2022
WARNING
To prevent serious injury or death:
1- Lock-out/tag-out before performing maintenance.
2- If system power is required (e.g., smoke detector mainte
nance), disable power to blower, remove fan belt where
applicable, and ensure all controllers and thermostats are
set to the “OFF” position before
performing maintenance.
3- Always keep hands, hair, clothing, jewelry, tools, etc.,
away from moving part
s.
Table Of Contents
Dimensions Page 2.................................
Parts Arrangements Page 4.........................
Shipping and Packing List Page 5....................
General Page 5....................................
Safety Page 5.....................................
Unit Support Page 6................................
Duct Connection Page 7............................
Rigging Unit For Lifting Page 7.......................
Condensate Drains Page 7..........................
Gas Piping Page 9.................................
Pressure Test Gas Piping Page 10.....................
High Altitude Derate Page 11.........................
Download Mobile Service App Page 11.................
Electrical Connections - Power Supply Page 12.........
Electrical Connections - Control Wiring Page 12.........
Blower Operation and Adjustments Page 14............
Direct Drive Start-Up Page 16.........................
Cooling Start-Up Page 19............................
Prognostic & Diagnostic Sensors Page 21..............
INSTALLATION
INSTRUCTIONS
LHT/LDT078H
LHT/LDT092H
LHT/LDT102H
LHT/LDT122H
LHT/LDT150H
(6.5 Ton)
(7.5 Ton)
(8.5 Ton)
(10 Ton)
(12.5 Ton)
PACKAGED UNITS
508320-01
10/2022
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser
vice must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier
Gas Heat Start-Up Page 24...........................
Heating Operation and Adjustments Page 26............
Electric Heat Start-Up Page 26........................
Cooling Operation Page 27...........................
Service Page 28....................................
Field-Installed Accessories Page 35...................
Unit Controller Parameter Settings Page 35.............
Use this QR code to download the mobile service app. Follow the prompts
to pair the app with the unit control system and configure the unit. Refer to the
“Download Mobile App” section in this manual and the Setup Guide provided
with this unit. The QR code is also available in the unit control area.
The app can be downloaded from the appropriate iOS or Android store.
Look for the following icon.
Attention!
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