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WHP - Water Source Heat Pump
Design, Installation &
Operations Manual
Revision 02A
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WattMaster WHP Installation & Operations Manual Section 1.................................................................................... Design Guide Section 2...................................................................Installation and Wiring Section 3....................................................................................Programming Section 4....................................................... Start-Up and Troubleshooting This document is subject to change without not
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Section 1 Table of Contents Conventions .....................................................................1 General Information.........................................................2 Water Source Heat Pump Units .......................................................................................2 Water Source Heat Pump Systems ..................................................................................3 WattMaster WHP Control System.................................................
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WattMaster WHP Section 1 Conventions This document uses the following definitions throughout as a guide to the user in determining the nature of the information presented: Note: Additional information which may be helpful. Tip: Suggestion to make installation, set-up, and troubleshooting easier. Caution: Items which may cause the equipment not to function correctly but will not otherwise damage components. Warning: Errors which can result in damage to equipment and void warranties. Design Guide
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Section 1 WattMaster WHP General Information Water Source Heat Pump Units A water source heat pump is a self-contained water-cooled packaged heating and cooling unit with a reversible refrigerant cycle. Its components are typically enclosed in a common casing, and include a tube-in-tube heat exchanger, a heating/cooling coil, a compressor, a fan, a reversing valve and controls. 1-2 Design Guide
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WattMaster WHP Section 1 Figure 1-1: Typical Water Source Heat Pump During the cooling mode, the tube-in-tube heat exchanger functions as a condenser and the coil as an evaporator. In heating mode, the tube-in-tube heat exchanger functions as an evaporator and the coil as a condenser. A reversing valve is installed in the refrigerant circuit permitting changeover from heating to cooling, and vice versa. The condenser and evaporator tubes are designed to accept hot and cold refrigerant liquid
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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
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WattMaster WHP Section 1 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 all
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Section 1 WattMaster WHP WHP Sequence of Operation HVAC Mode of Operation There are four possible modes of operation. These are Cooling Mode, Heating Mode, Vent Mode, and the Off Mode. The HVAC mode of operation is calculated the same way in both occupied and unoccupied modes of operation. Off Mode The schedule is off and no overrides are active. There is no heating or cooling demand in the space. Under these conditions, all outputs will be off and the analog output will be set to 0.0 vdc. Vent
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WattMaster WHP Section 1 Occupied/Unoccupied Mode of Operation Since the WHP contains its own built in Real Time Clock, it can operate from its own internal scheduling system. This schedule supports two Start & Stop events per day and up to 14 Holiday periods. The Holidays all use the same special Holiday Start/Stop times programmed by the user. If the current operating mode is unoccupied, the WHP can accept a push-button override back to the occupied mode. Push-button overrides are not recogniz
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Section 1 WattMaster WHP HVAC Operation w/ Reversing Relay If the user has configured the WHP to control a Reversing Valve and a Compressor, the following sequence of operation occurs during a heating or cooling demand. Note: If you configure the WHP to look for a proof of flow Enable signal from the Loop Controller then the following sequence assumes a request was made by the WHP during a demand condition and that the Loop Controller gave permission for the WHP to start its compressor. Otherwi
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WattMaster WHP Section 1 HVAC Operation w/ Heat/Cool Relays If the user has configured the WHP to control Individual Heating and Cooling relays the following sequence of operation occurs during a heating or cooling demand. NOTE: If you configure the WHP to look for a proof of flow Enable signal from the Loop Controller then the following sequence assumes a request was made by the WHP during a demand condition and that the Loop Controller gave permission for the WHP to operate its heating or cool
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Section 1 WattMaster WHP WHP Loop Controller Sequence of Operations Summary The Water Source Heat Pump Loop Controller waits for a Request to Run signal from a Heat Pump or from a Binary Contact Closure. Once the request is received the Loop Controller activates a Pump to initiate water flow to the Heat Pumps. Once the pump is activated and proof of flow has been determined, a Global is broadcast to all Heat Pumps to enable them to go ahead and run their compressors. The main goal of the Loop Co
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WattMaster WHP Section 1 pump exceeds the first pumps run time by the same amount. This keeps both pumps with roughly the same number of hours on each pump. Changeover occurs at the time the run time setpoint is exceeded. The running pump is shut off at the same time the standby pump is energized, this prevents any down time or alarms. The unit can be configured to control either the Loop Inlet temperature or the loop outlet temperature. A user adjustable low outdoor air temperature setting of
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Section 1 WattMaster WHP Heat Rejection Control If the compressor is not running, no heat rejection can be active. If any heat rejection is still active when the compressor is turned off, the heat rejection will be immediately removed, without regard to any minimum run or off times. Heat rejection cannot be active at the same time as heat addition, so any heat addition is removed or staged off before the heat rejection can be started. A maximum of 8 stages of heat rejection can be controlled. St
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WattMaster WHP Section 1 Staged Heat Addition Heat Addition is staged up based on a different deadband level for each stage. Basically, if the user programmed a 2° deadband, then the first stage could activate at the setpoint, stage 2 would activate 2° below the setpoint, stage 3 would activate 4° below the setpoint, etc... Staging down is calculated in the same manner, except the water temperature would need to increase above the setpoint by the deadband amount. If stage 3 was activated at 4° b
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Section 1 WattMaster WHP Water Temperature Alarming The controlling water temperature is monitored to prevent it from exceeding both a user defined High and Low Alarm Limit. If either limit is exceeded for a user defined length of time, an alarm is generated and the compressor output is de-activated. If the high limit is exceeded, the heat addition outputs are de-activated and if the low limit is exceeded, the heat rejection outputs are de-activated. The alarming and shutdown only pertains to th
