Page 1: Table Of Contents
48HC Single Package Rooftop Gas Heating/Electric Cooling Unit with Puronr (R --- 410A) Refrigerant Sizes: 17, 20, 24, 28 Installation Instructions NOTE: Read the entire instruction manual before starting the installation TABLE OF CONTENTS SAFETY CONSIDERATIONS ....INSTALLATION .
Page 2: Safety Considerations
Field Connections ......Space Temperature (SPT) Sensors Indoor Air Quality (CO ) Sensor Outdoor Air Quality Sensor .
Page 3 C10896 Fig. 1 - - Unit Dimensional Drawing – 17 Size Unit...
Page 4 C10897 Fig. 1 - - Unit Dimensional Drawing – 17 Size Unit (cont.)
Page 5 C10892 Fig. 2 - - Unit Dimensional Drawing – 20 and 24 Size Units...
Page 6 C10893 Fig. 2 - - Unit Dimensional Drawing – 20 and 24 Size Units (cont.)
Page 7 C10900 Fig. 3 - - Unit Dimensional Drawing – 28 Size Unit...
Page 8 C10901 Fig. 3 - - Unit Dimensional Drawing – 28 Size Unit (cont.)
Page 9: Installation
INSTALLATION Jobsite Survey Complete the following checks before installation. 1. Consult local building codes and the NEC (National Electrical Code) ANSI/NFPA 70 for special installa- tion requirements. 2. Determine unit location (from project plans) or select unit location. 3. Check for possible overhead obstructions which may interfere with unit lifting or rigging.
Page 10: Step 2 - Plan For Sequence Of Unit Installation
Step 2 — Plan for Sequence of Unit Installation The support method used for this unit will dictate different sequences for the steps of unit installation. For example, on curb- - mounted units, some accessories must be installed on the unit before the unit is placed on the curb. Review the following for recommended sequences for installation steps.
Page 11 C10954 Fig. 6 - - Roof Curb Details – 17 Size Unit...
Page 12 C10955 Fig. 7 - - Roof Curb Details – 20 and 24 Size Units...
Page 13 C10956 Fig. 8 - - Roof Curb Details – 28 Size Unit...
Page 14: Step 5 - Field Fabricate Ductwork
MAXIMUM ALLOWABLE DIFFERENCE IN. (MM) 0.25” (6) 0.5” (12) Fig. 9 - - Unit Leveling Tolerances Step 5 — Field Fabricate Ductwork Cabinet return-air static pressure (a negative condition) shall not exceed 0.5 in. wg (87 Pa) with economizer or without economizer.
Page 15: Positioning On Curb
Positioning on Curb — Position unit on roof curb so that the following clearances are maintained: in. (6 mm) clearance between the roof curb and the base rail inside the right and left, (12 mm) clearance between the roof curb and the base rail inside the front and back.
Page 16: Step 9 - Install Flue Hood And Combustion Air Hood
To assemble the outside air hood: 1. Remove hood top panel from shipping position on unit end. 2. Install four angles to the upper end panel using the screws provided. 3. Apply seal strip to mating flanges on the side plates of the hood (see Fig.
Page 17 Table 2 – Typical - - in NPT Field Supplied Piping Parts Item Description CA15RA201 90 Deg Street Elbow CA01CA226 5 Inch Long Nipple CA85RA201 Ground --- Joint Union CA01CA218 3 Inch Long Nipple CA05RA201 90 Deg Elbow CA01CA250 12 Inch Long Nipple CA05RA201 90 Deg Elbow CA01CA218...
Page 18: Factory- - Option Thru- - Base Connections
Factory- - Option Thru- - Base Connections — Electrical Connections: Knockouts are located in the control box area. Remove the appropriate size knockout for high voltage connection. Use the field supplied connector depending on wiring or conduit being utilized. Remove the - - in (22mm) knockout and appropriate connector for low voltage wiring.
Page 19: Step 11 - Install External Condensate Trap And Line
Step 11 — Install External Condensate Trap and Line The unit has one -in. condensate drain connection on the end of the condensate pan (see Fig. 21). See Figs. 1, 2 and 3, item “E”, in the view labeled “BACK (HORIZONTAL DISCHARGE)”...
Page 20: Units Without Factory- - Installed Disconnect
Failure to follow this caution may result in equipment damage. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty. Units Without Disconnect Option Disconnect A93033 208/230-3-60...
Page 21 Two types of convenience outlets are offered on 48HC models: Non- - unit powered and unit- - powered. Both types provide a 125- - volt GFCI (ground- - fault circuit- - interrupter) duplex receptacle rated at 15- - A behind a hinged access cover, located on the corner panel of the unit.
Page 22: Factory- - Option Thru- - Base Connections
This device can be a thermostat (field- - supplied) or a PremierLink controller (available as factory- - installed option or as field- - installed accessory, for use on a Carrier Comfort Network or as a stand alone control) or the RTU...
