Service - Carrier 48PG03-16 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Economizer
The economizer accessory usage depends on model size, voltage,
and return duct orientation. When installing this accessory, the
unit must be configured for economizer installation by setting
Configuration→UNIT→EC.EN to YES. The default settings for
the other economizer configurations should be satisfactory. If
they need to be changed, additional information about these
configuration settings can be found in the Economizer section.
Power Exhaust
The power exhaust accessory usage depends on model size,
voltage, and return duct orientation. When installing this
accessory, the unit must be configured for power exhaust
installation by setting Configuration→ECON→PE.EN to
ENBL. The default settings for the other power exhaust
configurations should be satisfactory. If they need to be changed,
additional information about these configurations can be found in
the Power Exhaust section.
Two- -Position Damper
The two-position outdoor air damper accessory usage depends on
model size and return duct orientation. This accessory wires
directly into the low voltage circuit for the indoor fan control. No
other control configuration is needed.
Indoor Air Quality
The indoor air quality (IAQ) sensor (part no. 33ZCSENCO2) is a
field-installed accessory which measures CO
When installing this sensor, the unit must be configured for IAQ
use by setting Configuration→AIR.Q→IA.CF to a value of 1, 2,
or 3. See the Indoor Air Quality section for more information.
Outdoor Air Quality
The outdoor air quality (OAQ) sensor (part no. 33ZCSENCO2)
is a field-installed accessory that measures CO
When installing this sensor, the unit must be configured for OAQ
use by setting Configuration→AIR.Q→OA.CF to a value of 1
or 2. See the Indoor Air Quality section for more information.
Smoke Detectors
The smoke detectors are field-installed accessories. These
detectors can detect smoke in either the return air (part no.
CRSMKDET003A00) or supply and return air (part no.
CRSMKSUP002A00). When installing either detector, the unit
must be configured for
Configuration→UNIT→FS.SW to normally open (1) or
normally closed (2).
NOTE: When a Humidi-Mizer™ system is installed, the inputs
to the fine shutdown are moved to the control harness. See the
Third Party Control section for more information.
Filter Status
The filter status accessory (part no. CRSTATUS002B00) is a
field-installed accessory. This accessory detects plugged filters.
When installing this accessory, the unit must be configured for
filter status by setting Configuration →UNIT→FL.SW to
normally open (1) or normally closed (2). Normally open (1) is
the preferred configuration.
Fan Status
The fan status accessory (part no. CRSTATUS003B00) is a
field-installed accessory. This accessory detects when the indoor
fan is blowing air. When installing this accessory, the unit must
be configured for
Configuration→UNIT→FN.SW to normally open (1) or
normally closed (2). Normally open (1) is the preferred
configuration.
levels in the air.
2
levels in the air.
2
fire shutdown by setting
fan status by setting
Enthalpy Sensors
The enthalpy accessories (part no. CRENTSNG002A00 and
CRENTDIF002A00) are field-installed accessories. The first
accessory (outdoor air only) determines when the enthalpy is low
relative to a fixed reference. Adding the second accessory (return
air) compares the enthalpy between the outdoor and return
airstreams. In each case, the enthalpy 4 to 20 mA signals are
converted to a switch output which is read by the ECB. When
installing this accessory, the unit must be configured for
enthalpy-based control
Configuration→ECON→EN.SW to normally open (1). See Fig.
22 and 23 for wiring details.
Return Supply Air Temperature Sensor
The temperature sensor (part no. 33ZCSENSAT) is a
field-installed accessory which may be installed on the common
return air duct and/or the common supply air duct near the unit.
The duct return air temperature (RAT) may be selected for display
only if the space temperature offset (SPTO) is not used. When
installing the sensor, the unit must be configured by setting
Configuration→UNIT→RAT.S to YES. The duct supply air
temperature (SAT) may be used to replace the SAT sensor that is
internal to the unit. A supply duct SAT measurement is valid for
heating mode display while the factory-standard internal SAT is
not valid for heating due to its location upstream of the heating
section. When installing the supply duct SAT, the unit must be
configured by setting Configuration→UNIT→SAT.H to ENBL.
A SAT sensor in the supply duct is the preferred configuration for
systems with Carrier variable volume and temperature (VVT®)
accessory controls.
Space Humidity Sensor
The space relative humidity sensor (part no. HL39ZZ005 duct
mount or HL39ZZ007 wall mount) is a field-installed accessory.
The space relative humidity (RHS) may be selected for display
only if the outdoor air quality sensor (OAQ) is not used and an
economizer board is installed. When installing the relative
humidity sensor, the unit must be configured by setting
Configuration →UNIT→RH.S to YES.
Electric Heat
The electric heat accessory depends on model size, voltage, and
heater kW size. When field installing this accessory, the unit must
be configured for
Configuration→HEAT→HT.TY to a value of 2. The number of
electric heat stages must
Configuration→HEAT→N.HTR per the installed heater.
NOTE: Heaters have either 1 or 2 stages. Refer to electric heater
accessory installation instructions for more information.

SERVICE

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit
rating plate.
111
by setting
electric heat by setting
be configured by setting