4–3 T-362
4.2 Controller Software
The controller software is a custom designed program that is subdivided into configuration software and
operational software. The controller software performs the following functions:
• Control supply or return air temperature to required limits, provide modulated refrigeration operation,
economized operation, unloaded operation, electric heat control, and defrost. Defrost is performed to clear
buildup of frost and ice to ensure proper air flow across the evaporator coil.
• Provide default independent readouts of setpoint and supply or return air temperatures.
• Provide ability to read and (if applicable) modify the configuration software variables, operating software
function codes and alarm code indications.
• Provide a pre-trip step-by-step checkout of refrigeration unit performance including: proper component
operation, electronic and refrigeration control operation, heater operation, probe calibration, pressure limiting
and current limiting settings.
• Provide battery-powered ability to access or change selected codes and setpoint without AC power connected.
• Provide the ability to reprogram the software through the use of a memory card.
4.2.1 Configuration Software (CnF Variables)
Configuration software is a variable listing of the components available for use by the operational software. This
software is factory installed in accordance with the equipment fitted and options listed on the original purchase
order. Changes to the configuration software are required only when a new controller has been installed or a
physical change has been made to the unit such as the addition or removal of an option. A configuration variable
list is described in Table 4–3. Change to the factory-installed configuration software is achieved via a configuration
card or by communications.
Table 4–3 Controller Configuration Variables
Config Title Default Option
CnF04 Enable Dehumidification On OFF
CnF08 Evaporator Motor Type 1Ph 3Ph
CnF11 Defrost “Off” Selection noOFF OFF
CnF18 Heater Type Old (Low Watt) nEW (High Watt)
CnF22 Economy Mode OFF Std, Full, CUSt
CnF23 Enable Defrost Interval Save noSAv SAv
CnF24 Enable Long Pre-Trip Test Series Auto (Auto1) Auto2, Auto3
CnF25 Enable Pre-Trip Data Recording rSLtS dAtA
CnF26 Heat Lockout Temperature Set to -10C Set to -5C
CnF28 Enable Bulb Mode NOr bULb
CnF31 Probe Check SPEC Std
CnF33 Enable Snap Freeze OFF SnAP
CnF34 Temperature Unit Display bOth F, C
CnF37 Electronic Chart Probe rEtUR SUPPL, bOth
CnF39 Enable Expanded Current Limits Out In
CnF41 Enable Low DTT Setting Out In
CnF42 Enable Auto Pre-Trip Trip Start Out In
CnF44 Autoslide Enable Out LO, UP
CnF45 Low Humidity Enabled Out In
CnF46 Quench / Liquid Injection Valve Type nO nC
CnF47 Vent Position OFF UP, LOW, CUStOM
CnF49 OEM Reset Option OFF Std, SPEC, CUSt
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