Page 23: Heat Anticipator Settings
Terminal Typical Thermostat Corrections Caution O/B/Y2 (see Note) T–STAT Note: Typical multi-function marking. Follow manufacturer’s configuration instructions to select Y2. Field Wiring CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may cause a short circuit. Carefully check the connection of control coductor for indoor fan control at terminal G.
Page 24: Humidi- - Mizer R Control Connections
(units with PremierLinkt control). To connect the Carrier humidistat (HL38MG029): 1. Route the humidistat 2- - conductor cable (field- - sup- plied) through the hole provided in the unit corner post.
Page 25 Fig. 34 - - Typical Humidi- - MiZer Adaptive Dehumidification System Humidistat Wiring EDGE Pro THERMIDISTAT O/W2/B SRTN Fig. 35 - - Typical Rooftop Unit with Humidi- - MiZer Adaptive Dehumidification System with EDGE Pro Thermidistat Device Unit CTB THERMOSTAT Humidi-MiZer™...
Page 26: Premierlinkt (Factory Option)
The outdoor air temperature (OAT) sensor is included in the FIOP/accessory EconoMi$ert2 package. (See page 45 for accessory enthalpy controls.) The PremierLink controller requires the use of a Carrier electronic thermostat or a CCN connection for time broadcast to initiate its internal timeclock. This is necessary for broadcast of time of day functions (occupied/unoccupied).
Page 27 C11140 Fig. 38 - - PremierLink Wiring Schematic...
Page 28 C11141 Fig. 39 - - PremierLink Wiring Schematic with Humidi- - MiZer...
Page 29: Supply Air Temperature (Sat) Sensor
Supply Air Temperature (SAT) Sensor — On FIOP- - equipped 48HC unit, the unit is supplied with a supply- - air temperature (SAT) sensor (33ZCSENSAT). This sensor is a tubular probe type, approx 6- - inches (12.7 mm) in length. It is a nominal 10- - k ohm thermistor. The SAT is factory- - wired.
Page 30 OAQ ---SEN/RH ---SEN CCN Gnd (WHT) AUX OUT(Power Exhaust) LEGEND: --- Space Temperature Sensor --- Space Temperature Sensor --- Carrier Comfort Network (communication bus) CMPSAFE --- Compressor Safety FILTER --- Dirty Filter Switch --- Fire Shutdown --- Indoor Air Quality (CO...
Page 31: Space Sensors
Space Sensors — The PremierLink controller is factory- - shipped configured for Space Sensor Mode. A Carrier T- - 55 or T- - 56 space sensor must be used. T- - 55 space temperature sensor provides a signal of space temperature to the PremierLink control.
Page 32: Economizer Controls
Economizer Controls Indoor Air Quality (CO ) Sensor — The indoor air quality sensor accessory monitors space carbon dioxide (CO ) 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.
Page 33: Space Relative Humidity Sensor Or Humidistat Connections
HOLES Fig. 50 - - Space Relative Humidity Sensor Installation The sensor must be mounted vertically on the wall. The Carrier logo should be orientated correctly when the J5-2 sensor is properly mounted. Avoid corner locations. Allow at least 4 ft between the J5-3 sensor and any corner.
Page 34: Smoke Detector/Fire Shutdown (Fsd)
Smoke Detector/Fire Shutdown (FSD) — This function is available only when PremierLink is configured for (Space) Sensor Mode. The unit is factory- - wired for PremierLink FSD operation when PremierLink is factory- - installed. On 48HC units equipped with factory- - installed Smoke Detector(s), the smoke detector controller implements the unit shutdown through its NC contact set connected to the unit’s CTB input.
Page 35: Ccn Communication Bus
1000- - ft section. Optically isolated RS- - 485 repeaters are required every 1000 ft (305 m). NOTE: Carrier device default is 9600 baud. Communications Bus Wire Specifications: The CCN Communication Bus wiring is field- - supplied and field- - installed.
Page 36: Rtu Open Control System
RTU Open enables the unit to run in 100% stand- - alone control mode, Carrier’s I- - Vu Open network, or a Third Party Building Automation System (BAS). On- - board DIP switches allow you to select your protocol (and baud rate) of choice among the four most popular protocols in use today: BACnet, Modbus, Johnson N2 and LonWorks.
Page 37 C11142 Fig. 58 - - RTU Open System Control Wiring Diagram...
Page 38 C11143 Fig. 59 - - RTU Open System Control Wiring Diagram with Humidi- - MiZer...
Page 39: Supply Air Temperature (Sat) Sensor
Parallel pins J5 ---1 = J2 ---6, J5 ---3 = J1 ---10, J5 ---5 = J1 ---2 are used for field---installation. The RTU Open controller requires the use of a Carrier space sensor. A standard thermostat cannot be used with the RTU Open system.
