![background image](http://html1.mh-extra.com/html/carrier/np034-074/np034-074_controls-operation-and-troubleshooting_2561402094.webp)
94
Table 68 — Service Directory (cont)
LEGEND
*An “X
” in the Keypad Entry column indicates that the read-
ing can be forced by entering a value and then pressing
.
The valid force ranges are listed in the Expansion column.
†For unit size 038, enter “034” for SIZE.
For unit size 048, enter “044” for SIZE.
For unit size 078, enter “074” for SIZE.
For unit size 088, enter “084” for SIZE.
For unit size 104, enter “108” for SIZE.
**Unit control system calculated value.
NOTE: If unit is not configured for a certain subfunction, that sub-
function will not show up when scrolling through values.
SERVICE (cont)
Subfunction
Keypad Entry
Display
Description
19
ALERT
LIMITS
(cont)
ORHH X
Outdoor air relative humidity high alert limit X
SPL X
Static pressure low alert limit X
SPH X
Static pressure high alert limit X
BPL X
Building pressure low alert limit X
BPH X
Building pressure high alert limit X
OACL X (034-078)
OCL X (088,104)
Outdoor air cfm low alert limit X
OACH X (034-078)
OCH X (088,104)
Outdoor air cfm high alert limit X
IAQL X
Indoor-air quality low alert limit X
IAQH X
Indoor-air quality high alert limit X
20
SERVICE
HISTORY
SERVHIST
Service history
CAT X
Circuit A run time
CBT X
Circuit B run time
SFT X
Supply-air fan run time
CYC X
Cycles stage 0 to stage 1
21
SERVICE
MAINTENANCE
SRV/MTN
Service maintenance aler
SMAL X
Service/maintenance alert limit (X hrs x 1000)
SMEH X
Service maintenance elapsed hours (X.X x 1000)
22
TIMED
OVERRIDE
HISTORY
OVRDHIST
History of timed overrides
OHR X
Hours of timed overrides
AOSS
— Adaptive Optimal Start/Stop
Cont
— Continuous
CV
— Constant Volume
DTCC
— Discrete Time Clock Control
Exh
— Exhaust
IAQ
— Indoor-Air Quality
MDP
— Minimum Damper Position
NTFC
— Nighttime Free Cooling
OAC
— Outdoor-Air Cfm Control
OAT
— Outdoor-Air Temperature
Rtn
— Return
Temp
— Temperature
VAV
— Variable Air Volume
ENTER
ENTER