Comfort-Aire HEH Series 2 to 5 Tons - Manual (Page 20)

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Installation, Operation & Maintenance HEV/H SERIES Heat Controller, LLC.
HOT WATER GENERATOR
The 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
suffi ciently above the water temperature. Once the HWG has
satisfi 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.
The microprocessor control Includes 3 DIP switches, SW10
(HWG PUMP TEST), SW11 (HWG TEMP), and SW12 (HWG
STATUS).
SW10 HWG PUMP TEST. When this switch is in the “ON”
position, the HWG pump is forced to operate even if there is
no call for the HWG. This mode may be benefi cial to assist in
purging the system of air during Initial start up. When SW10
is in the “OFF” position, the HWG will operate normally. This
switch is shipped from the factory in the “OFF” (normal)
position. NOTE; If left in the “On” position for 5 minutes, the
pump control will revert to normal operation.
SW11 HWG TEMP. The control setpoint of the HWG can
be set to either of two temperatures, 125°F or 150°F. When
SW11 is in the “ON” position the HWG setpoint is 150°F.
When SW11 is in the “OFF” position the HWG setpoint is
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!
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 micro-
processor control. One sensor is located on the compressor
discharge line to sense the discharge refrigerant tempera-
ture. The other sensor is located on the HWG heat exchang-
er’s “Water In” line to sense the potable water temperature.
125°F. This switch Is shipped from the factory in the
“OFF” (125°F) position.
SW12 HWG STATUS. This switch controls operation
of the HWG. When SW12 is in the “ON” position the
HWG is disabled and will not operate. When SW12
is in the “OFF” position the HWG is in the enabled
mode and will operate normally. This switch is shipped
from the factory in the “ON” (disabled) position.
CAUTION: DO NOT PLACE THIS SWITCH IN THE
ENABLED POSITION UNITL THE HWG PIPING IS
CONNECTED, FILLED WITH WATER, AND PURGED
OR PUMP DAMAGE WILL OCCUR.
When the control is powered and the HWG pump
output is not active, the status LED (AN1) will be
“On”. When the HWG pump output is active for water
temperature sampling or HWG operation, the status
LED will slowly fl ash (On 1 second, Off 1 second).
If the control has detected a fault, the status LED will
fl ash a numeric fault code as follows:
Hot Water Sensor Fault 1 fl ash
Compressor Discharge sensor fault 2 fl ashes
High Water Temperature (>160oF) 3 fl ashes
Control Logic Error 4 fl ashes
Fault code fl ashes have a duration of 0.4 seconds with
a 3 second pause between fault codes. For example,
a “Compressor Discharge sensor fault” will be four
fl ashes 0.4 seconds long, then a 3 second pause, then
four fl ashes again, etc.