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
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21
The DXM2 microprocessor control monitors the refrigerant and
water temperatures to determine when to operate the HWG.
The HWG will operate any time the refrigerant temperature is
suf
fi
ciently above the water temperature. Once the HWG has
satis
fi
ed 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
fl
ash (On 1 second, Off 1 second).
If the control has detected a HWG fault, the DXM2 status LED
will
fl
ash a numeric fault code as follows:
High Water Temperature (>160 ºF)
5
fl
ashes
Hot Water Sensor Fault
6
fl
ashes
Compressor Discharge Sensor Fault
6
fl
ashes
Fault code
fl
ashes 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
fl
ashes 0.3
seconds long, then a 10 second pause, then six
fl
ashes
again, etc.
WARNING!
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.
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 ANTI-SCALD VALVE (PART NUMBER
AVAS4) AT THE HOT WATER STORAGE TANK
WITH SUCH VALVE PROPERLY SET TO CONTROL
WATER TEMPERATURES DISTRIBUTED TO ALL HOT
WATER OUTLETS AT A TEMPERATURE LEVEL THAT
PREVENTS SCALDING OR BURNS!
C
H
M
WATER HEATER
CHECK VALVE
8”
M
AX
HOT WATER
TO HOUSE
ANTI-SCALD
VALVE
ANTI-SCALD
VALVE PIPING
CONNECTIONS
COLD WATER
SUPPLY
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.
Figure 20: Anti-Scald Valve Piping Connections
Hot Water Generator
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 Start-Up” section, below is
completed. Powering the pump before all installation steps
are completed may damage the pump.
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
fl
ushed 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.
