Watts tekmar 294 - Boiler Output and Enable Wiring; Modulating Boiler Output Wiring; Boiler Enable Wiring

12
IOM-T-294 2205 © 2022 tekmar
Modulating Boilers (Terminals 25 to 32)
The control provides either a 0-10 V (dc) or a 4-20 mA output to each boiler. Polarity is important.
• Connect the control Mod (+) terminals 25, 27, 29, 31 to boilers 1, 2, 3 and 4 analog signal input
(+) respectively.
• Connect the control Mod (-) terminals 26, 28, 30, 32 to boilers 1, 2, 3 and 4 analog signal input
(-) respectively.
Some modulating boilers may also require a boiler on/off enable signal in addition to the
modulating signal. Please consult the boiler manual.
Modutrol IV
tekmar
B
R
W
+
-
tekmar
V9055
+
-
B
R
W
Modutrol IV™
0 - 135 Ω
Actuating
Motor
B
R
W
Mod
+
-
Modutrol IV
tekmar
B
R
W
+
-
tekmar
V9055
+
-
B
R
W
B
R
W
V9055™
0 - 135
Ω
Actuating
Motor
Mod
+
-
The 4 to 20 mA output can be converted to a 0 - 135 Ω
output for a Modutrol IV™ gas valve actuating motor using a
0 - 135 Ω tekmar Converter 005 (sold separately).
The 4 to 20 mA output can be converted to a 0 - 135 Ω
output for a V9055™ gas valve actuating motor using a
0 - 135 Ω tekmar Converter 005 (sold separately).
Boiler
Control
294
Boiler
Control
294
Modutrol IV™ and V9055™ are trademarks and products of Honeywell International, Inc.
Boiler Enable (Terminals 33 to 40)
A single stage condensing or non-condensing boiler is enabled through the TT contacts.
• For Boiler 1 connect the Boiler Enable terminals 33 and 34 to the boiler TT contacts.
• For Boiler 2 connect the Boiler Enable terminals 35 and 36 to the boiler TT contacts.
• For Boiler 3 connect the Boiler Enable terminals 37 and 38 to the boiler TT contacts.
• For Boiler 4 connect the Boiler Enable terminals 39 and 40 to the boiler TT contacts.
-
+
Boiler 1
25 26
+ Mod -
T
T
Boiler 1
33 34
Enable