SPB − 3 to 5 Ton R−410A Heat Pump
Outdoor Units
FEATURES
COMPRESSOR (CONTINUED)
Crankcase Heater
Crankcase heater prevents migration of liquid refrigerant
into compressor and ensures proper compressor
lubrication.
Outdoor Thermostat Kit
An outdoor thermostat can be used to lock out some of the
electric heating elements on indoor units where two−stage
control is applicable.
Outdoor thermostat maintains the heating load on the low
power input as long as possible before allowing the full
power load to come on the line.
Thermostat kit and mounting box must be ordered extra.
Cabinet
Heavy−gauge steel construction
Pre−painted cabinet finish.
Pre−painted base section.
Compressor and control box located in a separate
compartment, insulated with thick fiberglass insulation.
Compartment provides protection from the weather and
keeps sound transmission at a minimum.
Control box is conveniently located with all controls
factory wired.
Large removable panel provides service access.
Drainage holes are provided in base section for moisture
removal.
High density polyethylene unit support feet raise the unit off
of the mounting surface, away from damaging moisture.
SmartHinge
t
Louvered Coil Protection
Steel louvered panels
provides complete coil
protection.
Panels are hinged to
allow easy cleaning
and servicing of coils.
Panels may be
completely removed.
Interlocking tabs and
slots assure tight fit on
cabinet.
Refrigerant Line Connections, Electrical Inlets and
Service Valves
Vapor and liquid lines are located on corner of unit cabinet
and are made with sweat connections. See dimension
drawing.
Fully serviceable brass service valves prevent corrosion
and provide access to refrigerant system. Vapor valve can
be fully shut off, while liquid valve may be front seated to
manage refrigerant charge while servicing system.
Vapor and liquid line service valves and gauge ports are
located inside the cabinet.
Refrigerant line connections and field wiring inlets are
located in one central area of the cabinet. See dimension
drawing.
CONTROLS
Defrost Control
Solid-state control furnished as standard.
Gives a demand defrost cycle whenever system heating
performance falls below optimum levels. The sensing
element on coil determines when defrost cycle is required
and when to terminate cycle.
Anti−short cycle (5 minutes) incorporated into the board.
Diagnostic LED’s furnished as an aid in troubleshooting.
Conveniently located in control box.
OPTIONS
Indoor Blower Speed Relay Kit
Relay kit provides optimum humidity control conditions by
automatically reducing indoor blower speed during
continuous fan or first−stage compressor operation.
L Connection
®
Network
Complete building automation control system for single or
multi−zone applications. Options include local interface,
software for local or remote communication, and
hardware for networking other control functions. See L
Connection Network Engineering Handbook Bulletin for
details.
Low Ambient Control Options
Air conditioners operate satisfactorily down to 45°F
outdoor air temperature without any additional controls.
Two low ambient control options are available for field
installation:
Low Ambient Control Kit (30°F)
Allows unit operation down to 30°F. See Optional
Accessories, page 7, for ordering information.
Low Ambient Control Kit (0°F)
Allows unit operation down to 0°F. This option requires
that the outdoor fan motor and capacitor be changed. See
Low Ambient Control Option table, page 7, for ordering
information.
A Freezestat should be installed on compressors
equipped with a low ambient kit.
A Compressor Low Ambient Cut−off should be added to
terminate compressor operation below recommended
operation conditions (on/off operation, 30°F or modulating
operation, 0°F).
Indoor Blower Off Delay Relay
Delays the indoor blower−off time during the cooling cycle.
See ARI Rating Tables for usage.
Monitor Kit − Service Light
Contains ambient compensating thermistor and service
light thermostat.
For use with thermostats requiring input for indicator
lights.
J
K
L
M
