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LHT/LDT024, 036, 048, 060
Shipping and Packing List
Package 1 of 1 contains:
1- Assembled unit
Check unit for shipping damage. Receiving party should
contact last carrier immediately if shipping damage is found.
General
These instructions are intended as a general guide
and do not supersede local codes in any way.
Authorities having jurisdiction should be consulted
before installation.
The LDT heat pump/gas heating (duel-fuel) packaged
rooftop unit is available in 65,000, 108,000, or 150,000
Btuh heating inputs. The LHT heat pump packaged
rooftop unit is the same basic design as the LDT unit
except for the heating section. Optional electric heat is
factory- or field-installed in LHT units.
The LHT/LDT units have 2, 3, 4, and 5-ton cooling
capacities.
Units are equipped with fin/tube condenser coils, two speed
compressors, and variable speed, direct drive blowers.
Compressor and supply air speeds adjust to system
demand.
Availability of units and options varies by brand.
Requirements
See figure 1 for unit clearances.
The LDT unit is ETL/CSA certified for outdoor installations
only at the clearances to combustible materials listed on
unit nameplate and in figure 1.
The LHT unit is ETL/CSA certified as a heat pump with
cooling and with or without auxiliary electric heat for
outdoor installations only at the clearances to
combustible materials as listed on the unit nameplate and
in figure 1.
Installation of LHT/LDT units must conform with
standards in National Fire Protection Association
(NFPA) “Standard for Installation of Air Conditioning
and Ventilating Systems NFPA No. 90A,” “Standard for
Installation of Residence Type Warm Air Heating and
Air conditioning Systems NFPA No. 90B,” local
municipal building codes and manufacturer's
installation instructions.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent
ing of refrigerant (CFC's and HCFC's) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incar
ceration may be levied for non-compliance.
WARNING
Electric shock hazard and danger of
explosion. Can cause injury, death or
product or property damage. Turn off
gas and electrical power to unit before
performing any maintenance or
servicing operations on the unit. Follow
lighting instructions attached to unit
when putting unit back into operation
and after service or maintenance.
NOTICE
Roof Damage!
This system contains both refrigerant and oil.
Some rubber roofing material may absorb oil,
causing the rubber to swell. Bubbles in the rubber
roofing material can cause leaks. Protect the roof
surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow
this notice could result in damage to roof surface.
UNIT CLEARANCES
C
D
B
A
FIGURE 1
1Unit
Clearance
A
in.(mm)
B
in.(mm)
C
in.(mm)
D
in.(mm)
Top
Clearance
Service
Clearance
48
(1219)
36
(914)
36
(914)
36
(914)
Unob
structed
Clearance to
Combustibles
36
(914)
1
(25)
1
(25)
1
(25)
Unob
structed
Minimum Opera
tion Clearance
36
(914)
36
(914)
36
(914)
36
(914)
Unob
structed
Note - Entire perimeter of unit base requires support when elevated above
mounting surface.
1
Service Clearance
- Required for removal of serviceable parts.
Clearance to Combustibles
- Required clearance to combustible material
(gas units). On LHT units, see clearance to combustible materials as
outlined on heater rating plate.
Minimum Operation Clearance
- Required clearance for proper unit operation.
