Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500271-01
Printed in U.S.A.
Form 50A-18SI
Pg 1
11-21
Replaces: 50A-17SI
Installation Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 — Provide Unit Support
. . . . . . . . . . . . . . . . . 3
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit
. . . . . . . . . . . . . . . . . . . 3
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork
. . . . . . . . . . . . . . 3
Step 4 — Make Unit Duct Connections
. . . . . . . . . . . 3
• 50A2,A3,A6,A7 UNITS
• 50A4,A5,A8,A9 UNITS
Step 5 — Trap Condensate Drain
. . . . . . . . . . . . . . 22
Step 6 — Make Electrical Connections
. . . . . . . . . . 22
• POWER WIRING
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 — Make Outdoor-Air Inlet Adjustments
. . . 26
• ECONOMIZER AND MIXED OUTDOOR AIR DAMPER
Step 8 — Position Power Exhaust/Barometric Relief
Damper Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
• VAV DUCT PRESSURE TRANSDUCER
• BUILDING PRESSURE TRANSDUCER
Step 10 — Install All Accessories/Options
. . . . . . . 30
• FIELD-FABRICATED WIND BAFFLES
Step 11 — Perform Field Modifications
. . . . . . . . . 32
• DUCTWORK
BACnet Communication Option Wiring . . . . . . . . . 32
• WIRING THE UPC OPEN CONTROLLER TO THE MS/
TP NETWORK
• MS/TP WIRING RECOMMENDATIONS
Using ZS Sensor or an Equipment Touch . . . . . . . 35
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
1. Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, personal injury,
or loss of life. Refer to the User’s Information Manual
provided with this unit for more details.
2. Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and goggles
and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from system
using both high-pressure and low pressure ports.
c. Traces of vapor should be displaced with nitrogen and
the work area should be well ventilated. Refrigerant in
contact with an open flame produces toxic gases.
d. Cut component connection tubing with tubing cutter and
remove component from unit. Use a pan to catch any oil
that may come out of the lines and as a gage for how
much oil to add to the system.
e. Carefully un-sweat remaining tubing stubs when neces
-
sary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal inju
-
ry or death.
WeatherMaker
®
50A020-060
Single Package Electric Cooling Rooftop Units
with Electric Heat Option,
Comfort
Link Controls
and Puron
®
Refrigerant (R-410A)
