tekmar 284 Boiler Control - Manual (Page 30)

© 2014 284_D - 08/14 30 of 60 A Watts Water Technologies Company
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
Testing the Sensor Wiring
A good quality test meter capable of measuring up to 5,000 kΩ
(1 kΩ = 1000 Ω) is required to measure the sensor resistance. 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 & the readings compared.
First measure the temperature using the thermometer & 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 & thermometer 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.
Wiring the tekmarNet ® Devices
tN4 Boiler Bus b Terminals 32 - 33
Terminals 32 & 33 provide communication for tN4 devices on the tN4 Boiler Bus b. Connect terminals 32 (tN4) & 33 (C0) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 32 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 33 (C0) is connected to the C terminal on the tN4 device.
tN4 Boiler Bus 1 Terminals 34 - 35
Terminals 34 & 35 provide communication for tN4 devices on the tN4 Boiler Bus 1. Connect terminals 34 (tN4) & 35 (C1) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 34 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 35 (C1) is connected to the C terminal on the tN4 device.
tN4 Boiler Bus 2 Terminals 36 - 37
Terminals 36 & 37 provide communication for tN4 devices on the tN4 Boiler Bus 2. Connect terminals 36 (tN4) & 37 (C2) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 36 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 37 (C2) is connected to the C terminal on the tN4 device.
tN4 Boiler Bus 3 Terminals 38 - 39
Terminals 38 & 39 provide communication for tN4 devices on the tN4 Boiler Bus 3. Connect terminals 38 (tN4) & 39 (C3) to the
corresponding terminals on the tN4 devices that are to be connected.
The connection is polarity sensitive. Ensure that terminal 38 (tN4) is connected to the tN4 terminal on the tN4 device &
that terminal 39 (C3) is connected to the C terminal on the tN4 device.