tekmar 275 Boiler Control User Manual
Page 29
29 of 48
© 2012 275_D - 11/12
Rotate / Off
Use the Rotate / Off DIP switch to enable the Equal Run
Time Rotation feature. This feature Changes the firing
order of the boilers in order to maintain a similar amount of
running time on each boiler. If set to Off, the firing sequence
if fixed starting with boiler 1 to boiler 4.
Setback BTC I
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
BTC I / Off
Use the BTC I / Off DIP switch when the 275 is wired to
boilers with BTC I (Boiler Temperature Control series I)
controls.
If wired to BTC I controls, set the DIP switch to BTC I.
If not wired to BTC I controls, set the DIP switch to Off.
Setback
BTC I
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
Pump Sequencer / Off
Use the Pump Sequencer / Off DIP switch to activate
primary pump sequencing. DHW operation is not available
when Pump Sequencer is selected.
If set to Pump Sequencer, the control operates primary
pumps 1 & 2 in stand-by mode.
If set to Off, the control operates primary pump 1 and the
pump 2 relay is then available for a DHW pump.
Setback BTC I
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
•
•
•
•
Fixed Last / Off
Use the Fixed Last / Off DIP switch to exclude the last boiler
in the rotation sequence. This DIP is only active when the
Rotate / Off DIP is set to Rotate.
If set to Fixed Last, the last boiler is always the last to fire.
Fixed Last will only work for boilers wired to the Relay 4
terminals (19 and 20).
Setback BTC I
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
Fixed Lead / Off
Use the Fixed Lead / Off DIP switch to exclude the first
boiler in the rotation sequence. This DIP is only active
when the Rotate / Off DIP is set to Rotate.
If set to Fixed Lead, the first boiler is always the first to fire.
Fixed Lead will only work for boilers wired to the Relay 1
terminals (13 and 14).
Setback BTC I
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
First On / Last Off or First On / First Off.
The First On / Last Off or First On / First Off DIP switch
selects whether the first boiler is the first to fire and the
last to shut off or the first to fire and the first to shut off.
This DIP switch is only active when the Rotate / Off DIP
switch is set to Rotate and the Fixed Lead / Off DIP switch
is set to Fixed Lead.
Setback BTC I
Off
EMS
Rotate
Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
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•
•
•
•
•