tekmar 157 Difference Setpoint Control - Manual (Page 10)

© 2010 D 157 - 06/10 10 of 16
Item
%
1
2
DIP Switch Settings
Control Settings
Demand: Enable / Disable
The Enable / Disable DIP switch is used to select whether
the demand will enable or disable the control. If a demand is
present, a pointer will be displayed at the bottom right hand
corner of the LCD pointing to the word Demand. Applying
a demand resets any minimum on/off times.
If Enable is selected, the outputs will remain off until the
demand is powered and the control is enabled, allowing
the outputs to operate normally.
If Disable is selected, the outputs will operate normally
until the demand is powered and the control is disabled,
turning off all outputs.
Sensor and Un-powered Input Connections
Do not apply power to these terminals as this will damage
the control.
Source Sensor
Connect the two wires from the Source Sensor 085 to the
Com and Src terminals (1 and 2). The Source Sensor is
used by the 157 to measure the solar collector temperature.
Insert the Solar Sensor 085 into a temperature well, or
alternatively strap the Solar Sensor 085 on the outlet pipe
close to the heat source with a stainless steel clamp.
Storage Sensor
Connect the two wires from the Storage Sensor 071
to the Com and Stor terminals (1 and 3). The Storage
Sensor is used by the 157 to measure the Storage tank
temperature.
Auxiliary Sensor
The auxiliary sensor can only be used when the control is
in either mode 3, heat supplement, or mode 4, heat dump.
The 157 will auto detect when an auxiliary sensor is wired
to terminals 1 and 4.
Connect two wires from the Auxiliary Sensor 071 to the Com
and Aux terminals (1 and 4). The Auxiliary Sensor is used
by the 157 to measure either the heat dump temperature
or the upper storage tank temperature.
S
o
l
a
r
C
o
l
l
e
c
t
o
r
Do not apply power
1 2 3 4
Com Src Stor Aux
Auxiliary
Heat
From
Collector
Do not apply power
1 2 3 4
Com Src Stor Aux
Mode 3
Heat
Dump
From
Collector
Do not apply power
1 2 3 4
Com Src Stor Aux
Mode 4