Carrier 50TC installation instructions Economizer controls, Enthalpy Switch HH57AC077 Connections

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When the PremierLink is configured for Thermostat Mode, these functions are not available: Fire Shutdown (FSD), Remote Occupied (RMTOCC), Compressor Safety (CMPSAFE), Supply Fan Status (SFS), and Filter Pressure Switch (FILTER).

Economizer controls —

Outdoor Air Enthalpy Control (PNO HH57AC077) -

The enthalpy control (HH57AC077) is available as a field-installed accessory to be used with the EconoMi$er2 damper system. The outdoor air enthalpy sensor is part of the enthalpy control. (The separate field-installed accessory return air enthalpy sensor (HH57AC078) is required for differential enthalpy control. See Fig. 35.)

Locate the enthalpy control in the economizer hood. Locate two GRA leads in the factory harness and connect these leads to enthalpy control sensors 2 and 3. See Fig. 35. Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to TR) and BLK (connect to TR1).

Enthalpy

 

CTB

 

ECON

Switch

 

 

 

2

GRA

6

3

GRA

7

Factory Wiring Harness

C08218

Fig. 35 - Enthalpy Switch (HH57AC077) Connections

The outdoor enthalpy changeover setpoint is set at the enthalpy controller.

Differential Enthalpy Control — Differential enthalpy control is provided by sensing and comparing the outside air and return air enthalpy conditions. Install the outdoor air enthalpy control as described above. Add and install a return air enthalpy sensor.

Return Air Enthalpy Sensor — Mount the return-air enthalpy sensor (HH57AC078) in the return-air duct. The return air sensor is wired to the enthalpy controller (HH57AC077). See Fig. 36.

ENTHALPY CONTROLLER

RED

 

S (OUTDOOR

 

 

 

 

+

AIR

 

 

 

BRN

 

A B C

TR

TR1

BLK

ENTHALPY

 

 

SENSOR)

D

SO

+

 

RED

 

 

 

SR

+

 

 

S (RETURN AIR

 

 

 

 

 

+

ENTHALPY

 

2

3

 

 

 

SENSOR)

 

1

 

GRAY/ORN

 

 

 

 

 

 

 

LED

 

 

 

 

WIRE HARNESS

 

 

 

GRAY/RED

IN UNIT

 

 

 

 

 

 

 

 

 

 

 

 

NOTES:

 

 

 

 

 

 

1.Remove factory-installed jumper across SR and + before connecting wires from return air sensor.

2.Switches shown in high outdoor air enthalpy state. Terminals 2 and 3 close on low outdoor air enthalpy relative to indoor air enthalpy.

3.Remove sensor mounted on back of control and locate in outside airstream.

C06019

Fig. 36 - Outside and Return Air Enthalpy Sensor

Wiring

To wire the return air enthalpy sensor, perform the following:

1.Use a 2-conductor, 18 or 20 AWG, twisted pair cable to connect the return air enthalpy sensor to the enthal- py controller.

2.At the enthalpy control remove the factory-installed resistor from the (SR) and (+) terminals.

3.Connect the field-supplied RED wire to (+) spade connector on the return air enthalpy sensor and the (SR+) terminal on the enthalpy controller. Connect the BLK wire to (S) spade connector on the return air enthalpy sensor and the (SR) terminal on the enthalpy controller.

NOTE: The enthalpy control must be set to the “D” setting for differential enthalpy control to work properly.

Indoor Air Quality (CO2 sensor) — The indoor air quality sensor accessory monitors space carbon dioxide (CO2) levels. This information is used to monitor IAQ levels. Several types of sensors are available, for wall mounting in the space or in return duct, with and without LCD display, and in combination with space temperature sensors. Sensors use infrared technology to measure the levels of CO2 present in the space air.

The CO2 sensors are all factory set for a range of 0 to 2000 ppm and a linear mA output of 4 to 20. Refer to the instructions supplied with the CO2 sensor for electrical requirements and terminal locations. See Fig. 37 for typical CO2 sensor wiring schematic.

50TC

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Contents Installation Instructions 50TC Unit Dimensional Drawing 07 Size Units Unit Dimensional Drawing 07 Size Unit Unit Dimensional Drawing 08, 09 and 12 Size Units Roof mount Plan for Unit LocationProvide Unit Support Plan for Sequence of Unit InstallationInspect unit Roof Curb Details 07 Size Units Roof Curb Details 08 12 Size Units Unit Leveling Tolerances Field Fabricate DuctworkRig and Place Unit Convert to Horizontal and Connect Ductwork when requiredInstall Outside Air Hood Economizer Hood Removal and Setup Factory OptionEconomizer Hood and Two-Position Hood Two Position Damper Hood Removal and SetupFactory Option Make Electrical Connections Install External Condensate Trap and LineThru-Base Connections Units with Factory-Installed DisconnectAll units Thermostat Field Control WiringHeat Anticipator Settings Units without Thru-Base ConnectionsHeater Model Number Electric HeatersAccessory Electric Heater Control Connections PremierLink Controller PremierLinkt Factory-OptionPremierLink Wiring Schematic 33ZCT55SPT CRTEMPSN001A00 PremierLink Sensor UsageThermostat Mode Space Sensor Mode55 Space Temperature Sensor Wiring Economizer controls Enthalpy Switch HH57AC077 ConnectionsIndoor CO2 Sensor 33ZCSENCO2 Connections PremierLink Wiring Fan Pressure Switch Connection PremierLink Filter Switch ConnectionPremierLink CCN Bus Connections Color Code RecommendationsRTU-MP Multi-Protocol Control Board RTU-MP control systemRTU-MP System Control Wiring Diagram Type of I/O Connection PIN Name Numbers Inputs RTU-MP Controller Inputs and OutputsRTU-MP T-55 Sensor Connections Space Temperature SPT SensorsRTU-MP / Indoor CO2 Sensor 33ZCSENCO2 Connections Connecting Discrete Inputs Filter StatusRemote Occupancy Communication Wiring Protocols GeneralFan Status RTU-MP Troubleshooting Communication LEDs Local AccessLEDs on the RTU-MP show the status of certain functions LEDsPre-Start and Start-Up Adjust Factory-Installed OptionsInstall Accessories EconoMi$er IV Occupancy SwitchSTD Unit Wire/MOCP Sizing Data17.5 108 Disc 50TC Catalog No 50TC---C02SI

50TC specifications

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