2
An electronic ICM fan motor provides
multispeed operation and enhanced
low-speed efficiencies and sound
levels.
Auto-reset high- and low-pressure
switches continuously monitor system
operation.
Mechanical and electrical interlocks
between the low- and high-speed
contactors eliminate the potential of
compressor motor burnout due to
contactor malfunction.
A compressor crankcase heater,
energized at the proper temperature
during the compressor off cycle, helps
to provide reliable starting.
Application Versatility
— The
38YDA can be combined with a wide
variety of evaporator coils, fan coils,
and furnaces to provide quiet,
dependable comfort. Unit can be
installed on a roof or at ground level on
a slab.
External Service Valves
— Both
service valves are brass, back seating
type with sweat connections. Valves
are externally located so refrigerant
connections can be made quickly and
easily. Each valve has a service port for
ease of checking operating refrigerant
pressures.
Easy Serviceability
— Removal of
access panel and control box cover
provides easy access to all electrical
controls and compressor. Removal of top
provides access to fan motor and coil.
A self-diagnostic indicator on the
electronic control board informs the
service technician of the problem area.
Compressor Protection
— Each
compressor is protected with internal
PTC-type overloads. An internal
pressure relief valve provides high-
pressure protection to the refrigerant
system.
Standard Features
— An electronic
control eliminates excessive wiring,
and features selectable second-stage
latching, TimeGuard II® short cycle
protection, a malfunction output signal
to the indoor thermostat, built in
Optimizer II®, zoning interface, and
outdoor thermostat for auxiliary heat
staging.
A compressor sound hood and
discharge muffler provide improved
sound power levels as well as sound
quality.
Compressor Quick Start
—
Capacitor and relay.
Thermostatic Expansion Valve
—
This unit must be installed with a TXV
on the indoor coil. The FK4 and FC4
indoor fan coils come factory equipped
with a bi-flow TXV. When installed in
this application, no further change is
required. If any other indoor fan coil or
furnace coil is used, an accessory
bi-flow TXV must be installed. See
accessory list in this publication for
correct part number. TXV is not
shipped with unit.
Limited Warranty
— One-year
limited warranty on all parts with an
extended second-year warranty on the
control board and extended second-
through tenth-year limited warranty on
the compressor. Refer to warranty
certificate for specific details.
Model number nomenclature
38YDA
036
Electric Heat Pump
Nominal Capacity
036 — 36,000 Btuh
048 — 48,000 Btuh
060 — 60,000 Btuh
3
0
1
Packaging
Series
Electrical
3 — 208/230-1
M
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RT
IFIED
TO ARI
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IN
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STANDARD
24
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EQUIPMENT
®
CERTIFICATION OF MANUFACTURING SITE.
CERTIFICATION APPLIES ONLY
WHEN THE COMPLETE SYSTEM
IS LISTED WITH ARI.
As an ENERGY STAR
SM
Partner, Carrier Corporation
has determined that this
product meets the ENERGY
STAR guidelines for energy
efficiency.
