Carrier 48TC**16 Install Gas Piping, Natural Gas Supply Line Pressure Ranges

Page 11

Step 10 — Install Gas Piping

Installation of the gas piping must be accordance with local building codes and with applicable national codes. In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC). In Canada, installation must be accordance with the CAN/CSA B149.1 and CAN/CSA B149.2 installation codes for gas burning appliances.

This unit is factory equipped for use with Natural Gas fuel at elevations up to 2000 ft (610 m) above sea level. Unit may be field converted for operation at elevations above 2000 ft (610 m) and/or for use with liquefied petroleum fuel. See accessory kit installation instructions regarding these accessories.

NOTE: In U.S.A. the input rating for altitudes above 2000 ft (610 m) must be derated by 4% for each 1000 ft (305 m) above sea level. In Canada the input rating must be derated by 10% for altitudes of 2000 ft (610 m) to 4500 ft. (1372 m) above sea level.

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

9” MINIMUM CLEARANCE

 

 

 

FOR PANEL REMOVAL

 

 

 

 

 

 

 

GAS

FROM

 

 

 

 

 

REGULATOR*

GAS

 

 

 

MANUAL GAS

METER

 

 

 

SHUTOFF VALVE*

 

 

BASE UNIT

 

 

 

 

 

 

 

 

 

 

 

48” MINIMUM

DRIP LEG

PER NFGC* BASE RAIL

ROOF

 

 

FIELD-

 

 

FABRICATED

CURB

 

 

 

 

SUPPORT*

 

 

 

 

 

 

LEGEND

 

 

NFGC – National Fuel Gas Code

 

 

*Field supplied.

 

 

NOTE: Follow all local codes.

 

 

 

 

STEEL PIPE

 

SPACING OF SUPPORTS

NOMINAL DIAMETER

 

X DIMENSION

(in.)

 

(ft)

1/2

 

 

6

3/4 or 1

 

8

11/4 or larger

 

10

For natural gas applications, gas pressure at unit gas connection must not be less than 5 in. wg (1250 Pa) or greater than 13 in. wg (3240 Pa) while the unit is operating. For liquified petroleum applications, the gas pressure must

Fig. 16 - Gas Piping Guide

Factory-Option Thru-Base Connections (Gas Connection) —

C11121

48TC**16

not be less than 11 in. wg (2740 Pa) or greater than 13 in. wg (3240 Pa) at the unit connection.

The gas supply pipe enters the unit at the burner access panel on the front side of the unit, through the long slot at the bottom of the access panel. The gas connection to the unit is made to the 3/4-in. FPT gas inlet port on the unit gas valve.

Table 2 – Natural Gas Supply Line Pressure Ranges

UNIT

MIN

MAX

 

 

 

 

 

48HC**14

5.0 in. wg (1250 Pa)

13.0 in. wg (3240 Pa)

 

 

 

 

 

 

 

 

!

CAUTION

 

 

 

 

 

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage to equipment.

When connecting the gas line to the unit gas valve, the installer MUST use a backup wrench to prevent damage to the valve.

Install a gas supply line that runs to the unit heating section. Refer to the NFPA 54/NFGC or equivalent code for gas pipe sizing data. Size the gas supply line to allow for a maximum pressure drop of 0.5-in wg (124 Pa) between gas regulator source and unit gas valve connection when unit is operating at high-fire flow rate.

The gas supply line can approach the unit in three ways: horizontally from outside the unit (across the roof), thru-curb/under unit basepan (accessory kit required) or through unit basepan (factory-option or accessory kit required). Consult accessory kit installation instructions for details on these installation methods. Observe clearance to gas line components per Fig. 16.

This service connection kit consists of a 3/4-in NPT gas adapter fitting (stainless steel), a 1/2-in electrical bulkhead connector and a 11/2-in electrical bulkhead connector, connected to an “L” bracket covering the embossed (raised) section of the unit basepan in the condenser section. See Fig. 17.

1/2” ELECTRICAL BULKHEAD

11/2” ELECTRICAL CONNECTOR

BULKHEAD

CONNECTOR

3/4” NPT GAS ADAPTER FITTING

C10905

Fig. 17 - Thru-the-Base Option, Shipping Position

1.Remove the “L” bracket assembly from the unit (see Fig. 17).

2.Cut and discard the wire tie on the gas fitting. Hand tighten the fitting if it has loosened in transit.

3.Remove connector plate assembly from the “L” bracket and discard the “L” bracket, but retain the washer head screws and the gasket (located between the “L” bracket and the connector plate assembly

NOTE: Take care not to damage the gasket, as it is reused in the following step.

4.Place the gasket over the embossed area in the basepan, aligning the holes in the gasket to the holes in the basepan. See Fig. 18.

5.Install the connector plate assembly to the basepan using 8 of the washer head screws.

