TAC AB, Feb 2000
4:11
Special functions, P:16 -
TAC 200 User’s Manual
4.9 Time control of external units
Time program 2 (section 3.2) may be used to control external units via relay
output K4, quite independent of the Day/Night time operation of Time
program 1.
For example, switch-over between oil and electrical heating, lighting or fans
may be controlled in this way.
Filled segments (P:11, 0-24) indicate an active output.
4.10 Pump control
The pump is operated to utilize the heat stored in the building in the most
efficient manner.
The pump is stopped (and the control valve is closed) when:
– the outdoor temperature rises above a preset value.
– the calculated supply temperature falls below a preset ”cut-off” limit.
These conditions are set by
P:44 Outdoor temperature for pump stop
P:45 Supply temperature for pump start
Note ! This cut-off function is only in operation if
P:42 Pump cut-off
is set to 1.
The minimum off time after the pump has been stopped is
P:46 Min off time pump (hours)
Once initiated, the period must run out, even if P:46 is changed during this
period.
Exercising of pump
The pump is run once a week, provided that
P:43 Pump exercise
is set to 1. The pump is started at midday each monday and run for one minute
to prevent seizure, during stops longer than a week. However, the pump must
have stood still for at least a full week, before the pump is exercised.
Anti-freeze protection
The pump will start running to prevent freezing when the outdoor temperature
falls below 3°C. This facility cannot be inhibited.
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