©2019
SGH120 SHOWN
IMPORTANT
Supply air VFD motor rotation is controlled indepen
dently from scroll compressor rotation. See Cooling
Start-Up section for correct compressor rotation.
Compressor damage due to improper rotation is the
responsibility of the installer.
Table of Contents
Dimensions Page 2.................................
Parts Arrangements Page 5.........................
Shipping and Packing List Page 8....................
General Page 8....................................
Safety Page 8.....................................
Unit Support Page 9................................
Duct Connection Page 10............................
Rigging Unit For Lifting Page 10.......................
Condensate Drains Page 10..........................
Gas Piping Page 11.................................
Pressure Test Gas Piping Page 11.....................
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
SGH/SCH036 (3 TON)
SGH/SCH060 (5 TON)
SGH/SCH120 (10 TON)
SGH/SCH240 (20 TON)
ROOFTOP UNITS
507964-01
9/2019
Supersedes 507364-02
High Altitude Derate Page 12.........................
Optional Outdoor Air Hood Page 13....................
Electrical Connections Page 15.......................
Blower Operation and Adjustments Page 17............
Cooling Start-Up Page 29............................
Cooling Operation and Adjustments Page 31............
Gas Heat Start-Up Page 41...........................
Electric Heat Start-Up Page 43........................
Heating Operation and Adjustments Page 43............
MSAV
t Unit Start-Up Page 45........................
MSAV
t Operation Page 46..........................
Direct Drive Start-Up Page 47.........................
Hot Gas Reheat Startup Page 49......................
Economizer Start-Up Page 53.........................
Service Page 55....................................
Factory Control Parameter Settings Page 58............
Start-Up Report Page 60.............................
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in
staller or equivalent, service agency, or the gas sup
plier
WHAT TO DO IF YOU SMELL GAS:
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
WARNING
Do not store or use gasoline or
other flammable vapors and liq
uids in the vicinity of this or any
other appliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
S Do not try to light any appliance.
S Extinguish any open flame.
S Do not touch any electrical switch; do not
use any phone in your building.
S Immediately call your gas supplier from a
neighbor's phone. Follow the gas suppli
er's instructions.
S If you cannot reach your gas supplier, call
the fire department.
S Leave the building immediately.
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