tekmar 279 Steam Control - Manual (Page 8)

© 2010 D 279 - 05/10 8 of 24
Optional Indoor Sensors Section F
Multiple indoor sensors can be added to improve the
temperature accuracy within the building. Available indoor
sensors include the 076, 077 and 084.
The control allows two indoor sensors to be directly
connected to the control. Once an indoor sensor is
connected to the indoor sensor S1 input, the Indoor S1/Off
switch setting must be set to S1. Likewise, once an indoor
sensor is connected is connected to the S2 input, the Indoor
S2 /Off switch setting must be set to S2.
When indoor sensor 1 is present, the Room 1 temperature
is visible in the View menu. Likewise, when indoor sensor
2 is present, the Room 2 temperature is visible in the View
menu. Also shown in the View menu is the current Room
Target temperature. The room target can be changed by
adjusting the Room Occupied or Room Unoccupied setting
in the Adjust menu.
Indoor Sensors 084, 077 and 076
When using two indoor sensor inputs, the control can
operate either based upon an average of the two temperature
measurements or the control can operate on the lowest of
the two temperature measurements.
Temperature Averaging
To operate the steam system based upon the average of
the two indoor sensor temperature measurements, set the
Average / Off switch setting to Average.
Lowest of Two Temperatures
To operate the steam system based upon the lowest of
the two indoor sensor temperature measurements, set the
Average / Off switch setting to Off.
Should additional indoor sensors be desired, a square
number (4, 9, 16, etc.) of sensors can be wired in series-
parallel to a single indoor sensor input.
To Indoor Sensor Input
Built-in Timer Section G
The control includes a built-in time clock that is turned on once the Setback /Off switch setting is set to Setback. The time
is set in the Time menu. The clock can be set to use either 12 or 24 hour time.
Programmable Schedule Section H
The control includes a programmable schedule that is
turned on once the Setback /Off switch setting is set to
Setback. The programmable schedule is set in the Schedule
menu. The schedule can be repeated on a 24 hour, 5-1-1,
or 7 day schedule. Each schedule allows a time to be set for the Occupied event and another time to be set for the
Unoccupied event. Should it be desired to skip an Occupied
or Unoccupied event, set the event time to --:--, which can be
found between 11:50 PM (23:50) and 12:00 AM (0:00).
Warm Weather Shut Down Section I
The control includes a Warm Weather Shut Down (WWSD)
setting in the Adjust menu. When the Setback /Off switch
setting is set to Setback, the control includes WWSD Occupied
and WWSD Unoccupied settings. Once the measured outdoor air temperature exceeds the
WWSD setting, the steam system is automatically shut down.
Once the measured outdoor air temperature falls below the
WWSD, the control is able to start a new heating cycle.
Series - Parallel
Wiring