tekmar 162 Setpoint Control Installation - Manual (Page 21)

21 of 32 © 2007 D 162 - 08/07
Pressing the UP button while in the VIEW menu
starts operation of the Hot Tub for the time set.
To Stop operation press the DOWN button until
the time shows OFF.
Occupied Time
The setpoint control can temporarily override the scheduled
temperature and operate at the occupied temperature on
a timer.
Press the Up or Down buttons while in the View menu
to set the amount of time that the occupied temperature
should remain in effect.
To use this feature, a programmable schedule must be set
or the schedule be set to normally operate at the unoccupied
setting. When the schedule is set to unoccupied, the
setpoint control operates at the unoccupied setting until
activated.
The length of time the setpoint remains at the occupied
temperature is preset by the Run Time Occupied item
located in the Scene menu.
To cancel the temporary occupied time, press and hold the
Down button until the display shows OFF, at which point,
the setpoint control returns to the schedule.
Application Mode 3 is designed specifically to operate a
domestic hot water (DHW) tank using an on/off differential.
A sensor must be located in a temperature well inside
the DHW tank. The DHW tank can have an occupied,
unoccupied, and away temperature setting.
Application Mode 3 - DHW Tank SECTION C
Relay 1 Operation
Relay 1 operates using an on/off differential to maintain the
load at the Occupied, Unoccupied, or Away temperatures
depending on the schedule and scene.
Relay 2 Operation
Relay 2 operates a DHW recirculation pump continuously
during the occupied period.
Relay 2 remains off during the unoccupied and away
periods.
Application Mode 4 is a generic setpoint control operation
using pulse width modulation for heat or cooling. The sensor
is required to be located at the temperature control point.
The setpoint control can have an occupied, unoccupied,
and away temperature setting.
Load
Application Mode 4 - PWM Setpoint SECTION D
Relay 2 Operation
Relay 2 operates continuously while in the occupied period
to provide constant circulation and reduce temperature
swing.
Relay 2 operates together with Relay 1 while in the
unoccupied and 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.
Relay 1 Operation
Relay 1 operates using pulse width modulation to maintain
the load at the Occupied, Unoccupied, or Away temperatures
depending on the schedule and scene.