TECHNICAL GUIDE
AFFINITY
SPLIT-SYSTEM HEAT PUMPS
13 SEER – R-22
MODELS: YMB018 THRU 060
(1.5 THRU 5 NOMINAL TONS)
Due to continuous product improvement, specifications
are subject to change without notice.
Visit us on the web at www.york.com for the most
up-to-date technical information.
Additional rating information can be found at
www.ariprimenet.org.
LISTED
ISO 9001
Certified Quality
Management System
246809-YTG-E-0507
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
DESCRIPTION
The YMB Series unit is the outdoor part of a versatile heat
pump system. It is designed to be custom matched with one
of our complete line of evaporator sections, each designed to
serve a specific function. Matching air handlers are available
for upflow, downflow, and horizontal left or right application to
provide a complete system. Electric heaters are available if
required. Add-on coils are available for use with upflow,
downflow, or horizontal furnaces. Field installed accessories
are available as needed.
WARRANTY
5-year limited parts warranty.
10-year limited compressor warranty.
FEATURES
• Superior Coil Protection – A stamped decorative metal
coil guard completely protects coil from debris and other
large damaging material while a polymer mesh further pro-
tects the coil against smaller particles.
• Isolated Compressor Compartment – A molded com-
posite bulkhead isolates the compressor from the rest of
the unit reducing sound and vibration.
• Protected Compressors – Each compressor is protected
against high and low pressure as well as excessive tem-
perature. This is accomplished by by the simultaneous
operation of a high pressure relief valve and temperature
sensors which protect the compressor if undesirable con-
ditions occur.
• Durable Finish – Automotive quality finish provides the
ultimate protection from harmful U.V. rays as well as rust
creep ensuring long-lasting high quality appearance. A
powder-paint topcoat is applied over a baked-on primer,
using a galvanized, zinc coated steel base material. The
result is a finish that has been proven in testing to provide
33% greater durability than conventional powder-coat fin-
ishes.
• Lower Installed Cost – Designed to provide enhanced
installability by featuring a slide-down control compartment
allowing easy access to control components along with
angled service valves to reduce overall installation time
and cost.
• Low Operating Sound Levels – A fan design boasting
technology adapted from aeronautic and defense engi-
neering provides for whisper quiet operation by allowing
airflow to flow smoothly and efficiently across the fan tips.
• Filter-Drier – A factory installed, solid core liquid line filter-
drier filters harmful debris and moisture from the system.
• Easy Service Access – A full end, full service, access
panel with handle makes for easy entry to internal compo-
nents.
• Long Lasting Operation – Strong and durable composite
base pan provides added strength while resisting rust and
corrosion as well as reducing sound and vibration.
• Complete System Control – These heat pumps utilize
the unique microprocessor defrost control system to pro-
vide optimal comfort as well as monitor the overall system
for reliable operation. The defrost control system continu-
ously monitors the space environment to maintain opti-
mum efficiency. It initiates defrost only when necessary to
further reduced heating costs and improve reliability. Sup-
plemental heat can only operate below the balance point
and then only upon need. In the event improper operating
conditions occur (high temperature and/or high pressure),
the will automatically shut the system down to extend the
life of the heat pump. Rapid cycling is prevented by use of
an internal anti-recycle timer. The defrost control features
an internal memory to aid the technician in troubleshoot-
ing, reducing service time and cost.
Certified in accordance with the Unitary Small Equipment cer-
tification program, which is based on ARI Standard 210/240.
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