Carrier 48HC installation instructions Typical 3/4-in NPT Field Supplied Piping Parts

Page 17

Table 2 – Typical 3/4-in NPT Field Supplied Piping Parts

Item

Qty

CPN

Description

 

 

 

 

1

1

CA15RA201

90 Deg Street Elbow

 

 

 

 

2

1

CA01CA226

5 Inch Long Nipple

5

4

3

2

6

 

 

 

 

1

 

 

 

3

1

CA85RA201

Ground--- Joint Union

 

 

 

 

4

1

CA01CA218

3 Inch Long Nipple

 

 

 

 

5

1

CA05RA201

90 Deg Elbow

 

 

 

 

6

1

CA01CA250

12 Inch Long Nipple

 

 

 

 

7

1

CA05RA201

90 Deg Elbow

 

 

 

 

8

1

CA01CA218

3 Inch Long Nipple

 

 

 

 

9

1

CA20RA201

TEE

 

 

 

 

10

1

CA01CN222

4 Inch Long Nipple (Sediment Trap)

 

 

 

 

11

1

CA38RA201

Cap

 

 

 

 

12

1

CA01CA220

3 1/2 Inch Long Nipple

13

1

GB30

NIBCOR Ball Valve

7

8

9

10

11

12

13

15

14

14

1

CA01CA238

8 Inch Long Nipple

 

 

 

 

15

1

CA05RA201

90 Deg Elbow

Pipe gas supply into 90 degree elbow item 15 (see Table 2) through the hole in the unit basepan.

For typical 3/4 inch NPT field supplied fittings required for NON Thru-Base gas supply starting from the unit gas valve, omit items 14 and 15 from Table 2 and pipe gas supply into TEE. See Fig. 18.

Table 3 – Natural Gas Supply Line Pressure Ranges

UNIT MODEL

UNIT SIZE

MIN

MAX

 

 

 

 

 

 

48HC**

17, 20, 24, 28

5.0 in. wg

13.0 in. wg

 

(1246 Pa)

(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. Do not use a pipe smaller than the size specified. 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 two ways: horizontally from outside the unit (across the roof), or through unit basepan. Observe clearance to gas line components per Fig. 19.

 

 

 

C10999

48HC

Fig. 17 - Gas Supply Line Piping with Thru-Base

5

4

3

2

 

6

 

 

 

 

 

1

 

 

 

 

 

7

8 9 12

1310

11

 

 

 

 

 

 

 

C101006

Fig. 18 - Gas Supply Line Piping

 

 

 

 

 

 

