is connection depend on e design of e LPHW system design.
If e LPHW supply to e Variheat is not dependent on demand from e
Variheat control system, ese terminals do not need to be used.
“Time clock override” (remote Occupied/Unoccupied) – control
terminals 10/11
For remote control of e Variheat Occupied/Unoccupied mode.
To enable Occupied mode, e remote switch should be closed. To enable
Unoccupied mode, e remote switch should be open. These terminals can be
connected to a user switch, pool cover micro-switch, BMS, or whatever system
determines e usage mode of e pool. The remote switch should be volt free
and suitable to switch 24Vdc.
If remote control of Occupied/Unoccupied is to be used, e User interface
should be set to Unoccupied. (See User Settings.)
If is facility is not required, ese terminals do not need to be used.
“Remote On/Off” – terminals 12/13
For remote control of On/Standby. To enable Variheat to run, e remote switch
should be closed. To set e Variheat to Standby, e remote switch should be
open. The remote switch should be volt free and suitable to switch 24Vdc.
Refer to Standby button function in e User instructions.
If remote On/Off control is required, e factory-fitted link wire should be
removed.
If is facility is not required, e factory-fitted link wire should be le in place.
“Volt free” status signals – terminals 16/17/18
For remote status indication. These are shared volt free contacts rated at a
maximum combined 0.5A at 230V.
Terminal 16 – Common.
Terminal 17 – Variheat On. Contacts close when Variheat is On.
Terminal 18 – Fault. Contacts close when a fault is active.
If is facility is not required, ese terminals do not need to be used.
“Remote Damper” control – terminals 63/64/65
(See page 44.)
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