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Section 1 WattMaster WHP
1-4 Design Guide
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