Accessory Control Components - Carrier Weathermaster 48P030-100 Controls, Start-Up, Operation, Service, And Troubleshooting

Table 119 — Thermistors and Unit Operation Control Pressure Transducers
SENSOR
Thermistors
Cooling Coil Thermistor input. Provided with factory-option hydronic heat. Located on face of the hydronic heating
CCT
coil. Consists of 4 thermistors wired into a 2x2 array.
Limit Switch Thermistor. Provided with Staged Gas Control option. Located in the heating 
LST
compartment.
OAT Outside Air Thermistor. Located in top of the return plenum, attached to roof pole.
Return Air Thermistor.
RAT Without Economizer: Located on left side base rail in the return plenum.
With Economizer: Located on left side face of return damper section in the return plenum.
Supply Air Thermistor. Located in the Supply Fan section, on left side of the fan housing. 
SAT
(May be relocated or replaced when unit is used with CCN Linkage systems; see page 71.)
Leaving Air Thermistors, provided with Staged Heat Control option. Shipped in the control box.
LAT 1,2,3
Installer must pull out and mount in the supply duct.
Control Pressure Transducers
Building Pressure. Provided with Modulating Power Exhaust, High-Capacity Power Exhaust 
BP
and Return Fan options. Located in the auxiliary control box (left-hand side of unit near return plenum).
DPT-A Discharge Pressure (refrigerant), Circuit A.
DPT-B Discharge Pressure (refrigerant), Circuit B.
SPT-A Suction Pressure (refrigerant), Circuit A.
SPT-B Suction Pressure (refrigerant), Circuit B.
Duct Static Pressure. Provided with VAV models equipped with VFD or Inlet Guide Vane options. Located in the
DSP
auxiliary control box (right-hand side of unit near return plenum).
Supply Air Cfm (velocity pressure). Provided with factory-option return fan system. Located in the supply fan
FT_SF
compartment, on right side, on vertical post.
Return Air Cfm (velocity pressure). Provided with factory-option return fan system. Located in auxiliary control box
FT_RF
(right-hand side, filter access panel).
Outside Air CFM Outside Air Cfm Monitor (velocity pressure). Provided with the Outside Air Cfm Control option. Located in auxiliary
Control control box (right-hand side, filter access panel).
Digital Scroll Discharge Temperature Thermistor. Provided with digital scroll compressor option. Located on
DTT
discharge line.
RGTA Circuit A Return Gas Thermistor. Provided with MLV option. Located in suction line well.
LEGEND
MLV — Minimum Load Valve
VAV — Variable Air Volume
VFD — Variable Frequency Drive
FAN STATUS SWITCH
The units can be equipped with an optional fan status switch that
will monitor the pressure rise across the indoor fans.
RETURN AIR CO SENSOR
2
The unit can be equipped with a return air IAQ CO
used for the demand-controlled ventilation. The sensor is located
in the return air section and can be accessed from the filter access
door.
BOARD ADDRESSES
Each board in the system has an address. The MBB has a default
address of 1 but it does have an instance jumper that should be set
to 1, as shown in Fig. 31. For the other boards in the system, there
is a 4-dip switch header on each board that should be set as shown
below.
BOARD SW1
RXB 0
EXB 1
SCB 0
CEM 0
0 = On; 1 = Off
PHASE LOSS PROTECTION MONITOR OPTION (PMO)
If all 3 phases of electrical supply are relatively equal and in prop-
er sequence, the normally open contacts (Y/Y-OUT) will close
when 24 volts are applied between C and Y terminals. If the
phases are out of sequence, or if one is missing, the contacts will
never close. If a phase is lost while the phase monitor is energized,
DESCRIPTION AND LOCATION
sensor that is
2
SW2 SW3 SW4
0 0 0
0 0 0
0 0 0
0 0 0
the contacts will open immediately and will remain open until the
error is corrected.

Accessory Control Components

In addition to the factory-installed options, the units can also be
equipped with several field-installed accessories that expand the
control features of the unit. The following hardware components
can be used as accessories.
ROOM THERMOSTATS
ComfortLink controls support a conventional electro-mechanical
or electronic thermostat that uses the Y1, Y2, W1, W2, and G sig-
nals. The control also supports an additional input for an occupied/
unoccupied command that is available on some new thermostats.
The ComfortLink controls can be configured to run with up to
6 stages of capacity. The room thermostat is connected to TB201.
ComfortLink controls also support the use of space temperature
sensors and can be used with the T55 and T56 sensors. The con-
trols can also be used with CCN communicating T58 room sensor.
The T55 and T56 sensors are connected to TB201 terminals 1, 2,
and 3. The T58 sensor is connected to the CCN connections on
COMM board. Whenever a unit equipped with heat is operated
without a thermostat, the user must install the red jumpers from R
to W1, and W2 on TB201 for the heat function to work correctly.
SPACE CO SENSORS
2
The ComfortLink controls also support a CO
be located in the space for use in demand ventilation. The sensor
must be a 4 to 20 mA sensor and should be connected to TB201
terminals 7 and 8.
155
PART NO.
HH79NZ039 (4)
HH79NZ034
HH79NZ039
HH79NZ039
HH79NZ039
HH79NZ034 (3)
HK05ZG022
HK05ZZ001
HK05ZZ001
HK05SZ003
HK05SZ003
HK05ZG019
HK05ZG020 Forward Curve
HK05ZG019 Air Foil Fan
HK05ZG019
50ZZ400290 (030-070)
50ZZ400289 (075-100)
HH79EZ003
HH79NZ016 (030-060)
HH79NZ020 (070, 075)
HH79NZ014 (090, 100)
IAQ sensor that can
2