Water Source Heat Pump Systems Overview

WattMaster WHP Control System
The WattMaster WHP system is used to control the water loop and the individual water source heat pumps installed in a typical water source heat pump system. The WHP system is an excellent alternative over programmable thermostats. The WHP control system provides one central location to monitor and program all the water source heat pumps on the system instead of having to program each water source heat pumps thermostat individually. The system has many features typically not found with programmable thermostats such as: central operators interface, heating/cooling failure alarm, auxiliary alarm, and holiday scheduling, to name but a few.

WHP Controller
The Water Source Heat Pump Controller (WHP) is used for controlling individual water source heat pump units. The WHP Controller can operate stand-alone or it can be used with the Water Source Heat Pump Loop Controller and in this configuration shares common data, such as outside air temperature, proof of flow etc., over a network. A System Manager is connected to the WHP Controller to provide a central operators interface to all WHP Controllers on the network. WHP Controllers are designed with Room Temperature, Room Setpoint Adjust, Discharge Air Temperature, Leaving Water Temp or Dirty Filter Alarm and Auxiliary Lockout inputs. Relay outputs provided are; Fan (Continuous or Cycling), Reversing Valve-ON/OFF, Compressor-ON/OFF, Heat Pump Reset and Aux. Heating or Cooling. An internal seven day schedule and holiday schedule functions are also built into each WHP Controller.

With the WHP system the sometimes complex control requirements of a large water source heat pump system can be handled with an off the shelf controls system that has most of the features of a full blown building automation system but at a much lower cost. Included with the WHP system is a communications interface module, which allows you to connect a computer to the system onsite and a modem connection for remote monitoring.

Prism, a Windows based software package is available at no additional charge. Some of Prism’s features include graphics, trend logging, and remote alarm call out capabilities.

WHP Loop Controller
T
he Water Source Heat pump Loop Controller can be supplied with the system to control the water loop and its various pieces of equipment. The Loop Controller can operate stand-alone or used with the Water Source Heat Pump Controller (WHP) and in this configuration communicates common data, such as outside air temperature, proof of flow etc., over a network. A System Manager is connected to the Loop Controller to provide a central operator’s interface to the Loop Controller’s setpoints and operating configurations. The Loop Controller is designed with inputs for Supply and Return Water Temperature, Outdoor Air Temperature, Loop Water Pressure Switch or 0-50 PSI Loop Pressure Sensor (4-20ma), Manual Reset Contact, Phase Loss Contact, Request to Run Relay, and Fire/Smoke Relay. Analog outputs (0-10VDC) are supplied for Pump VFD and Proportional Heat. Binary outputs are provided for Compressor Enable, Main Pump Relay, Standby Pump Relay, Alarm Contacts and (8) Relays that can be configured for Heat Rejection or Heat Addition.

Make Up Air Controller
A Make Up Air Controller, for treating 100% outdoor air, is available for use with the Water Source Heat Pump system. Please consult the WattMaster factory for more information on this product.

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