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

Fig. 19 - Gas Piping Guide

C11121

17

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Contents Installation Instructions Safety Considerations Unit Dimensional Drawing 17 Size Unit C10897 Unit Dimensional Drawing 20 and 24 Size Units C10893 Unit Dimensional Drawing 28 Size Unit C10901 Roof Mount Operating WeightsPlan for Unit Location Provide Unit Support Plan for Sequence of Unit InstallationInspect unit Roof Curb Details 17 Size Unit Roof Curb Details 20 and 24 Size Units Roof Curb Details 28 Size Unit Rig and Place Unit Field Fabricate DuctworkPositioning on Curb Install Outside Air Hood Factory OptionHorizontal Duct Connection Install Gas Piping Install Flue Hood and Combustion Air HoodTo assemble the outside air hood Gas Supply LineNatural Gas Supply Line Pressure Ranges Typical 3/4-in NPT Field Supplied Piping PartsOrifice Hole Factory-Option Thru-Base ConnectionsMake Electrical Connections Install External Condensate Trap and LineField Power Supply All Units Units with Factory-Installed DisconnectPowered Convenience Outlet Wiring Units without Thru-Base Connections Field Control WiringThermostat Unit without Thru-Base Connection KitTypical Low-Voltage Control Connections Transformer Connection for 208-v Power SupplyHumidi-MiZer Space RH Controller Humidi-MiZerRControl ConnectionsTo connect the Carrier humidistat HL38MG029 To connect the Thermidistat device 33CS2PPRH-01OAT RRS Srtn PremierLink Controller PremierLinkt Factory-OptionPremierLink Wiring Schematic PremierLink Wiring Schematic with Humidi-MiZerR Field Connections Supply Air Temperature SAT SensorEconoMi$er2 PremierLink Sensor UsageThermostat Mode Space Sensor ModeSpace Sensors Configure the Unit for Thermostat ModeIndoor Air Quality CO2 Sensor Economizer ControlsTo wire the sensor Space Relative Humidity Sensor InstallationSupply Fan Status Switch Filter Status SwitchPower Exhaust output Smoke Detector/Fire Shutdown FSDRecommended Cables Connecting CCN Bus Color Code RecommendationsCCN Communication Bus RTU Open Multi-Protocol Control Board RTU Open Control SystemRTU Open System Control Wiring Diagram RTU Open System Control Wiring Diagram with Humidi-MiZerR Type of I/O Connection PIN Name Numbers Dedicated Inputs RTU Open Controller Inputs and OutputsRTU Open T-55 Sensor Connections Space Temperature SPT SensorsRelative Humidity Sensors Space or Duct Mounted Space Relative Humidity Sensor Typical WiringConnecting Discrete Inputs Duct Relative Humidity Sensor Typical WiringGeneral Communication Wiring ProtocolsRTU Open Troubleshooting Local AccessDifferential Enthalpy Control Outdoor Air Enthalpy ControlLEDs Smoke Detectors WiringReturn Air Sensor Tube Installation Unit Wire/Fuse or Hacr Breaker Sizing Data To install the return air sensor sampling tubeSmoke Detector Test Magnet Additional Application DataUnit NOM IFM FAN Motor Exhaust Unbalanced 3-Phase Supply Voltage Install Accessories Adjust Factory-Installed OptionsEconoMi$er IV Occupancy Switch Pre-Start and Start-Up48HC Catalog No 48HC---11SI

48HC specifications

The Carrier 48HC is a highly efficient rooftop HVAC unit designed for commercial applications that prioritize both performance and energy savings. This unit embodies Carrier's commitment to innovation by integrating advanced technologies and features that address the modern demands of building climate control.

One of the standout features of the Carrier 48HC is its exceptional energy efficiency. Employing the latest in variable-speed compressor technology, the unit adjusts its output based on the specific cooling needs of the space, which not only enhances comfort levels but also significantly reduces energy consumption. This feature is crucial for businesses looking to lower their operational costs while minimizing their environmental impact.

The Carrier 48HC is also equipped with a comprehensive range of control options. Through its intelligent control systems, users can utilize features such as demand ventilation, which optimizes indoor air quality while maintaining energy efficiency. The integration with building management systems (BMS) further enhances operational effectiveness, allowing real-time monitoring and adjustments from a centralized point.

Additionally, the 48HC is designed with durability in mind. Its robust construction resists harsh weather conditions and ensures long-lasting performance. The unit features advanced corrosion-resistant materials and coatings, which prolong its lifespan and reduce maintenance needs. This durability makes the 48HC a reliable choice for varying environments, whether it’s an industrial setting or a more delicate commercial space.

The unit’s compact design also deserves mention, as it facilitates easier installation on rooftops without taking up excessive space. The modular design allows for customization, enabling businesses to tailor their systems to fit specific heating and cooling requirements.

In terms of comfort, the Carrier 48HC employs efficient air distribution technology that ensures even airflow throughout the space. This greatly enhances occupant comfort by eliminating hot or cold spots, promoting a consistent indoor climate.

Finally, the 48HC complies with stringent environmental regulations and standards. With options for environmentally-friendly refrigerants, it supports businesses in their sustainability efforts while operating effectively under current regulations.

In summary, the Carrier 48HC stands out in the crowded HVAC market due to its advanced technology, energy efficiency, durability, and adaptability for commercial applications, making it a top choice for those looking to invest in a reliable and effective climate control solution.
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