Unit Protection Module; Economizer; Reference; Technical Assistance Information - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Troubleshooting - Unit Protection
Module (Heat Pump Only)
Each unit includes one Unit
Protection Module (UPM)
printed circuit board with two
LED indictor lights. The UPM
board will come from the
factory with default settings.
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".
LED
LED Fault Indication
Color
Green Power LED indicates 18-30 VAC present at the board
Dual or Single # of
Compressor blinks
1
2
3
Dual
4
Compressor
5
Red
6
7
1
2
3
Single
Compressor
4
5
54 General Description - NOT model specific Energy Recovery Ventilator with Heating and Cooling
Default Settings
Freeze NO
Temp 35°F
Lockout 2
Reset T
Alarm CONT
Test NO
Hot/Dry Alarm HOT
Status
High pressure lockout
Compressor 1
Low pressure lockout
Compressor 1
High pressure lockout
Compressor 2
Low pressure lockout
Compressor 2
Freeze sensor lockout
(optional item)
Condensate overflow in coil
drain pan (optional item)
Brownout AC voltage to R
and C terminal below 18 VAC
High pressure lockout
Low pressure lockout
Freeze sensor lockout
(optional item)
Condensate overflow in coil
drain pan (optional item)
Brownout AC voltage to R
and C terminals below
18 VAC
Troubleshooting - Economizer
Alarms
Addressing Alarms
Alarms will signify a faulty sensor. When this occurs,
verify all connections to the sensor and controller are
secure. Press enter twice to clear the alarm. If the issue
persists, consult the factory.
Clearing Alarms
Once the alarm has been identified and the cause has
been removed (e.g. replaced faulty sensor), the alarm
can be cleared from the display.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the (enter).
3. ERASE? displays.
4. Press (enter).
5. ALARM ERASED displays.
6. Press (escape) to complete the action and return
to the previous menu.
If an alarm still exists after you clear it, it redisplays
within 5 seconds.

Reference

Technical Support
For technical support contact the Tempered Air
Products group from Monday - Friday, 8AM-5PM CST
at 1-877-202-6123.
Refer to the following Installation, Operation and
Maintenance Manuals for additional details. All are
available at www.greenheck.com
• DDC Controller for Energy Recovery
• ERCH Curbs
• PVF/PVG Indirect Gas-Fired Heat Modules
NOTE
®