Domestic Hot Water Connections (Hw And Hacw Only); Table 3 - Control Board Fault Codes - Boreal W-Series Installation And Service Manual

The control board has an on-board LED and a FAULT
pin with a 24VAC output. An external indicator or relay can be
connected across the FAULT pin and ground if external signal-
ing is desired. Should a fault occur, the LED will flash the code
of the fault condition while the safety control in question is open
The codes are shown in TABLE 3.
out the compressor for five minutes when a fault occurs. Three
retries per fault condition are allowed within a 60 minute period.
If the fault condition occurs a fourth time the control board will
permanently lock out the compressor and energize the FAULT
pin. This can only be reset by powering down the unit. The
LED will flash the fault code until the unit is reset.
If the control board enters permanent lockout mode there
is a serious problem with the system and it must be rectified if

TABLE 3 - Control Board Fault Codes

Fault
High Pressure
Low Pressure
Flow
the unit is to maintain good service.
WARNING: REPEATED RESETS OF A LOW PRES-
!
SURE LOCKOUT COULD CAUSE THE HEAT EX-
CHANGER TO FREEZE AND RUPTURE, DESTROY-
ING THE HEAT PUMP AND VOIDING THE WAR-
RANTY.
DOMESTIC HOT WATER
CONNECTIONS (HW & HACW only)
A typical piping diagram for a pre-heat tank configuration
can be found in drawing 000484PDG
Be sure to note the position of the check valve and the direction
of water flow. Other configurations are possible, and there may
be multiple units tied together in larger buildings.
!
WARNING: USE ONLY COPPER LINES TO
CONNECT THE DESUPERHEATER. TEMPERA-
TURES COULD REACH 200F SHOULD THE DHW
CUTOUT SWITCH FAIL, POTENTIALLY RUPTURING
PEX PIPING.
Ensure the tank is filled with water and under pressure
before activating the heat pump. Slightly loosen the boiler drain
on the DHW Out pipe to allow air to escape from the system
before the unit is started. This step will make certain that the
domestic hot water circulator in the unit is flooded with water
when it is started.
!
CAUTION: the domestic hot water pump is water lu-
bricated; damage will occur to the pump if it is run
dry for even a short period of time.
Connect the brown wire with the
to L1 of the compressor contactor (fuse terminal for 575-3-60
units). Ensure the power is off when connecting the wire.
The DHW loop may have to be purged of air several times
before good circulation is obtained. A temperature difference
between the DHW In and DHW Out can be felt by hand when
the circulator pump is operating properly.
Boreal Geothermal Inc.
The control board will lock
Code
1
2
3
at the end of this section.
blue insulated terminal
For the pre-heat tank setup, the final tank should be set to
140°F(60°C), unless local code requires a higher setting. The
pre-heat tank does not require electric elements. This setup
takes full advantage of the desuperheater as it is the sole heat
provider to the pre-heat tank. The desuperheater remains active
during the compressor runtime until the pre-heat tank has been
completely heated by the desuperheater alone. This setup is
more energy efficient than a single tank setup.
CAUTION: If two (2) shut-off valves are located on the
domestic hot water ines as shown in the diagram, a
pressure relief valve must be installed to prevent possible
damage to the domestic hot water circulator pump should
both valves be closed.
Page 8 02 JULY 2009