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Section 2 WattMaster WHP
2-8 Installation and Wiring
Warning: Polarity is very important when connecting power to the controllers!
The grounded side of the control transformer must be connected to
the terminal labeled GND on the controller. If a single transformer is
used to power more than one controller you must connect GND-to-
GND and 24VAC-to-24VAC on each controller. Failure to
observe polarity will result in damage to one or
more components in your system.
The WHP Loop Controller requires the following electrical connections:
-24VAC Supply Voltage.................................................... 2 Conductors (18 Ga. Min.)
-Communications Loop .......2 Conductor twisted pair with shield (18 Ga. Minimum)
(Belden #82760, WattMaster Cable or equivalent)
-Supply Water Temperature Sensor...................................(24 ga. Min.) 2 Conductors
-Return Water Temperature Sensor ....................................(24 ga. Min.) 2 Conductors
-Outside Air Temperature Sensor.......................................(24 ga. Min.) 2 Conductors
-Loop Pressure Sensor (Optional)........................................ (24 ga. Min) 2 Conductors
-Fire/Smoke Alarm Contacts ..............................................(24 ga. Min.) 2 Conductors
-Loop Pressure Switch.........................................................(24 ga. Min) 2 Conductors
-Manual Reset Switch..........................................................(24 ga. Min) 2 Conductors
-Request to Run Contacts ....................................................(24 ga. Min) 2 Conductors
-Analog Outputs...................................................................(24 ga. Min) 2 Conductors
-Binary Outputs....................................................................(24 ga. Min) 2 Conductors
Tip: After making all electrical connections it is advised to unplug all terminal blocks
on the WHP Loop Controller until you are ready to begin the checkout
procedure. This may help to prevent damage if wiring errors occur elsewhere in
the system during installation or start-up.