Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480221-01 Printed in U.S.A. Form 48HC-7-12-06SI Pg 1 1-19 Replaces: 48HC-7-12-05SI
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . . . 10
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . . . 11
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT
Step 5 — Field Fabricate Ductwork. . . . . . . . . . . . . . 13
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . 13
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and
Connect Ductwork (when required) . . . . . . . . . . 15
Step 8 — Install Outside Air Hood. . . . . . . . . . . . . . 15
• ECONOMIZER AND TWO-POSITION DAMPER
HOOD PACKAGE REMOVAL AND SETUP
• ECONOMIZER HOOD AND TWO-POSITION HOOD
ASSEMBLY
Step 9 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . 17
Step 10 — Install Gas Piping . . . . . . . . . . . . . . . . . . . 17
• FACTORY OPTION THRU-BASE CONNECTIONS
(GAS CONNECTIONS)
Step 11 — Install External Condensate Trap
and Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Step 12 — Make Electrical Connections . . . . . . . . . 20
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT OR HACR CIRCUIT
BREAKER
•ALL UNITS
• CONVENIENCE OUTLETS
• HACR CIRCUIT BREAKER
Page
• FACTORY-OPTION THRU-BASED CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
• FIELD CONTROL WIRING
• THERMOSTAT
•HUMIDI-MIZER
®
SYSTEM CONTROL
CONNECTIONS
• TYPICAL CONTROL WIRING DIAGRAMS
• ECONOMI$ER
®
X (FACTORY OPTION)
Smoke Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
• COMPLETING INSTALLATION OF RETURN AIR
SMOKE SENSOR
• ADDITIONAL APPLICATION DATA
Staged Air Volume (SAV™) with Variable
Frequency Drive (Factory Option) . . . . . . . . . . . . 50
ComfortLink Control (Factory Option) . . . . . . . . . . 50
PremierLink™ Controller (Factory Option) . . . . . . 50
RTU Open Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Controller Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
• LOW AMBIENT CONTROL (FACTORY OPTION)
Step 13 — Adjust Factory-Installed Options. . . . . 51
• SMOKE DETECTORS
• ECONOMI$ER
®
IV OCCUPANCY SWITCH
Step 14 — Install Accessories. . . . . . . . . . . . . . . . . . . 51
Step 15 — Check Belt Tension . . . . . . . . . . . . . . . . . . 51
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . 52
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service agency,
or your distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the
individual instructions packaged with the kits or accessories
when installing.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and appropriate national electrical codes
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.
48HC units for installation in the United States contain use of Carrier's Staged Air Volume (SAV™) 2-speed
indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of
2018.
48HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor
fan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency
standard of 2018.
For specific details on operation of the Carrier SAV 2-speed indoor fan system refer to the Variable
Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and
Troubleshooting manual.
WeatherMaster
®
48HC07-12
Single Package Rooftop Gas Heat/Electric Cooling Unit
with Puron
®
(R-410A) Refrigerant
To Next Page
Need help?
General
