tekmar 284 Boiler Control - Manual (Page 26)

© 2014 284_D - 08/14 26 of 60 A Watts Water Technologies Company
The temperature sensor (thermistor) is built into the
sensor enclosure.
Remove the screw & pull the front cover off the
enclosure.
The sensor can either be mounted directly onto a wall or
a 2" x 4" electrical box. When the senor is wall mounted,
the wiring should enter through the back or bottom of
the enclosure. Do not mount the sensor with the conduit
knockout facing upwards as rain could enter the enclosure
& damage the sensor. •
•
In order to prevent heat transmitted through the wall from
affecting the sensor reading, it may be necessary to install
an insulating barrier behind the enclosure.
The Outdoor Sensor should be mounted on a wall which
best represents the heat load on the building (a northern
wall for most buildings & a southern facing wall for buildings
with large south facing glass areas). The sensor should not
be exposed to heat sources such as ventilation or window
openings.
The sensor should be installed at an elevation above the
ground that will prevent accidental damage or tampering. •
•
•
Mounting the Outdoor Sensor -------------------------------------------------------------------------- --------------------------------------------------------------------------
Sensor with bottom
entry wiring Sensor with rear
entry wiring Sensor mounted
onto 2" x 4"
electrical box
Sensor Installation & Wiring
Mod Enable
T T + -
51 52
Mod
Boiler 1
53 54
Stage 1 Stage 2
55 56
+ -
Modulating Boiler Wiring Terminals 51 to 72
For modulating boilers that do not require an enable:
The 284 provides either a 4-20 mA or a 0-10 V (dc) output to each boiler.
Polarity is important.
Connect the Mod + terminals from boilers 1, 2, 3 and 4 to the 284 terminals 51, 57, 63 and 69,
respectively.
Connect the Mod - terminals from boilers 1, 2, 3 and 4 to the 284 terminals 52, 58, 64 and 70,
respectively.
Some modulating boilers may also require an on / off signal in addition to the modulating
signal. See the Stage 1 terminals for boilers 1, 2, 3 and 4.
•
•
•
•
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
284
Boiler
Control
284
Modutrol IV™ and V9055™ are trademarks of Honeywell, Inc.