Page 40: Space Temperature (Spt) Sensors
Phoenix connectors and then reconnect the connectors to the board. Space Temperature (SPT) Sensors — There are two types of SPT sensors available from Carrier, resistive input non-communicating (T55, T56, and T59) and Rnet communicating (SPS, SPPL, SPP, and SPPF) sensors.
Page 41: Outdoor Air Quality Sensor
isolated 24 vac power source to the sensor and to connect the sensor to the control board terminals. To connect the sensor to the control, identify the positive (4 to 20 mA) and ground (SIG COM) terminals on the sensor. See Fig. 46. Connect the 4- - 20 mA terminal to RTU Open terminal J4- - 2 and connect the SIG COM terminal to RTU Open terminal J4- - 3.
Page 42: Smoke Detector/Fire Shutdown (Fsd)
J4-1 or J4-4 + 24 VDC Supply Voltage J4-2 or J4-5 (-) 4 to 20 mA Current Loop Output to RTU-OPEN Fig. 66 - - Duct Relative Humidity Sensor Typical Wiring Humidistat: The accessory humidistat provides the RTU Open insight to the relative humidity in the space. The humidistat reads the RH level in the space and compares it to its setpoint to operate a dry contact.
Page 43: Communication Wiring - - Protocols
Communication Wiring - - Protocols General — Protocols are the communication languages spoken by control devices. The main purpose of a protocol is to communicate information in the most efficient method possible. Different protocols exist to provide different kinds of information for different applications. In the BAS application, many different protocols are used, depending on manufacturer.
Page 44: Local Access
Local Access — BACview Handheld: The BACview interface used to connect to the RTU Open to access the control information, read sensor values, and test the RTU, see Fig. 70. This is an accessory interface that does not come with the RTU Open controller and can only be used at the unit.
Page 45: Outdoor Air Enthalpy Control
The LEDs on the RTU Open Control Board (see Fig. 57) show the status of certain functions: If this LED is on... Status is... Power RTU Open has power RTU Open is receiving data from the network segment RTU Open is transmitting data over the network segment The digital output is active The Run and Error LEDs indicate control module and network status If Run LED shows...
Page 46: Smoke Detectors
– 4-20 Main + VDC Outside Air Enthalpy Switch + 24-36 Return Air VDC In Enthalpy Sensor – 4-20 Main Fig. 72 - - Outside and Return Air Enthalpy Sensor Wiring To wire the return air enthalpy sensor, perform the following: 1.
Page 47: Smoke Detector Test Magnet
To install the return air sensor sampling tube: 1. Remove the tube from its shipping location. 2. Open the unit end to access the return air sensor (loc- ated on right- - hand partition) 3. Orient the tube’s sampling holes into the return air flow direction.
Page 48 Table 11 - - Unit Wire/Fuse or HACR Breaker Sizing Data (cont) COMBUSTION FAN MOTOR NOM. V--- Ph--- Hz TYPE 208/230 ---3 ---60 0.52 HIGH 460 ---3 ---60 HIGH 575 ---3 ---60 0.24 HIGH 208/230 ---3 ---60 0.52 HIGH 460 ---3 ---60 HIGH 575 ---3 ---60 0.24...
Page 49 Legend and Notes for Table 11 LEGEND: BRKR --- Circuit breaker --- Convenience outlet DISC --- Disconnect --- Full load amps --- Locked rotor amps --- Minimum circuit amps --- Power exhaust PWRD CO --- Powered convenient outlet UNPWR CO --- Unpowered convenient outlet NOTES: 1.
Page 50: Step 13 - Adjust Factory- -Installed Options
Economizer Step 13 — Adjust Factory- -Installed Options EconoMi$er IV Occupancy Switch — Refer to Fig. 76 for general EconoMi$er IV wiring. External occupancy control is managed through a connection on the Central Terminal Board. If external occupancy control is desired, connect a time clock or remotely controlled switch (closed for Occupied, open for Unoccupied sequence) at terminals marked OCCUPANCY on CTB.
Page 52 Catalog No: 48HC ---11SI Copyright 2011 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 04/11 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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48tc*d 48hc17 48hc20 48hc24 48hc28

Carrier SINGLE PACKAGE ROOFTOP 48HC Installation Instructions Manual

The Installation

Safety Considerations

Installation

Humidi- - Mizer R Control Connections

Premierlinkt (Factory Option)

Field Connections

Economizer Controls

RTU Open Control System

Step 13 - Adjust Factory- -Installed Options

Step 14 - Install Accessories

Quick Links

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