Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480254-01 Printed in U.S.A. Form 48HC-4-6-03SI Pg 1 1-2020 Replaces: 48HC-4-6-02SI
Installation Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
MODEL NUMBER NOMENCLATURE AND
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rated Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 1 — Plan for Unit Location . . . . . . . . . . . . . . . 10
• ROOF MOUNT
Step 2 — Plan for Sequence of Unit Installation . . 10
• CURB-MOUNTED INSTALLATION
• PAD-MOUNTED INSTALLATION
• FRAME-MOUNTED INSTALLATION
Step 3 — Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 4 — Provide Unit Support . . . . . . . . . . . . . . . . 10
• ROOF CURB MOUNT
• SLAB MOUNT (HORIZONTAL UNITS ONLY)
• ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
Step 5 — Field Fabricate Ductwork . . . . . . . . . . . . . 12
Step 6 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 12
• POSITIONING ON CURB
Step 7 — Convert to Horizontal and Connect
Ductwork (When Required) . . . . . . . . . . . . . . . . . 13
Step 8 — Install Outside Air Hood . . . . . . . . . . . . . . 14
• ECONOMIZER AND TWO POSITION DAMPER HOOD
PACKAGE REMOVAL AND SETUP (FACTORY
OPTION)
• ECONOMIZER AND TWO-POSITION HOOD
Step 9 — Units with Hinged Panels Only . . . . . . . . 15
Step 10 — Install Flue Hood . . . . . . . . . . . . . . . . . . . 15
Step 11 — Install Gas Piping . . . . . . . . . . . . . . . . . . 16
• FACTORY OPTION THRU-BASE CONNECTIONS
(GAS CONNECTIONS)
Step 12 — Install External Condensate Trap and
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Step 13 — Make Electrical Connections . . . . . . . . . 19
• FIELD POWER SUPPLY
• UNITS WITH FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
• UNITS WITHOUT FACTORY-INSTALLED NON-
FUSED DISCONNECT OR HACR
• ALL UNITS
• CONVENIENCE OUTLETS
• HACR AMP RATING
• FACTORY-OPTION THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• UNITS WITHOUT THRU-BASE CONNECTIONS
(ELECTRICAL CONNECTIONS)
• FIELD CONTROL WIRING
• THERMOSTAT
• HEAT ANTICIPATOR SETTINGS
• HUMIDI-MIZER® CONTROL CONNECTIONS
• LOW AMBIENT CONTROL (FACTORY OPTION)
• INTEGRATED GAS CONTROLLER
• COMFORTLINK (FACTORY OPTION)
• TYPICAL WIRING DIAGRAMS
Economi$er® X (Factory Option) . . . . . . . . . . . . . . .41
• SYSTEM COMPONENTS
• SPECIFICATIONS
•INPUTS
•OUTPUTS
• ENVIRONMENTAL
• ECONOMIZER MODULE WIRING DETAILS
• INTERFACE OVERVIEW
• SETUP AND CONFIGURATION
• ENTHALPY SETTINGS
• CHECKOUT
• TROUBLESHOOTING
PremierLink™ (Factory Option) . . . . . . . . . . . . . . . .51
RTU Open Controller (Factory-Installed Option) . .51
Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
• COMPLETING RETURN AIR SMOKE SENSOR
INSTALLATION
• ADDITIONAL APPLICATION DATA
Step 14 — Adjust Factory-Installed Options . . . . . .53
• SMOKE DETECTORS
• ECONOMI$ER IV OCCUPANCY SWITCH
Step 15 — Install Accessories . . . . . . . . . . . . . . . . .53
Step 16 — Check Belt Tension . . . . . . . . . . . . . . . . .53
• BELT FORCE — DEFLECTION METHOD
• BELT TENSION METHOD
Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . .54
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the litera-
ture, tags and labels attached to the unit, and other safety precau-
tions that may apply.
Follow all safety codes, including ANSI (American National Stan-
dards Institute) Z223.1. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in in-
structions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
WeatherMaster
®
48HC**04-06 Single Package Rooftop
Gas Heating/Electric Cooling Unit
with Puron
®
(R-410A) Refrigerant
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