Carrier 69NT40-561-399 Operation And Service Manual page 69

CODE # TITLE
Cd53 Automatic Set point Change
Mode Parameter Selection
Display Only Functions - Cd54 through Cd58 are display only functions.
Cd54 Suction Port Superheat /
Electronic Expansion Valve
Status
Cd55 Discharge Superheat
Table 4–3 Controller Function Codes (Continued)
DESCRIPTION
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
"10.0C"
"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
"10.0C
Initially Cd53 will display current count down timer increments of (1
day)_(1hr), default "0_0
Pressing ENTER key will take the interface down into a hierarchy of
parameter selection menus, (mode, act, treat, days, probe and spnew
setting). Pressing ENTER key in any of the parameter selection
menus selects the currently displayed parameter and causes 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.
Pressing CODE SELECT key in a selection menu cancels the current
selection activity and ascends 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 configu-
ration 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 sec-
ond 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 pretrip test or Trip Start is initiated, ASC mode
goes to OFF.
Reading for evaporator superheat (suction temperature minus suction
saturation temperature as calculated from suction pressure) is shown
on the right display.
Press ENTER at Cd54 to show reading for EEV position (in %) on left
display.
Cd55 will display discharge superheat (discharge temperature minus
discharge saturation temperature as calculated from discharge pres-
sure) values in C /F as calculated by the discharge temperature
minus the discharge saturation temperature as calculated from dis-
charge pressure. "-----" will be displayed if selection is not valid.
4–35 T-365