Bosch FHP ES Series Installation And Maintenance Manual page 6

6
• Optional Condensate overflow protection sensor
located in the drain pan of the unit and connected to
the 'cond' terminal on the UPM board.
The UPM includes the following features:
• ANTI-SHORT CYCLE TIMER – 5 minute delay on break
timer to prevent compressor short cycling.
• RANDOM START – Each controller has a unique
random start delay ranging from 270 to 300 seconds.
• LOW PRESSURE BYPASS TIMER - The low pressure
switch is bypassed for 120 seconds after compressor
start-up to prevent nuisance low pressure lockouts
during cold start-up in the heating mode.
• BROWNOUT/SURGE/POWER INTERRUPTION PROTECTION
– a 20 millisecond window is monitored for the above
condition. Should any of these conditions be detected,
the 5-minute delay on break timer and the random
start timer delay are initiated.
MALFUNCTION OUTPUT – The controller has a set of
•
wet contacts for remote fault indication.
• TEST SERVICE PIN – A jumper pin is provided to reduce
all time delay settings to 5 seconds during
troubleshooting or verification of unit operation. Note
that operation of the unit in test mode can lead to
accelerated wear and premature failure of the unit.
• 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
• TWO BLINKS
• THREE BLINKS
• FOUR BLINKS
• FIVE BLINKS
6720220330 Revised 05-12
High pressure lockout
Low pressure lockout
Freeze sensor lockout
Condensate overflow
Brownout Conditions
The fault pulse code may be sent to the ALR fault terminal
by placing the Alarm Output pin in the pulse position. The
pulse signal may be sent to a thermostat with a fault
indication LED (24v) and will display the fault code on the
thermostat.
• FREEZE SENSOR – Optional freeze protection sensor,
mounted close to condensing water coil, monitors
refrigerant temperature between condensing water coil
and thermal expansion valve. If temperature drops
below or remains at freeze limit trip for 30 seconds, the
controller will shut down the compressor and enter into
a soft lockout condition. The default freeze limit trip is
30°F, however this can be changed to 15°F by cutting
the R42 resistor located on top of DIP switch SW1.
• INTELLIGENT RESET
the 5 minute delay on break time period and the
random start timer are 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 reoccurs before 60 minutes, the
unit will go into a hard lockout and requires a manual
lockout reset. A condensate overflow fault will cause
the unit to go into a hard lockout immediately.
• LOCKOUT RESET - A hard lockout can be reset by
turning the unit thermostat off and then back on or by
shutting off unit power at the circuit breaker.
NOTE:
The blower motor will remain active during a
lockout condition.
ES SERIES
- If a fault condition is initiated