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T-372 4–34
Cd53 Automatic Setpoint
Change (ASC) Mode
Parameter Selection
Automatic Setpoint Change (ASC) Mode:
Cd53 increments of (1 day)_(1hr), Display: default “0_0 “
“done” mm-dd this will be display is ASC has completed
“ASC” value “On” “OFF” Display /Select: default “OFF“
“nSC” value “1 - 6” (This is the value “n” for the subsequent entries).
“SP (n-1)” value °C / °F on 0.1 degree increments Display/Select: default
“10.0°C“
“DAY (n-1)” value “1 – 99” increments of 1 Display/Select: default “1“
“SP (n)” value °C / °F on 0.1 degree increments Display/Select: default “10.0°C
Initially Cd53 will display current count down timer increments of (1 day)_(1hr),
default “0_0
Press the ENTER key to take the interface down into a hierarchy of parameter
selection menus, (mode, act, treat, days, probe and spnew setting). Press the
ENTER key in any of the parameter selection menus to select the currently
displayed parameter and cause the interface to descend into the next parameter
selection menu. All parameter selection menus alternate between a blank display
and the current selection in the right hand display.
Press the CODE SELECT key in a selection menu to cancel the current selection
activity and ascend back up to the next higher selection menu (or to Cd53 display
mode if that is the next higher).
If the operator does not press any key for five seconds the interface reverts to
normal system display and the current selection menu is cancelled, but any
previously committed changes are retained.
Available parameters and parameter ranges are a function of configuration
options and previously selected parameters as indicated above.
Parameter with the exception of “ASC” may not be altered if Cd53 is re-entered
if “ASC” is “On”. When ASC has completed including reaching the last setpoint
“done” on the left display and the MONTH DAY of completion on the right display
will be displayed as the second entry in the menu. Turning ASC off clears this
entry. This action also resets Cd53 to initial time remaining. ASC must then be
turned on to view or modify the additional parameters.
Whenever any auto pre-trip test or Trip Start is initiated, ASC mode goes to OFF.
Display Only Functions - Cd54 through Cd58 are display only functions.
Cd54 Suction Port Superheat
/ Electronic Expansion
Valve Status
Reading for evaporator superheat (suction temperature minus suction saturation
temperature as calculated from suction pressure) is shown on the right display.
Press the ENTER key at Cd54 to show reading for EEV position (in %) on left
display.
Cd55 Discharge Superheat Cd55 will display discharge superheat (discharge temperature minus discharge
saturation temperature as calculated from discharge pressure) values in C /F as
calculated by the discharge temperature minus the discharge saturation
temperature as calculated from discharge pressure.
“-----” will be displayed if selection is not valid.
Table 4–8 Controller Function Codes (Continued)
Code Title Description