2023
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
Table of Contents
Dimensions Page 2.................................
Parts Arrangements Page 3.........................
Shipping and Packing List Page 4....................
General Page 4....................................
Unit Support Page 5................................
Duct Connection Page 6............................
Rigging Unit For Lifting Page 6.......................
Condensate Drains Page 7..........................
Gas Piping Page 8.................................
Pressure Test Gas Piping Page 8.....................
High Altitude Derate Page 9.........................
Download Mobile Service App Page 9.................
Electrical Connections - Power Supply Page 10.........
Electrical Connections - Control Wiring Page 10.........
Blower Operation and Adjustments Page 12............
Cooling Start-Up Page 18............................
INSTALLATION
INSTRUCTIONS
LHT/LDT156
LHT/LDT180
LHT/LDT240
(13 Ton)
(15 Ton)
(20 Ton)
HEAT PUMP AND DUAL-FUEL PACKAGED UNITS
508336-01
4/2023
Supersedes 1/2003
Gas Heat Start-Up (LDT) Page 21.....................
Heating Operation and Adjustments Page 22............
Heating Start-Up (LHT) Page 22.......................
Defrost Control Page 23..............................
Multi-Staged Air Volume Start-Up Page 24..............
Multi-Staged Air Volume Operation Page 26.............
Temperature Thermistor Sensors Page 27..............
Service Page 29....................................
Unit Controller Parameter Settings Page 34.............
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
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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