Field-Installed; Spa; Economizer - Carrier 50PG20-28 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Field-Installed Accessories
SPACE TEMPERATURE SENSOR (T-55) The T-55 space
temperature sensor (part no. 33ZCT55SPT) is a field-installed
accessory. The sensor is installed on a building interior walt to
measure room air temperature. The T-55 sensor also includes an
override button on the fiont cover to permit occupants to over-
ride the Unoccupied Schedule (if progralrnned). The jumper
wire in the instalter's packet must be connected between R and
W1 when using a T-55 device. See Fig. 30 and 31.
SPACE TEMPERATURE SENSOR (1-56) The T-56 space
temperature sensor (part no. 33ZCT56SPT) is a field-installed
accessory. This sensor includes a sliding scale on the fiont
cover that permits an occupant to adjust the space temperature
set point remotely. The T-56 sensor also includes an override
button on the front cover to allow occupants to override the
unoccupied schedule (if progalrnned). The jumper wire in the
installer's packet must be connected between R and Wl when
using a T-56 device. See Fig. 30 and 32.
SPACE TEMPERATURE SENSOR (T-58) The T-58
space temperature sensor (part no. 33ZCT58SPT) is a field-in-
stalled accessory. The T-58 sensor colrnnunicates with the
ComJbrtLink
TM
controtlei; providing space temperature, heat-
ing and cooling set points, and mode operation inlbnnation.
The jumper wire in the installer's packet must be connected
between R and W1 when using a T-58 device. See Fig. 33.
REIN"to the T-58 installation instructions for information on
installing and configuring the T-58 sensor.
Each T-58 sensor must have a unique address on the CCN.
Each T-58 sensor must also be confi_red with the address of
the unit control it is communicating to.
SPACE TEMPERATURE SENSOR AVERAGING See
Fig. 34 for space temperature averaging with T-55 sensors only.
If the use of one T-56 sensor is required, refer to Fig. 35.
ECONOMIZER The economizer accessory usage de-
pends on model size. When installing this accessory, the unit
must be configured for economizer installation by setting
(bnfgmvttion--->ECON--->ECEN to YES. The dethult settings
for the other economizer confi_rations should be satislhctory.
If they need to be changed, additional information about these
configuration settings can be tbund in the Economizer section.
POWER EXHAUST The power exhaust accessory usage
depends on voltage. When installing this accessory, the unit
must be configured for power exhaust installation by setting
(bnfigutvttion-->ECON-->PE.EN to ENBL. The default set-
tings for the other power exhaust configurations should be
satisihctory. If they need to be changed, additional inibnnation
about these configurations can be found in the Power Exhaust
section.
TWO-POSITION DAMPER This accessory wires direct-
ly into the low voltage circuit tbr the indoor fan control. No
other control configuration is needed.
INDOOR AIR QUALITY The indoor air quality ([AQ)
sensor is a field-installed accessory which measures CO2 levels in
the air. When installing this sensor, the unit must be configured tbr
IAQ use by setting Configuralion--_AIR.O--dA.CF to a value
of 1, 2, or 3. See the Indoor Air Quality section lbr more
information.
OUTDOOR AIR QUALITY The outdoor air quality
(OAQ) sensor (part no. 33ZCSENCO2) is a field-installed acces-
sory that measures CO2 levels in the air. When installing this
sensor, the unit must be configured lbr OAQ use by setting
Configuration--->AIR.O_OA.CF to a value of 1 or 2. See the
Indoor Air Quality section lbr more inlbnnation.
SMOKE DETECTORS The Slnoke detectors are field-
installed accessories. These detectors can detect smoke in
either the return air (part no. CRSMKDET001D00) or supply
and return air
(part
no. CRSMKSUP001B00). When installing
either detectoi; the unit must be configured for tire shutdo,am by
setting Configuration-->UNIr-->FS.SW to normally open (1)
or nonnalty closed (2).
NOTE: When a Humidi-Mizer
TM
system is installed, the
inputs to the fire shutdown are moved to the control harness.
See the Third Party Control section on page 38 for more
information.
FILTER STATUS The filter status accessory (part no.
CRSTATUS003B00) is a field-installed accessory. This accesso-
ry detects plugged filters. When installing this accessory, the unit
must be configuzed for filter status by setting (bnfiguration
---_UNIT---_FL.SWto normally open (1) or normally closed (2).
Normally open (1) is the preferred configuration.
FAN STATUS The thn status accessory (part no.
CRSTATUS003B00) is a field-installed accessory. This acces-
sory detects when the indoor flax1 i s blowing air. When installing
this accessory, the unit must be configured tbr fan status by
setting Configuration--+UNIT---_FPc:SW to m_nally open (1)
or nonnalty closed (2). Nonnatly open (1) is the preferred
configuration.
ENTHALPY SENSORS The enthalpy accessories (part
no. CRENTSNG02A00 and CRENTDIF02A00) are field-
installed accessories. The first accessory (outdoor air only)
determines when the enthatpy is low relative to a fixed refer-
ence. Adding the second accessory (return air) compares the
enthalpy between the outdoor and return airstreams. In each
case, the enthalpy 4 to 20 mA simmls are converted to a switch
output which is read by the ECB. When installing this accesso-
ry, the unit must be configured for enthalpy-based control by
setting (bnfiguration -->E(DN--_EPC:SWto nonnalty open ( 1).
See Fig. 14-19 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 COlnmon supply air duct near the unit. The duct
remm air temperature (RAT) may be selected for display only
if the space temperature ofl;et (SPTO) is not used. When in-
stalling the sensor, the unit must be confimlred by setting
Configuration--+UNIT--+RAT.S to YES. The duct supply air
temperature (SAT) may be used to replace the SAT sensor that
is intemat to the unit. A supply duct SAT measurement is valid
for heating mode display while the thctory-standard internal
SAT is not valid for heating clue to its location upstremn of the
heating section. When installing the supply duct SAT, the unit
must be confimlred by setting Configuration-+UNIT---_gAT.H
to ENBL. A SAT sensor in the supply duct is the preferred con-
figuxation for systems with Carrier VVT,_R) c ontrols.
SPACE HUMIDITY SENSOR The space relative humidi-
ty sensor (part no. HL39ZZ005 duct mount or HL39ZZ007
walt 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. When installing the rela-
tive humidity sensor, the unit must be configured by setting
Cot*figuration --_UNIT--_RIt.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 confimlred for electric heat by
setting Configuration-+HEAT--->HT.. TY to a value of 2.
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