Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional HVAC
installer or equivalent, service agency, or the gas
supplier
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
Table of Contents
Options / Accessories . . . . . . . . . . . . . . . . . . . . . Page 2
Blower Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
I-Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 14
II-Placement and Installation . . . . . . . . . . . . . . . Page 27
III-Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
IV-System Service Checks. . . . . . . . . . . . . . . . . . . . Page 30
V-Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 33
VI-Accessories . . . . . . . . . . . . . . . . . . . . . . .Page 34
VII-Wiring and Operation Sequence . . . . . . . . . . Page 39
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
maintenance), 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 parts.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
The LDT commercial combination heat pump and gas
-
-
frigerant systems utilize two compressors, two reversing
common to a heat pump. Units are available in 130,000,
inputs. Gas heat sections are designed with stainless
steel tube heat exchangers.
-
rect drive blowers. These units will provide supply air at
lower speeds when cooling demand is low and increase
to higher speeds when cooling demand is high. Refer to
Supply Air Start-Up sections.
energy management thermostat control systems with min-
Information contained in this manual is intended for use
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching
four cables to the holes located in the unit base rail (two
for the proper rigging technique.
LDT
6.5 / 7.5 / 8.5 / 10 / 12.5
100086
LDT DUAL FUEL SERIES
To Next Page
Need help?
General
