Unit Controls - UPM
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17
Revised 08/14
8 733 914 818 (2014/08)
SV Heat Pump Series
The UPM Board includes the following features:
•
ANTI-SHORT CYCLE TIMER
:
5 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, thus
avoiding creating large electrical spike.
•
LOW PRESSURE BYPASS TIMER:
If the
compressor is running and the low pressure switch
opens, the controller will keep the compressor ON
for 120 seconds. After 120 seconds 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:
The brownout
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.
•
MALFUNCTION OUTPUT
:
Alarm output is
Normally Open (NO) dry contact.
If pulse is
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".
•
DISPLAY OUTPUT:
The Display output is a pulse
output connected to the Unit Diagnostic Display
(UDD) and it pulses 24VAC when the unit is in an
lockout alarm condition.
UPM Board Factory Default Settings
TEMP
26°F
LOCKOUT
2
RESET
Y
ALARM
PULSE
TEST
NO
UPM DIP SWITCH DEFAULT POSITION
lockout
4
2
reset
R
Y
alarm
Cont
pulse
test
yes
no
Table 3: UPM Fault Blink Codes
LED Blinks
Fault
Fault Criteria
None
None
All fault conditions
nominal
1
High Pressure
Refrigerant discharge
pressure has
exceeded 600 PSIG
2
Low Pressure
Refrigerant suction
pressure has fallen
below 40 PSIG
3
Water Coil
Freeze
Condition
Refrigerant
temperature to the
water coil has fallen
below 30°F for 30
seconds
4
Condensate
Overflow
Condensate levels in
the unit drain pan are
too high
5
Air Coil Freeze
Condition
Refrigerant
temperature to the air
coil has fallen below
30°F for 30 seconds
6
Brown Out
Control voltage has
fallen below 18 VAC
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.
Содержание SV007
Страница 53: ...Notes 53 Revised 08 14 8 733 914 818 2014 08 SV Heat Pump Series NOTES ...
Страница 54: ...54 Notes SV Heat PumpSeries SV Heat Pump Series 8 733 914 818 2014 08 Subject to change without prior notice ...
Страница 55: ...Notes 55 Revised 08 14 8 733 914 818 2014 08 SV Heat Pump Series ...
