tekmar 263 Boiler Control - Manual (Page 21)

21 of 36 © 2009 D 263 - 03/09
The 0 to 20 mA output can be converted to 0 to 10 V (dc) using an external 500 Ω
resistor across the Modulation Output terminals (15 and 16).
The 0 to 20 mA output can be converted to 0 to 5 V (dc) using an external 250 Ω resistor
across the Modulation Output terminals.
The 4 to 20 mA output can be converted to a 0 to 135 Ω output for a
Modutrol IV™ gas valve actuating motor using a tekmar 0 to 135 Ω
Converter 005 (sold separately).
The 4 to 20 mA output can be converted to a 0 to 135 Ω output for
a V9055™ gas valve actuating motor using a tekmar 0 to 135 Ω
Converter 005 (sold separately).
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 Com and Out terminals (21 and
23). The outdoor sensor is used by the control to measure the outdoor air temperature.
Boiler Supply Sensor
Connect the two wires from the Boiler Supply Sensor 082 to the Com and Boil terminals
(21 and 22). The boiler supply sensor is used by the control to measure the boiler supply
water temperature.
DHW Sensor
Connect the two wires from the DHW Sensor 082 to the Com and DHW terminals (17 and 19).
The DHW Sensor is used by the control to measure the DHW tank temperature.
™Modutrol IV and V9055 are trademarks of Honeywell, Inc.
Converting the 0 - 20 mA
Output to Operate a
0 - 10 V (dc) Device
15
+
16
–
Mod 1 mA
0-10 V (dc)
Actuating Motor
500 Ω resistor
0 - 20 mA converted
to 0 - 10 V (dc) output
OR
250 Ω resistor
0 - 20 mA converted
to 0 - 5 V (dc) output
Modutrol IV
tekmar
B
R
W
+
-
tekmar
V9055
+
-
B
R
W
Modutrol IV™
0 - 135 Ω
Actuating
Motor
B
R
W
15
Mod 1 mA
+ –
16
Modutrol IV
tekmar
B
R
W
+
-
tekmar
V9055
+
-
B
R
W
15
+
16
–
Mod 1 mA
B
R
W
V9055™
0 - 135 Ω
Actuating
Motor
21
Com
22
Boil
23
Out
22
Boil
21
Com
17
Com
18
UnO
Sw
19
DHW