Cooling Mode; Heating Mode - Bosch EP015 Installation And Maintenance Manual

Ep series
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10 EP 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.
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)"
1. Always check incoming line voltage power
supply 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.
2. Long length thermostat and control wiring leads
may create voltage drop. Increase wire gauge or
up-size transformers may be required to insure
minimum secondary voltage supply.
3. FHP recommends the following guidelines for
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.
4. Do not apply additional controlled devices to
the control circuit power supply without
consulting the factory. Doing so may void
equipment warranties.
5. Check with all code authorities on requirements
involving condensate disposal/over flow
protection criteria.

Cooling Mode

See Typical Wiring Diagram page 24. Energizing the
"O" terminal energizes the unit reversing valve in
the cooling mode. The fan motor starts when the
"G" terminal is energized.
When the thermostat calls for cooling (Y), the loop
pump or solenoid valve if present is energized and
compressor will start.
Once the thermostat is satisfied, the compressor
shuts down accordingly and the fan ramps down to
either fan only mode or off over a span of 30 seconds
(ECM Motors).
Note that a fault condition initiating a lockout will
de-energize the compressor.

Heating Mode

Heating operates in the same manner as cooling,
but with the reversing valve de-energized. The
Subject to change without prior notice
Revised 12-13

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