Bosch BP070 Installation And Maintenance Manual page 9

Thermostat Connections
energized until the low pressure switch closes and the
anti-short cycle time delay expires. If the low pressure
switch opens 2–4 times in 1 hour, the unit will enter a
hard lock out and need to be reset.
• BroWnouT/SurGe/PoWer InTerruPTIon
ProTeCTIon—The brownout protection in the UPM
board will shut down the compressor if the
incoming power falls below 18 VAC. The compressor
will remain off till the voltage goes above 18 VAC and
the anti short cycle timer (300 seconds) times out.
The unit will not go into a hard lockout.
• MalfunCTIon ouTPuT—The controller has a set of
wet contacts for remote fault indication or dry contacts
for communication with a DDC controller or BMS. The
fault output will depend on the dip switch setting for
"ALARM". If it set to "CONST', a constant signal will be
produced to indicate a fault has occurred and the unit
requires inspection to determine the type of fault. If it is
set to "PULSE", a pulse signal is produced and a fault
code is detected by a remote device indicating the fault.
See L.E.D. Fault Indication below for blink code
explanations. The remote device must have a malfunction
detection capability when the UPM board is set to "PULSE" .
• TeST dIP SWITCH—A test dip switch is provided
to reduce all time delay settings to 5 seconds
during troubleshooting or verification of unit
operation. Note that operation of the unit while in
test mode can lead to accelerated wear and
premature failure of the unit. The "TEST" switch
must be set back to "NO" for normal operation.
• freeze SenSor—This is optional and can be set
to ignore or monitor a freeze sensor. There are 2
configurable freeze points, 35°F & 15°F. The unit
will enter a soft lock out until the temperature
climbs above the set point and the anti-short cycle
time delay has expired. The freeze sensor may not
provide protection in the case of loss of flow in the
heating mode. A flow switch or pressure
differential switch is recommended to prevent unit
operation in case of loss of flow.
If unit is employing a fresh water system (no
anti-freeze protection), it is extremely important to
have the "Freeze" switch set to 35°F in order to
shut down the unit at the appropriate leaving
water temperature and protect your heat pump
from freezing if a freeze sensor is included.
Revised 01-11
Caution
Subject to change without prior notice
• l.e.d. faulT IndICaTIon—Two L.E.D. indicators
are provided:
• Green: Power L.E.D. indicates 18—30 VAC
present at the board.
• Red: Fault indicator with blink codes as follows:
- One blink—High pressure lockout
- Two blinks—Low pressure lockout
- Three blinks—Freeze sensor lockout
- Four blinks—Condensate overflow
- Five blinks—Brownout
• InTellIGenT reSeT—If a fault condition is initiated,
the 5 minute delay on break time period is initiated
and the unit will restart after these delays expire.
During this period the fault LED will indicate the
cause of the fault. If the fault condition still exists or
occurs 2 or 4 times (depending on 2 or 4 setting for
Lockout dip switch) before 60 minutes, the unit will
go into a hard lockout and requires a manual lockout
reset. A single condensate overflow fault will cause
the unit to go into a hard lockout immediately, and
will require a manual lockout reset.
• loCKouT reSeT—A hard lockout can be reset by
turning the unit thermostat off and then back on
when the "RESET" dip switch is set to "Y" or by
shutting off unit power at the circuit breaker
when the "RESET" dip switch is set to "R".
The blower motor will remain active during a
lockout condition.
• uPM Board defaulT SeTTInGS—Your UPM
board will come from the factory with the
following default settings:
• freeze—"ON"
• Temp—35°F
• lockout—2
• reset—"Y"
• alarm—"CONT"
• Test—"NO"
• Hot/dry alarm—"HOT"
6 720 220 045
CP/BP Series 9