tekmar 261 Boiler Control User Manual
Page 10
Copyright © D 261 - 0
3/09
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Setpoint Demand
To generate a setpoint demand, a voltage between 24 V (ac) and 240 V (ac) must be
applied across the
Setpoint Demand terminals (3 and 4).
Output Connections
Boiler Pump Contact (
Boil Pmp)
The boiler pump output terminal (7) on the 261 is a powered output.
When the relay contact in the 261 closes, 120 V (ac) line (L) is
provided to the
Boil Pmp terminal (7) from the Power L terminal (5).
To operate the boiler pump, connect one side of the boiler pump to
terminal 7 and the second side of the pump circuit to the neutral (
N)
terminal 8.
Boiler Contacts
The
Stage 1 and Stage 2 terminals (9, 10 and 11, 12) are isolated outputs in the 261.
There is no power available on these terminals from the control. These terminals are
to be used as a switch to either make or break the boiler circuit. When the 261 requires
the boiler(s) to fire, it closes the contact between terminals 9 and 10 and / or 11
and 12.
Sensor and Unpowered Input Connections
Do not apply power to these terminals as this will damage the control.
Outdoor Sensor
Connect the two wires from the Outdoor Sensor 070 to the
Out and Com terminals
(16 and 17). The outdoor sensor is used by the 261 to measure the outdoor air
temperature.
Boiler Sensor
Connect the two wires from the Boiler Sensor 0
82 to the Boil and
Com terminals (15 and 17). The boiler sensor is used by the 261 to
measure the supply (outlet) water temperature from the boiler.
15
Boil
Out
16
17
Com
Boiler
sensor
5
6
Power
Boil
Pmp
7
8
N
120 V (ac)
L
N
L
N
Boiler
pump
9
10
Stage
11 12
1
1
Stage
2
2
T
T
T
T
T
T
T
T
16 17
Out Com
3
4
Setpoint
Demand
24 to 240 V (ac)