T h e Q u a l i t y L e a d e r i n C o n d i t i o n i n g A i r
Installation
The HWG is controlled by two sensors and the DXM2 microprocessor control. One sensor is located on the compressor discharge line to sense the discharge refrigerant temperature. The other sensor is located on the HWG heat exchanger’s “Water In” line to sense the potable water temperature.
WARNING!
WARNING! UNDER NO CIRCUMSTANCES SHOULD THE SENSORS BE DISCONNECTED OR REMOVED. FULL LOAD CONDITIONS CAN DRIVE HOT WATER TANK TEMPERATURES FAR ABOVE SAFE TEMPERATURE LEVELS IF SENSORS DISCONNECTED OR REMOVED.
R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A
R e v. : 0 3 A u g u s t , 2 0 1 2
Hot Water Generator
Figure 20:
ANTI-SCALD
COLD WATER
VALVE PIPING | SUPPLY | |
CONNECTIONS | ||
CHECK VALVE | ||
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VALVE |
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HOT WATER | C | |
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M |
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TO HOUSE | H | |
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| 8” MAX |
The DXM2 microprocessor control monitors the refrigerant and
water temperatures to determine when to operate the HWG.WATER HEATER The HWG will operate any time the refrigerant temperature is
sufficiently above the water temperature. Once the HWG has satisfied the water heating demand during a heat pump run cycle, the controller will cycle the pump at regular Intervals to determine if an additional HWG cycle can be utilized.
When the control is powered and the HWG pump output is active for water temperature sampling or HWG operation, the DXM2 status LED will slowly flash (On 1 second, Off 1 second).
If the control has detected a HWG fault, the DXM2 status LED will flash a numeric fault code as follows:
High Water Temperature (>160 ºF) | 5 flashes |
Hot Water Sensor Fault | 6 flashes |
Compressor Discharge Sensor Fault | 6 flashes |
Fault code flashes have a duration of 0.3 seconds with a 10 second pause between fault codes. For example, a “Compressor Discharge sensor fault” will be six flashes 0.3 seconds long, then a 10 second pause, then six flashes again, etc.
WARNING!
WARNING! USING A 150°F SETPOINT ON THE HWG WILL RESULT IN WATER TEMPERATURES SUFFICIENT TO CAUSE SEVERE PHYSICAL INJURY IN THE FORM OF SCALDING OR BURNS, EVEN WHEN THE HOT WATER TANK TEMPERATURE SETTING IS VISIBLY SET BELOW 150°F. THE 150°F HWG SETPOINT MUST ONLY BE USED ON SYSTEMS THAT EMPLOY AN APPROVED
WITH SUCH VALVE PROPERLY SET TO CONTROL WATER TEMPERATURES DISTRIBUTED TO ALL HOT WATER OUTLETS AT A TEMPERATURE LEVEL THAT PREVENTS SCALDING OR BURNS!
WARNING!
WARNING! The HWG pump Is fully wired from the factory. Use extreme caution when working around the microprocessor control as it contains line voltage connections that presents a shock hazard that can cause severe injury or death!
The heat pump, water piping, pump, and hot water tank should be located where the ambient temperature does not fall below 50°F [10°C]. Keep water piping lengths at a minimum. DO NOT use a one way length greater than 50 ft. (one way) [15 m]. See Table 6 for recommended piping sizes and maximum lengths.
All installations must be in accordance with local codes. The installer is responsible for knowing the local requirements, and for performing the installation accordingly. DO NOT activate the HWG until “Initial
Water Tank Preparation
1.Turn off power or fuel supply to the hot water tank.
2.Connect a hose to the drain valve on the water tank.
3.Shut off the cold water supply to the water tank.
4.Open the drain valve and open the pressure relief valve or a hot water faucet to drain tank.
5.When using an existing tank, it should be flushed with cold water after it is drained until the water leaving the drain hose is clear and free of sediment.
6.Close all valves and remove the drain hose.
7.Install HWG water piping.
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