tekmar 161 Setpoint Control Installation - Manual (Page 19)

19 of 32 © 2007 D 161 - 08/07
Application Mode 1 is a generic setpoint
control operation using an on/off
differential for heating. The sensor is
required to be located at the temperature
control point. The setpoint control can
have an occupied temperature setting.
The setpoint load is not heated during
the unoccupied or away periods.
Application Mode 2 is designed
specifically to heat hot tubs using
an on/off differential. A sensor must
be located in a temperature well on
the recirculation pipe. The hot tub
can have an occupied temperature
setting.
Sequence of Operation
Application Mode 1 - On / Off Setpoint SECTION A
Load
Application Mode 2 - Hot Tub SECTION B
Relay 1 Operation
Relay 1 operates using an on/off differential to maintain the load at the Occupied
temperature. During the Unoccupied period, Relay 1 is operated to maintain 10°F
(5.5°C) less than the Occupied temperature setting. During the Away scene, Relay
1 is operated to maintain the Hot Tub at 50°F (10.0°C).
Relay 1 Operation
Relay 1 operates using an on/off differential to maintain the load at the Occupied
temperature. Relay 1 does not operate during the Unoccupied or Away periods.
Setting the Setpoint Off
The setpoint temperature can be set to Off. When set to Off, Relay 1 will not turn on.
If the heating area is outdoors, or the heating system has the potential to freeze, it is
recommended that the setpoint always be set to a temperature and not set to Off.
The setpoint can be set to Off if the heating system can be drained or the pump
should remain off.
The setpoint control power should never be shut off, otherwise an error message
will appear on the rest of the tN4 system.