Bosch LM024 Operating Instructions Manual page 9
Lm cs series
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Also See for LM024:
- Installation, operation and maintenance manual (34 pages) ,
- Installation manual (12 pages) ,
- Installation, operation and maintenance manual (44 pages)
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LM CS Series Heat
UPM Board Factory Default Settings
TEMP
LOCKOUT
RESET
ALARM
TEST
UPM DIP SWITCH DEFAULT POSITION
lockout
reset
alarm
test
The UPM Board includes the following features:
•
ANTI-SHORT CYCLE TIMER:
break timer to prevent compressor short cycling.
•
RANDOM START:
Each controller has an unique
random start delay ranging from 270 to 300 seconds
on initial power up to reduce the chance of multiple
unit simultaneously starting at the same time after
power up or after a power interruption, thus
avoiding creating large electrical spike.
•
LOW PRESSURE BYPASS TIMER:
compressor is running and the low pressure switch
opens, the controller will keep the compressor ON
for 120 seconds. If, after 120 seconds the low
pressure switch remains open, the controllers will
shut down the compressor and enter a soft lockout.
The compressor will not be energized until the low
pressure switch closes and the anti-short cycle time
delay expires. If the low pressure switch opens 2-4
times in 1 hour, the unit will enter a hard lockout. In
order to exit hard lockout power to the unit would
need to be reset.
•
BROWNOUT/SURGE/POWER
INTERRUPTION PROTECTION:
protection in the UPM board will shut does the
compressor if the incoming power falls below 18
VAC. The compressor will remain OFF until the
voltage is above 18 VAC and ANTI-SHORT CYCLE
TIMER (300 seconds) times out. The unit will not go
into a hard lockout.
Revised 01-14
30°F
2
Y
PULSE
NO
4
2
R
Y
Cont
pulse
yes
no
5 minute delay on
If the
The brownout
•
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 LED 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.
•
TEST DIP SWITCH:
to reduce all time delays settings to 10 seconds
during troubleshooting or verification of unit
operation.
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:
The default setting for the
freeze limit trip is 30°F (sensor number 1); however
this can be changed to 15°F by cutting the R30
resistor located on top of the DIP switch SW1.
default setting for the freeze limit trip is 30°F
(sensor number 1); however this can be
changed to 15°F by cutting the R24 resistor
located on top of the DIP switch SW1. Since
freeze sensor 2 is dedicated to monitor the
evaporator coil it is recommended to leave the
factory default setting on the board. The UPM
controller will constantly monitor the
refrigerant temperature with the sensor
mounted close to the condensing water coil
between the thermal expansion valve and
water coil. If temperature drops below or
remains at the freeze limit trip for 30 seconds,
the controller will shut the compressor down
and enter into a soft lockout condition. Both
the status LED and the Alarm contact will be
active. The LED will flash (three (3) times) the
code associated with this alarm condition. If
this alarm occurs 2 times (or 4 if Dip switch is
Electrical | 9
Alarm output is
If pulse is
A test dip switch is provided
The
8 733 920 847 (2014/01)
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