Carrier 38VMA Series, Service Manual, Page: 40 / 112

Table 32 -
List of Advanced Mode Codes
Symbol Function Item Description
_n1_ Special function for debug
_n12
Forced cooling (62.6
⁰
F of IDU)
_n13 Forced heating (86
⁰
F of IDU)
_n14 Cooling test
_n15 Heating test
_n2_ Refrigerant recycle function
_n21 Refrigerant recycle to outdoor units
_n22 Refrigerant recycle to indoor units
_n23 Refrigerant recycle to piping
_n26 Maintenance operation
_n3_ Error query
_n31 Historical error query
_n32 Clear the historical errors
_n4_ Night time setting
_n41 6/10h (default)
_n42 6/12h
_n43 8/10h
_n44 8/12h
_n5_ Silent mode setting
_n51 Night silent mode
_n52 Silent mode
_n53 Super silent mode
_n54 None silent mode (default)
_n8_ Static pressure mode setting
_n81 Standard static pressure mode (Default)
_n82 Low static pressure mode (Reserved)
_n83 Medium static pressure mode (Reserved)
_n84 High static pressure mode (Reserved)
_nb_ Temperature unit setting
_nb1 Temperature unit: °C
_nb2 Temperature unit: °F (Default)
_NC_
T4 sensor (outdoor temperature) threshold
to enable Auxiliary Heat. Aux heat will
enable when outdoor temperature falls 1.8 F
below this temperature.
_nC1 Auxiliary heat disabled
_nC2 5°F
_nC3 15°F
_nC4 25°F
_nC5 35°F
_nC6 45°F
_nC7 55°F
_nC8 65°F
NOTE:
All codes are only available for master unit.
a. Instruction for Advanced Mode
Special function for debug:
“
_n12” Forced Cooling
Enter “Forced cooling (_n12)” mode. All indoor units will run in cooling mode, and the forced cooling mode will be exited
automatically after running 60 minutes.
“
_n13” Forced Heating
Enter “Force heating (_n13)”mode. All indoor units will run in heating mode, and the forced heating mode will be exited
automatically after running 60 minutes.
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