Bosch FHP EC Large Series Installation, Operation And Maintenance Manual page 12

12 | Safety Devices and the UPM Controller
• MALFUNCTION OUTPUT:
Normally Open (NO) dry contact.
selected the alarm output will be pulsed. The
fault output will depend on the dip switch
setting for "ALARM". If it is 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 explanation. The remote
device must have a malfunction detection
capability when the UPM board is set to
"PULSE".
If 24 VAC output is needed R must be wired to
ALR-COM terminal; 24 VAC will be available o
the ALR-OUT terminal when the unit is in the
alarm condition.
• DISPLAY OUTPUT:
output connected to the Unit Diagnostic Display
(UDD) and it pulses 24VAC when the unit is in an
lockout alarm condition.
• TEST DIP SWITCH:
to reduce all time delays settings to 10 seconds
during troubleshooting or verification of unit
operation.
NOTE: Operation of unit in test mode can
lead to accelerated wear and premature
failure of components. The "TEST" switch
must be set back to "NO" after
troubleshooting/servicing.
• FREEZE SENSOR:
T
active all the time, if a freeze option it not
selected the freeze terminals will need a
jumper. There are two (2) configurable freeze
points, 26°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 flow loss and report a freeze
condition.
It is recommended to have a flow switch to
prevent the unit from running if water flow is lost.
T111970289 (2015/01)
Alarm output is
If pulse is
The Display output is a pulse
A test dip switch is provided
he freeze sensor input is
Subject to change without prior notice
NOTE: If unit is employing a fresh water
system (no anti-freeze protection), it is
extremely important to have the Freeze1
R42 resistor set to 26°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 on board.
Red: Fault indicator with the following blink
codes;
1 - High Pressure Lockout
2 - Low Pressure Lockout
3 - Freeze Sensor Lockout
4 - Condensate Overflow
5 - 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.
NOTE: Always check incoming line
voltage power supply and secondary
control voltage for adequacy
EC Series
EC Series