Bosch TA Series Installation And Maintenance Manual page 10

10 Ta series
• MalFuNCTIoN ouTPuT—Alarm output is Normally
Open (NO) dry contact. If 24 VAC output is needed
R must be wired to the ALR-COM terminal; 24VAC
will be available on the ALR-OUT terminal when the
unit is in alarm condition. If pulse is selected the
alarm output will be pulsed. 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 10 seconds during
troubleshooting or verifi cation 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—The freeze sensor input is
active all the time, if a freeze option is not selected
the freeze terminals will need a jumper. There are
2 confi gurable freeze points, 30°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 will shut
the compressor output down after 90 seconds of
water fl ow loss and report a freeze condition. It is
recommended to have a fl ow switch to prevent the
unit from running if water fl ow is lost.
If unit is employing a fresh water system (no
anti-freeze protection), it is extremely important to
have the "Freeze" jumper R42 resistor set to 30°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.
• 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:
6 720 220 046
safety devices and the uPM Controller
• 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 overfl ow 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".
Caution
• uPM board deFaulT seTTINGs—Your UPM
board will come from the factory with the
following default settings:
• Freeze—"Terminals not jumped" on all the time
• Temp—30°F
• lockout—2
• reset—"Y"
• alarm—"PULSE"
• Test—"NO"
• dry Contact—"Normally Open (NO)"
Considerations
1. Always check incoming line voltage power supply
Subject to change without prior notice
- One blink—High pressure lockout
- Two blinks—Low pressure lockout
- Three blinks—Freeze sensor lockout
- Four blinks—Condensate overfl ow
- Five blinks—Brownout
The blower motor will remain active during a
lockout condition.
and secondary control voltage for adequacy.
Transformer primaries are dual tapped for 208
and 230 volts. Connect the appropriate tap to
ensure a minimum of 18 volts secondary control
voltage. 24 volts is ideal for best operation.
Revised 05-12