Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480274-01
Printed in U.S.A.
Form 48A-21SI
Pg 1
11-21
Replaces: 48A-20SI
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . . 3
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 1 — Provide Unit Support
. . . . . . . . . . . . . . . . . 4
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit
. . . . . . . . . . . . . . . . . . . 4
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork
. . . . . . . . . . . . . 22
Step 4 — Make Unit Duct Connections
. . . . . . . . . . 22
• 48A2, A3, A6, AND A7 UNITS
• 48A4, A5, A8, AND A9 UNITS
• 48A2020-050 UNITS
• 48A2060 UNITS
Step 6 — Trap Condensate Drain
. . . . . . . . . . . . . . 23
Step 7 — Install Gas Piping
. . . . . . . . . . . . . . . . . . . 23
• OPTIONAL STAGED GAS UNITS
Step 8 — Install Supply-Air Thermistors (Staged and
Modulating Gas Units Only) . . . . . . . . . . . . . . . . . 24
Step 9 — Make Electrical Connections
. . . . . . . . . . 24
• POWER WIRING
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 10 — Make Outdoor-Air Inlet Adjustments
. . 28
• ECONOMIZER AND FIXED OUTDOOR AIR DAMPER
Step 11 — Position Power Exhaust/Barometric Relief
Damper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Step 12 — Route VAV Static Pressure Sensors
. . . 32
• VAV DUCT PRESSURE TRANSDUCER
• VAV BUILDING PRESSURE TRANSDUCER
Step 13 — Install All Accessories
. . . . . . . . . . . . . . 32
• FIELD-FABRICATED WIND BAFFLES
• DUCTWORK
BACnet Communication Option Wiring . . . . . . . . . 35
• WIRING THE UPC OPEN CONTROLLER TO THE MS/
TP NETWORK
• MS/TP WIRING RECOMMENDATIONS
Using ZS Sensor or an Equipment Touch . . . . . . . 37
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
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes. 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
instructions 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.
WARNING
Before performing service or maintenance operations on unit,
turn off main power switch to unit. Electrical shock could
cause personal injury.
WARNING
Improper installation, adjustment, alteration, service, or main
-
tenance can cause property damage, personal injury, or loss of
life. Refer to the User’s Information Manual provided with this
unit for more details.
WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal injury,
death and/or equipment damage.
R-410A refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on R-410A refrigerant equipment.
WeatherMaker
®
48A020-060
Single Package Gas Heating/Electric Cooling
Rooftop Units with
Comfort
Link Controls
and Puron
®
Refrigerant (R-410A)
