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1002595 ISSUE 5 M172 VARIHEAT
Fire Alarm interface – terminals 1/2
For activating Standby mode in the event of a fire alarm. To enable the Variheat
to run normally, the remote switch should be closed. To put the Variheat into
Standby mode, the remote switch should be open. The remote switch should
be volt free and suitable to switch 230V. An alarm will show on the control
system when the fire alarm is activated.
If the fire alarm interface is required, the factory-fitted link wire should be
removed.
If this facility is not required, the factory-fitted link wire should be left in place.
“Boiler Go” demand – terminals 6/7
For remote indication that the Variheat LPHW heat exchangers are in operation,
used to indicate that the 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 the Variheat.
These are volt free contacts rated at 0.5A at 230V. Contacts close when LPHW
is required.
If the LPHW supply to the Variheat is to be activated by the Variheat control
system, these terminals should be used to enable the LPHW supply. The
specifics of this connection depend on the design of the LPHW system design.
If the LPHW supply to the Variheat is not dependent on demand from the
Variheat control system, these terminals do not need to be used.
“Time clock override” (remote Occupied/Unoccupied) – control
terminals 10/11
For remote control of the Variheat Occupied/Unoccupied mode.
To enable Occupied mode, the remote switch should be closed. To enable
Unoccupied mode, the remote switch should be open. These terminals can be
connected to a user switch, pool cover micro-switch, BMS, or whatever system
determines the usage mode of the pool. The remote switch should be volt free
and suitable to switch 24Vdc.
If remote control of Occupied/Unoccupied is to be used, the User interface
should be set to Unoccupied. (See User Settings.)
If this facility is not required, these terminals do not need to be used.
“Remote On/Off” – terminals 12/13
For remote control of On/Standby. To enable Variheat to run, the remote switch
should be closed. To set the Variheat to Standby, the remote switch should be
open. The remote switch should be volt free and suitable to switch 24Vdc.
Refer to Standby button function in the User instructions.
If remote On/Off control is required, the factory-fitted link wire should be
removed.
If this facility is not required, the factory-fitted link wire should be left 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 this facility is not required, these terminals do not need to be used.
“Remote Damper” control – terminals 63/64/65
(See page 44.)
Summary of Contents for Variheat AA1200
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