Safety Devices and the UPM Controller Overview
12.3 UPM Default Settings and DIP Switch Positions
Fig. 13 UPM Settings DIP Switch (SW1)
OFF
Table 9 UPM DIP Switch Selectable Positions
UPM DIP Switch Selectable Positions
Position Function ON OFF
Factory
Default
1 Lockout 4 2 2
2 Reset R Y Y
3 Alarm Cont Pulse Pulse
4 Test Yes No No
5 Freeze 1 15°F 25°F 25°F
6 Freeze 2 15°F 25°F 25°F
7 Pump ON OFF OFF
NOTICE
DIP switches on both of the UPM boards must be set to match
each other.
NOTICE
When DIP switch position “7” for pump function is set to ON, it
allows the loop pump to run for 30 seconds before starting the
compressor when the UPM has not received a Y call in over 8
hours.
12.4 UPM Board Features
The UPM Board includes the following features:
• ANTI-SHORT CYCLE TIMER: Five-minute delay on
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, in order to avoid creating a large electrical
spike.
• TEST DIP SWITCH: The DIP switch position “4” controls
the Test function. When it is set to “ON,” it will reduce all time
delays settings to 10 seconds during troubleshooting or
verification of unit operation. (Refer to Fig. 13.)(See
Table 9.)
NOTICE
Operation of unit in test mode can lead to accelerated wear
and premature failure of components. The Test switch must
be set back to "OFF" after troubleshooting/servicing.
• LOW-PRESSURE BYPASS TIMER: If the
compressor is running and the low-pressure switch (either
low-pressure switch 1 or 2, corresponding to the First-Stage
or Second-Stage UPM boards) opens, the controller will keep
the compressor ON for 120 seconds. After two 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 two or four times in one hour,
the unit will enter a hard lockout. In order to exit hard lockout
power to the unit would need to be reset. The reset signal is
either a Y or R signal depending on if DIP switch position “2”
is set to ON or OFF. (See Table 9.) If the reset is set to R, the
board must be manually powered OFF and powered back ON
to exit the hard lock out.
28 |
EC Series Heat Pumps — 8733841499 (2024/05)
To Next Page
Loading...
