tekmar 265 Boiler Control - Manual (Page 20)

© 2010 D 265 - 07/10 20 of 36
29 30
Boil
Dem
Com
Dem
24 to 230 V (ac)
30 31
Com
Dem
Setp/
DHW
24 to 230 V (ac)
Aquastat
STEP FOUR
——————
ELECTRICAL CONNECTIONS TO THE CONTROL
General
The installer should test to confirm that no voltage is present at any of the wires. Push the control into the base and slide it down
until it snaps firmly into place.
115 V (dc)
Prim
P1
Power
L
14
N
12 13
N
L
Powered Input Connections
115 V (ac) Power
Connect the 115 V (ac) power supply to the Power L and Power N terminals (13 and 14).
This connection provides power to the microprocessor and display of the control. As
well, this connection provides power to the Prim P1 terminal (12) from the Power L
terminal (13).
Boiler Demand
To generate a Boiler Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the Boil Dem and Com Dem terminals (29 and 30).
DHW Demand
To generate a DHW Demand, a voltage between 24 V (ac) and 230 V (ac) must be
applied across the Setp / DHW Dem and Com Dem terminals (31 and 30). The Boil 3
setting must be set to OFF and DHW MODE must also be set to 1 through 4.
Setpoint Demand
To generate a Setpoint Demand, a voltage between 24 V (ac) and 230 V (ac) must
be applied across the Setp / DHW Dem and Com Dem terminals (31 and 30). The
DHW MODE must also be set to OFF.
External Input (0 -10 V dc)
To generate an external input signal, a voltage between 0 and 10 V (dc) must be
applied to the Com – and Out + terminals (1 and 4).
A 0 - 20 mA signal can be converted to a 0 - 10 V (dc) signal by installing a 500 Ω
resistor between the Com – and Out + terminals (1 and 4).
A 4 - 20 mA signal can be converted to a 2 - 10 V (dc) signal by installing a 500 Ω
resistor between the Com – and Out + terminals (1 and 4).
Output Connections
Primary Pump Contact (Prim P1)
The Prim P1 output terminal (12) is a powered output. When the relay in the control
closes, 115 V (ac) is provided to the Prim P1 terminal (12) from the Power L terminal (13).
To operate the primary pump, connect one side of the primary pump circuit to terminal
(12) and the second side of the pump circuit to the neutral (Power N) side of the
115 V (ac) power supply.
1
Com
–
2
Do Not Apply Power
Boil
Sup
3
Boil
Ret
4
Out
+
0 - 10 V (dc)
or
2 - 10 V (dc)
–
+
1
Com
–
2
Do Not Apply Power
Boil
Sup
3
Boil
Ret
4
Out
+
0 - 20 mA
or
4 - 20 mA
500 Ω
–
+
13 14
115 V (ac)
L
N
Power
L N