10
3.7
Service
Menu
Selecting the SERVICE MENU will display the Login Screen. Enter the service
password, 1234, and press ENTER. The SERVICE MENU allows service related
information to be viewed and modifi ed. Screens that could be available include the Unit
Status, I/O Status, Pressure Cutouts, Sensor Offsets, O/A RH and Temperature
Setpoints and other unit parameters. If PID loops are included for heating or cooling
control, these will be accessible from the SERVICE MENU. The password is bypassed
for 5 minutes after it is fi rst entered. This is displayed on the Login Screen with the text,
“Still Logged In, Press PRG to Enter.” To re-enter the SERVICE MENU without entering
the password, just press the Prg key.
3.8
Unit
Status
Selecting the UNIT STATUS MENU allows unit specifi c data to be viewed. These could
include air/water priority, system mode, occupancy state, event state and compressor
requirements.
3.9
Factory
Confi guration
The Factory Confi guration is preset at the factory before the unit is shipped. Changes
to the confi guration could cause damage to the unit. Modifi cation to these settings
should only be done by a factory trained technician.
3.10
I/O
Status
Selecting the I/O Status Screen displays the four types of I/O devices wired to the unit.
These include the digital inputs, analog inputs, digital outputs and analog outputs. The
Digital Input Screen will display the state of any switch wired to a digital input on the
wiring diagram. The digital inputs are designated as ID on the controller and include
switches or contacts. The Analog Input Screen displays the status of any sensors wired
to the analog inputs on the wiring diagram. The analog inputs are designated as B
in the controller and include devices such as air pressure transducers, refrigerant
transducers, RH sensors and temperature sensors. The Digital Output Screen displays
the state of devices wired to the digital outputs on the wiring diagram. The digital
outputs are designated as NO or NC on the controller and include devices such as
relays, contactors or solenoid coils. The Analog Output Screen displays the value of
devices driven by the output. The analog outputs are designated as Y on the
controller and include devices such as damper actuators and positioning valves.
Please note that the analog outputs from any CM35xx controller are only 0-10 VDC.
A 4–20 mA output is not available.
3.11
Pressure
Cutouts
This screen simply displays the Refrigerant Selection, High Discharge Pressure and
Low Suction Pressure cutout values for the appropriate refrigerant selected. The
operator cannot change these settings. The Cooling Mode Low Pressure Trip is shown
because if the unit is an IAQ heat pump, and the compressor is used for heating, the
Desert Aire - CM35xx Quick Start Guide