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Model ERCH-HP Energy Recovery Unit
Unit Protection Module (UPM)
Fault Indications
Each unit includes one Unit Protection Module (UPM)
printed circuit board and each UPM has two LED
indictor lights.
LED
Color
LED Fault Indication
Green
Power LED indicates 18-30 VAC present at
the board
Red
Dual or
Single
Compressor
# of
blinks
Status
Dual
Compressor
1
High pressure lockout
Compressor 1
2
Low pressure lockout
Compressor 1
3
High pressure lockout
Compressor 2
4
Low pressure lockout
Compressor 2
5
Freeze sensor lockout
(optional item)
6
Condensate overflow
in coil drain pan
(optional item)
7
Brownout AC voltage
to R and C terminal
below 18 VAC
Single
Compressor
1 High pressure lockout
2 Low pressure lockout
3
Freeze sensor lockout
(optional item)
4
Condensate overflow
in coil drain pan
(optional item)
5
Brownout AC voltage
to R and C terminals
below 18 VAC
Intelligent Reset
If a fault condition is initiated, the five minute delay
on break time period and the random start timer 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 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”.
Your UPM board will come
from the factory with the
following default settings:
Default Settings
Freeze NO
Temp 35°
Lockout 2
Reset T
Alarm CONT
Test NO
Hot/Dry Alarm HOT