56
WHL-016 REV. 12.18.14
H. OUTDOOR SENSOR
NOTE:
If the system requires a fixed operating temperature, the outdoor sensor is not required and should not be installed.
There is no connection required if an outdoor sensor is not used in the installation.
1. Use a minimum 22 AWG wire for runs of 100 feet or less and minimum 18 AWG wire for runs of up to 150 feet.
2. Mount the outdoor sensor on an exterior surface of the building, preferably on the north side in an area that will not be affected by
direct sunlight and will be exposed to varying weather conditions.
NOTE:
For correct mounting procedures, follow instructions provided with the sensor.
NOTE:
If sensor wires are located in an area with sources of potential electromagnetic interference (EMI), the sensor wires should be
shielded, or the wires routed in a grounded metal conduit. If using shielded cable, the shielding should be connected to the common
ground of the boiler.
I. INDIRECT SENSOR
There is no connection required if an indirect water heater is not used in the installation.
1. The boiler will operate an indirect fired water heater with either a thermostat type aquastat installed in the indirect tank or an
Westinghouse 7250P-325 tank sensor. When a tank sensor is used, the boiler control will automatically detect its presence and a
demand for heat from the indirect water heater will be generated when the tank temperature falls below the user set point by more than
the user selectable offset. The demand will continue until the sensor measures that the indirect water heater temperature is above the
set point.
2. Connect the indirect sensor (7250P-325) to the terminals marked DHW SENSOR (shown in Figure 29) in the electrical junction box.
Caution should be used to ensure neither of these terminals becomes connected to ground.
NOTE:
If sensor wires are located in an area with sources of potential electromagnetic interference (EMI), the sensor wires should be
shielded, or the wires routed in a grounded metal conduit. If using shielded cable, the shielding should be connected to the common
ground of the boiler.
Failure to use the correct sensor may result in tank temperature being either above or below set point, and could result in decreased
performance, substantial property damage, or heightened risk of injuries due to scalds.
J. OPTIONAL 0-10 VOLT BUILDING CONTROL SIGNAL
1. A signal from a building management system may be connected to the boiler to enable remote control. This signal should be a 0-10
volt positive-going DC signal. When this input is enabled using the installer menu, a building control system can be used to control the
set point temperature of the boiler. The control interprets the 0-10 volt signal as follows; when the signal is between 0 and 1.5 volts, the
boiler will be in standby mode, not firing. When the signal rises above 1.5 volts, the boiler will ignite. As the signal continues to rise
towards its maximum of 10 volts, the boiler will increase in set point temperature. See Part 11 for details on the setting of function 16.
2. Connect a building management system or other auxiliary control signal to the terminals marked 16, 0-10 VOLT + and 17, 0-10
VOLT
– in the electrical junction box (shown in Figure 29). Caution should be used to ensure that the 0-10 VOLT + connection does not
become connected to ground.
3. Move jumper on connection board (shown in Figure 29) from A to B.
4. See Part 10, Section D, Function 17 to program the 0-10 volt signal.
Summary of Contents for WBCNG399W
Page 14: ...14 WHL 016 REV 12 18 14 SPECIFICATIONS AND DIMENSIONS Figure 2 Specifications and Dimensions ...
Page 24: ...24 WHL 016 REV 12 18 14 Figure 8 Piping Symbol Legend ...
Page 59: ...59 WHL 016 REV 12 18 14 Figure 32 Cascade Master and Follower Wiring ...
Page 60: ...60 WHL 016 REV 12 18 14 Figure 33 Internal Connection Diagram LP 293 J ...
Page 83: ...83 WHL 016 REV 12 18 14 055 080 110 PARTS BREAKDOWN Figure 36 Replacement Parts LP 387 J ...
Page 85: ...85 WHL 016 REV 12 18 14 155 199 285 399 PARTS BREAKDOWN ...
Page 86: ...86 WHL 016 REV 12 18 14 Figure 38 Replacement Parts LP 387 KK ...
Page 87: ...87 WHL 016 REV 12 18 14 155 199 285 399 MODEL PARTS BREAKDOWN ...
Page 91: ...91 WHL 016 REV 12 18 14 ...
Page 92: ...92 WHL 016 REV 12 18 14 ...