11

Page 10 Page 12
Image 11
Page 10 Page 12
Contents Installation Instructions Personal Injury and Environmental Hazard Unit Operation and Safety HazardFIRE, Explosion Hazard Electrical Shock HazardUnit Dimensional Drawing 16 Size Unit Plan for Unit Location Service Clearance Dimensional DrawingProvide Unit Support Plan for Sequence of Unit InstallationInspect Unit Roof Curb Details Unit Damage Hazard Field Fabricate DuctworkRig and Place Unit Property Damage HazardPositioning on Curb Convert to Horizontal and Connect Ductwork when requiredTwo Position Damper Hood Removal and Setup Factory Option Install Outside Air HoodEconomizer Hood Removal and Setup Factory Option Economizer Hood and Two-Position Hood Install Flue HoodEquipment Damage Hazard Install Gas PipingNatural Gas Supply Line Pressure Ranges Completing Installation of Thru-the-Base Option Fire or Explosion Hazard Install External Condensate Trap and LineMake Electrical Connections Field Power SupplyUnits with Factory-Installed Disconnect Units Without Factory-Installed DisconnectElectrical Operation Hazard Power Wiring Connections Convenience OutletsUnit Powered Convenience Outlet Wiring Thermostat Field Control WiringFactory-Option Thru-Base Connections Electrical Connections Units without Thru-Base ConnectionsTypical Low-Voltage Control Connections Unit without Thru-Base Connection KitTo connect the Thermidistat device 33CS2PPRH-01 Humidi-MiZerRControl ConnectionsHumidi-MiZer Space RH Controller To connect the Carrier humidistat HL38MG029OAT RRS Srtn PremierLink Controller PremierLinkt Factory OptionPremierLink Wiring Schematic PremierLink Wiring Schematic with Humidi-MiZerR PremierLink Sensor Usage Supply Air Temperature SAT SensorField Connections EconoMi$er2Thermostat Mode Space Sensor ModeSpace Sensors Configure the unit for Thermostat ModeIndoor Air Quality CO2 sensor Economizer ControlsUnit Performance Hazard To wire the sensorSmoke Detector/Fire Shutdown FSD Filter Status SwitchSupply Fan Status Switch Power Exhaust outputRecommended Cables Connecting CCN Bus Color Code RecommendationsCCN Communication Bus RTU Open Multi-Protocol Control Board RTU Open Control SystemRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR Type of I/O Connection PIN Name Numbers Dedicated Inputs RTU Open Controller Inputs and OutputsRTU Open T-55 Sensor Connections Space Temperature SPT SensorsRelative Humidity Sensors Space or Duct Mounted Space Relative Humidity Sensor Typical WiringConnecting Discrete Inputs Duct Relative Humidity Sensor Typical WiringGeneral Communication Wiring ProtocolsRTU Open Troubleshooting Local AccessReturn Air Enthalpy Sensor Outdoor Air Enthalpy Control PNO 33CSENTHSWLEDs Differential Enthalpy ControlSensor Module Smoke DetectorsSystem ControllerReturn Air with Economizer See Completing Installation of Return Air SmokeSmoke Detector Locations Supply AirReturn Air Detector Shipping Position Completing Installation of Return Air Smoke SensorBrkr Unit Wire/Fuse or Hacr Breaker Sizing DataPre-Start and Start-Up Adjust Factory-Installed OptionsInstall Accessories EconoMi$er IV Occupancy Switch48TC**16 14SI

48TC**16 specifications

The Carrier 48TC**16 is a high-efficiency rooftop packaged unit, designed for commercial heating and cooling applications. This model exemplifies Carrier's commitment to delivering reliable and innovative solutions to the HVAC industry. With cutting-edge technology and robust performance characteristics, the 48TC**16 is ideally suited for a variety of building types.

One of the main features of the Carrier 48TC**16 is its impressive energy efficiency. The unit achieves high SEER (Seasonal Energy Efficiency Ratio) ratings, which translates to lower energy bills and reduced environmental impact. The unit is equipped with a scroll compressor, known for its quiet operation and reliability, ensuring a comfortable indoor environment without disruptive noise.

The 48TC**16 utilizes advanced microprocessor controls that enhance system performance by enabling precise temperature control and various operational modes. This allows users to optimize the system's performance based on specific heating and cooling needs. Additionally, the unit includes enhanced diagnostics, allowing for faster troubleshooting and easier maintenance, thus minimizing downtime and repair costs.

Another notable characteristic of the 48TC**16 is its robust construction. Built to withstand harsh weather conditions, the unit features a galvanized steel cabinet coated with a corrosion-resistant finish, ensuring longevity and durability. It also comes equipped with a variety of factory-installed options, such as economizers and filtration systems, which can further enhance its performance and flexibility.

The Carrier 48TC**16 is designed with sustainability in mind, using environmentally friendly refrigerants. The unit supports the latest refrigerant regulations, helping to reduce the overall carbon footprint of the building it serves.

Installation and service are simplified by the unit's modular design, which allows for easy access to all major components. This design not only streamlines maintenance procedures but also facilitates quick installation, making it an ideal choice for contractors and facility managers alike.

In summary, the Carrier 48TC**16 rooftop packaged unit combines high energy efficiency, advanced controls, robust construction, and eco-friendly features, making it a top choice for commercial heating and cooling needs. Its user-friendly design and reliability ensure optimal performance and comfort for various applications, underscoring Carrier's reputation as a leader in the HVAC industry. Whether for new construction or retrofitting, the 48TC**16 meets the demands of modern buildings while adhering to sustainability practices.
Top Page Image Contents