Watts tekmar 294 User Manual

IOM-T-294 2205 © 2022 tekmar
9
Boiler Sensor (Terminals 6, 7)
The included Universal Sensor 082 can measure the boiler supply temperature of water coming from the boiler
system. This sensor should be installed on the supply pipe ahead of the tees supplying any loads.
• Connect the wires to the boiler sensor terminals 6 and 7.
DHW Sensor (Terminals 8, 9)
A DHW sensor is used to measure the temperature of a DHW tank. For indirect DHW heating, the DHW sensor
can be used instead of a DHW aquastat. For direct DHW heating, only the DHW sensor can be used to control the
temperature of the DHW tank. The DHW Sensor 078 is sold separately.
• Connect the wires to the boiler sensor terminals 8 and 9.
TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE TEMPERATURE RESISTANCE
°F °C
°F °C °F °C °F °C
-50 -46 490,813 20 -7 46,218 90 32 7,334 160 71 1,689
-45 -43 405,710 25 -4 39,913 95 35 6,532 165 74 1,538
-40 -40 336,606 30 -1 34,558 100 38 5,828 170 77 1,403
-35 -37 280,279 35 2 29,996 105 41 5,210 175 79 1,281
-30 -34 234,196 40 4 26,099 110 43 4,665 180 82 1,172
-25 -32 196,358 45 7 22,763 115 46 4,184 185 85 1,073
-20 -29 165,180 50 10 19,900 120 49 3,760 190 88 983
-15 -26 139,403 55 13 17,436 125 52 3,383 195 91 903
-10 -23 118,018 60 16 15,311 130 54 3,050 200 93 829
-5 -21 100,221 65 18 13,474 135 57 2,754 205 96 763
0 -18 85,362 70 21 11,883 140 60 2,490 210 99 703
5 -15 72,918 75 24 10,501 145 63 2,255 215 102 648
10 -12 62,465 80 27 9,299 150 66 2,045 220 104 598
15 -9 53,658 85 29 8,250 155 68 1,857 225 107 553
A good quality test meter capable of measuring up to 5,000
kΩ (1 kΩ = 1000 Ω) is required to measure the sensor resis-
tance. In addition to this, the actual temperature must be
measured with either a good quality digital thermometer, or if a
thermometer is not available, a second sensor can be placed
alongside the one to be tested and the readings compared.
First measure the temperature using the thermometer and then
measure the resistance of the sensor at the control. The wires
from the sensor must not be connected to the control while
the test is performed. Using the chart below, estimate the
temperature measured by the sensor. The sensor and ther-
mometer readings should be close. If the test meter reads a
very high resistance, there may be a broken wire, a poor wiring
connection or a defective sensor. If the resistance is very low,
the wiring may be shorted, there may be moisture in the
sensor or the sensor may be defective. To test for a defective
sensor, measure the resistance directly at the sensor location.
Do not apply voltage to a sensor at any time as damage
to the sensor may result.
Testing the Sensor Wiring
Boiler
67
Sensor
DHW
89
Sensor

Watts tekmar 294 Specifications

General

Brand	Watts
Model	tekmar 294
Category	Controller
Language	English