Bosch EP Series Installation And Maintenance Manual page 12

12 | Safety Devices and the UPM Controller
UPM Board Factory Default Settings
TEMP
LOCKOUT
RESET
ALARM
TEST
HOT/DRY ALARM
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. After 2 minutes if 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 down 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 and does not need to be reset.
8733953041 (2019/01)
26°F
2
Y
PULSE
NO
NO
4 2
R Y
Cont pulse
yes no
5 minute delay on
If the
The brownout
Subject to change without prior notice
• 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.
EP Series
Alarm output is
If pulse is
The Display output is a pulse
A test dip switch is provided
he freeze sensor input is
EP Series