Heat Controller Water Source Heat Pump manual WattMaster WHP Control System, WHP Controller

Section 1 WattMaster WHP

accommodate changes in location and sizes as thermal zones or zone occupancy change. This system is often installed in ceiling plenums, which frees up valuable floor space.

Another valuable benefit of water source heat pumps is that they can accommodate simultaneous calls from zones requiring heating or cooling. Depending on the climate, outside air may require preheat or cooling prior to being introduced to the unit. In the example of ceiling mounted water source heat pumps, put outside air ducts near each unit to improve indoor air quality.

Normally, multiple units serve an occupied space. This gives component redundancy to the system so if one unit were to fail, the other units could back it up until the unit was repaired. The packaged design of most unit types allows quick change-out by service personnel so maintenance can typically be performed off site.

As with any HVAC system, there is a negative side as the water source heat pump system often requires higher maintenance costs than conventional air side systems. The system also typically has a shorter replacement life than other systems because of continuous fan and compressor operation during heating and cooling modes. The system can also create room noise since the compressor and fan are commonly located close to the zone occupant. Placing units away from the occupied space and ducting the supply air to the zone can minimize potential noise problems.

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

1-4 Design Guide