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107774-02- 4/18
Figure 11.1: Location of High and Low Voltage Field Electrical Connections
XI. Wiring
(continued)
2. Low Voltage Connections – Commonly used low voltage field connections are located on the low voltage PCB
and are shown in Figure 11.3 and listed from left to right:
1 Heat T’Stat - 24VAC heating thermostat
2 Heat T’Stat - 24VAC heating thermostat
3 DHW Stat - No field connection
4 DHW Stat - No field connection
5 External Limit - Field supplied low voltage safety limit contacts (1)
6 External Limit - Field supplied low voltage safety limit contacts (2)
7 Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (1)
8 Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (2)
External power must not be applied to any of the low voltage terminals - doing so may damage the boiler control.
Also note the following:
a. External Limit - The external limit terminals are intended for use with a field supplied safety device,
such as a manual reset high limit or low-water cut-off. When an external limit is used, the jumper
between these two terminals must be removed. Failure to remove this jumper will render the external
safety devices ineffective.
b. Outdoor Sensor - Use only the Tasseron TSA00AA outdoor sensor supplied with the boiler. When
this sensor is connected and enabled, the boiler will adjust the target supply water temperature
downwards as the outdoor air temperature increases. This sensor should be located on the out
side of the structure in an area where it will sense the average air temperature around the house.
Avoid placing this sensor in areas where it may be covered with ice or snow.
In general, locations where the sensor will pick up direct radiation from the sun should also be
avoided. Avoid placing the sensor near potential sources of electrical noise such as transformers,
power lines, and fluorescent lighting. Wire the sensor to the boiler using 22 gauge or larger
wire. As with the sensor itself, the sensor wiring should be routed away from sources
of electrical noise. Where it is impossible to avoid such noise sources, wire the sensor using a 2
conductor, UL Type CM, AWM Style 2092 shielded cable. Connect one end of the shielding on this
cable to ground. See Section XIII of this manual for information on enabling the outdoor reset sensor.
Summary of Contents for K2WTC-135
Page 81: ...81 107774 02 4 18 X Domestic Hot Water Piping continued Figure 10 1 Domestic Hot Water Piping...
Page 89: ...89 107774 02 4 18 XI Wiring continued...
Page 90: ...90 107774 02 4 18 Figure 11 8 Internal Wiring Connections Diagram XI Wiring continued...
Page 101: ...101 107774 02 4 18 Lighting and Operating Instructions XII Start Up and Checkout continued...
Page 142: ...142 107774 02 4 18 XVI Repair Parts continued...
Page 145: ...145 107774 02 4 18 XVI Repair Parts continued...
Page 148: ...148 107774 02 4 18 XVI Repair Parts continued...
Page 150: ...150 107774 02 4 18 XVI Repair Parts continued...
Page 152: ...152 107774 02 4 18 XVI Repair Parts continued 120 121 122 123 124 125 126 127...
Page 159: ...159 107774 02 4 18 SERVICE RECORD DATE SERVICE PERFORMED...
