Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual page 21

Heat Controller, Inc.
Installation
The HWG is controlled by two sensors and a 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
AS FULL LOAD CONDITIONS CAN DRIVE HOT
WATER TANK TEMPERATURES FAR ABOVE SAFE
TEMPERATURE LEVELS IF SENSORS HAVE BEEN
DISCONNECTED OR REMOVED.
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 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. 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 beneficial 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 125°F. This switch
Is shipped from the factory in the "OFF" (125°F) position.
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 (CLIMATEMASTER 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!
HTV/HTD/HTH SERIES
ANTI-SCALD
VALVE PIPING
CONNECTIONS
HOT WATER
TO HOUSE
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 flash (On 1
second, Off 1 second).
If the control has detected a fault, the status LED will flash
a numeric fault code as follows:
Hot Water Sensor Fault
Compressor Discharge sensor fault
High Water Temperature (>160ºF)
Control Logic Error
Fault code flashes 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 flashes
0.4 seconds long, then a 3 second pause, then four flashes
again, etc.
20
CHECK VALVE
ANTI-SCALD
VALVE
C
M
H
WATER HEATER
COLD WATER
SUPPLY
1 flash
2 flashes
3 flashes
4 flashes