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SPLIT SYSTEM HEAT PUMP INDOOR UNIT
(Air-Handling Unit)
HVAC GUIDE SPECIFICATIONS— Section 15859
SIZE RANGE: 3,000 Cfm, Nominal Airflow
7
1
⁄
Tons, Nominal Cooling
2
MODEL NUMBER: PF1B
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
A. Indoor, packaged air-handling unit for use in commercial
heat pump split systems. Unit shall have a multi-position
design and shall be capable of horizontal or vertical instal-
lation on a floor or in a ceiling, with or without ductwork.
(Only vertical units are to be applied without ductwork.)
Unit shall function as the indoor component of an air-to-air
electric heat pump system.
B. Unit shall be used in a refrigerant circuit with a matching
air-cooled condensing unit, section 15678, for matched
system approved by manufacturer.
1.02 QUALITY ASSURANCE
A. All coils shall be designed and tested in accordance with
ASHRAE 15 Safety Code for Mechanical Refrigeration,
latest edition.
B. Unit shall be constructed in accordance with ETL and
ETL, Canada standards and shall carry the ETL and ETL,
Canada labels.
C. Unit insulation and adhesive shall comply with NFPA-90A
requirements for flame spread and smoke generation. In-
sulation shall contain an EPA-registered immobilized an-
timicrobial agent to effectively resist the growth of
bacteria and fungi as proven by tests in accordance with
ASTM standards G21 and 22.
D. Unit shall be manufactured in a facility registered to the
ISO 9002 manufacturing quality standard.
E. Direct-expansion coils shall be burst tested at 435 psi and
leak tested at 150 psi.
1.03 DELIVERY AND STORAGE
Units shall be stored and handled per manufacturer's
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT
Indoor mounted, draw-thru, packaged air-handling unit
that can be used with or without ductwork in a suspended
horizontal configuration or free-standing vertical configu-
ration. Unit shall be indoor component of a heat pump sys-
tem. Unit shall consist of forward-curved belt-driven
centrifugal fan, motor and drive assembly, prewired fan
motor contactor, factory-installed refrigerant metering de-
vice, bypass check valve, cooling coil, 2-in. disposable air
filters, and condensate drain pans for vertical or horizontal
configurations.
A. Base Unit:
1. Cabinet shall be constructed of mill-galvanized steel.
2. Cabinet panels shall be fully insulated with
retardant material. Insulation shall contain an EPA-
registered
immobilized
effectively resist the growth of bacteria and fungi as
proven by tests in accordance with ASTM stand-
ards G21 and 22.
GUIDE SPECIFICATIONS — INDOOR UNIT
⁄
-in. fire-
1
2
antimicrobial
agent
to
3. Unit shall contain PVC condensate drain pans for both
vertical and horizontal applications. Drain pans shall
have connections on right and left sides of unit to fa-
cilitate field connection. Drain pans shall have the abil-
ity to be sloped toward the right or left side of the unit
to prevent standing water from accumulating in pans.
4. Unit shall have factory-supplied 2-in. throwaway-type
filters installed upstream from the cooling coil. Filter
access shall be from either the right or left side of the
unit.
B. Coils:
1. Coils shall consist of 3 rows of copper tubes with sine-
wave aluminum fins bonded to the tubes by mechani-
cal expansion. Coil tubing shall be internally rifled to
maximize heat transfer. Refrigerant line connections
shall be made on the same side of the coil.
2. Coils shall feature factory-installed thermostatic ex-
pansion valve (TXV) for refrigerant control. The TXV
shall be capable of external adjustment.
3. Coils shall have a factory-installed bypass line and
check valve assembly around the TXV to allow liquid
flow from the coil to the outdoor unit during the heating
mode.
C. Operating Characteristics:
Unit shall be capable of providing
an external static pressure of
D. Motor:
Fan motor of the size and electrical characteristics speci-
fied on the equipment schedule shall be factory supplied
and installed.
E. Field-Installed Accessories:
1. Hot Water Coil:
Coil shall be 2-row, U-bend coil with copper tubes and
aluminum plate fins bonded to the tubes by mechani-
cal expansion. Coil shall be mounted in a galvanized
steel housing that shall be fastened to the unit's fan
deck for blow-thru heating operation. Coil shall have
maximum working pressure of 150 psig.
2. Steam Distributing Coil:
Coil shall consist of one row of copper tubes with alu-
minum plate fins, and shall have inner steam distrib-
uting tubes. Coil shall be mounted in a galvanized
steel housing and shall be fastened to the unit's fan
deck for blow-thru heating operation. Coil shall have
maximum working pressure of 175 psig at 400 F.
3. Electric Heaters:
Heaters for nominal 240 or 480 3-phase, 60 Hz power
supply shall be factory-supplied for field installation as
shown on the equipment drawings. Electric heat as-
sembly shall be ETL and ETL, Canada agency ap-
proved, and shall have single-point power wiring.
Heater assembly shall include contactors with 24-v
coils, power wiring, 24-v control wiring terminal blocks,
and a hinged access panel.
4. Air Discharge Plenum:
Plenum shall be factory supplied to provide free-blow
air distribution for vertical floor-mounted units. A grille
with moveable vanes for horizontal or vertical airflow
adjustment shall be included. Plenum housing shall be
field-installed on the unit's fan deck for blow-thru air
distribution.
24
cfm airflow at
in wg.
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