100083
LDT SERIES
Service Literature
13 to 20 ton
LDT156 through 240
The LDT156, 180 and 240 units are configure to order units
(CTO) with a wide selection of factory installed options.
The LDT156 is available in 169,000 to 360,000 Btuh. The
LDT180/240 is available in 169,000 to 480,000 Btuh..
Gas heat sections are designed with stainless steel tube
heat exchangers with stainless steel as an option.
Cooling capacities range from 13 to 20 tons. The LDT 156,
180 & 240 utilize two compressors and six condenser fans.
Multi-Stage Air Volume MSAV
®
blower option is available.
The VFD-driven blower will operate at lower speeds when
demand is low and increase to higher speeds when
demand is high.
All LDT units are designed to accept any of several different
energy management thermostat control systems with
minimum field wiring. Factory- or field-provided control
options connect to the unit through Smartwiret
connectors. When "plugged in" the controls become an
integral part of the unit wiring.
The CORE Control System is designed to accelerate
equipment install and service. Standard with all Enlight
rooftop units, control system integrates key technologies
that lower installation costs, drive system efficiency, and
protect your investments.
The CORE Unit Controller is a microprocessor-based
controller that provides flexible control of all unit functions.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not
supersede 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 holes at
each corner). Refer to the installation instructions for the
proper rigging technique.
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 qualified installer or service
agency.
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 per
forming maintenance.
3- Always keep hands, hair, clothing, jewelery, tools,
etc.,c away from moving parts.
Table of Contents
Options / Accessories Page 2.....................
Specifications Page 6............................
Gas Heat Specifications / High Altitude Page 7......
Blower Data Page 8.............................
Electrical Data Page 11...........................
Unit Parts Arrangement Page 13...................
I-Unit Components Page 13.......................
II-Placement and Installation Page 31...............
III-Charging Page 31..............................
IV Start Up - Operation Page 32....................
V-System Service Checks Page 34.................
VI-Maintenance Page 36.........................
VII-Accessories Page 37..........................
VIII-Staged Blower Page 42.......................
IX-Wiring and Operation Sequence Page 45.........
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