Electric Heater Package Option - Bosch TA025 Installation And Maintenance Manual

10 TA Series
• 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"
6 720 220 046
Considerations
1. Always check incoming line voltage power supply
2. Long length thermostat and control wiring leads
3. Bosch recommends the following guidelines for
4. Do not apply additional controlled devices to the
5. Check with all code authorities on requirements

eleCTrIC HeATer PACKAGe oPTIon

Factory installed internal electric heater packages are
available for all series units. Two power supplies are
required when heater packages are utilized. The power
supply for the heater package (located in the electric
heater package control box) provides power for the
heater elements, the blower motor and the control
circuit for the unit. The power supply for the unit pro-
vides power for the compressor. This allows the electric
heaters to continue to operate along with the blower
motor in the case of unit compressor and/or compres-
sor power supply failure. Each TA Series model has a
number of heater sizes available. Refer to Figure #8 for
heater package compatibility with specific CE Series
units, models nomenclature and electrical data.
Caution
Caution
Subject to change without prior notice
elecric Heater Package option
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.
may create voltage drop. Increase wire gauge or
up-size transformers may be required to insure
minimum secondary voltage supply.
wiring between a thermostat and the unit: 18 GA up
to 60 foot, 16 GA up to 100 ft and 14 GA up to 140 ft.
control circuit power supply without consulting the
factory. Doing so may void equipment warranties.
involving condensate disposal/over flow
protection criteria.
Units supplied with internal electric heat require
two (2) separate power supplies: one for the unit
compressor and one for the electric heater
elements, blower motor and control circuit. Refer to
Figure #8 for wiring instructions, minimum circuit
ampacities and maximum fuse/breaker sizing.
The Electric Heater Kit for Horizontal models
have to be installed before the unit is installed.
Revised 03-11