Carrier Packaged Terminal s & Heat Pumps 52P - Manual (Page 52)

52
axial flow design, with integrated slinger ring. The
indoor fan shall be a dynamically balanced, poly-
mer, reverse curve blower wheel, to assure uniform
air distribution. The fan motor shall be of an
enclosed design to reduce the effects of moisture
and corrosion.
D. Compressor and Refrigerant:
The rotary-type compressor shall be fully hermetic
with internal and external vibration isolation. The
refrigeration system will be sealed and contain a
full refrigerant charge (R-22).
E. Coils:
Condenser and evaporator coils to be constructed of
high-efficiency, 11-element lance sine wave
enhanced aluminum fins and 3 /
8
-in. seamless axial
grooved copper tubing, necessary to achieve
EER and COP rating, as specified on the chassis
nameplate.
F. Factory-Installed Electric Heater:
The factory-installed, open coil type, electric heater
is standard in heat/cool and heat pump chassis. The
electric heater shall contain both an automatic reset
and a one-shot overtemperature protection device.
The heating capacity of the electric heater shall be
as identified on the contract drawing schedule and
in the specifications.
G. Controls:
All standard models shall be equipped with electro-
mechanical controls to simplify the serviceability of
the unit.
1. The chassis shall have standard controls,
accessible and covered by a hinged door. The
mode selection control shall consist of a
mechanical rotary selector switch, which pro-
vides OFF, FAN ONLY, HEAT or COOL oper-
ations. The temperature selection control shall
be an adjustable thermostat with upper and
lower limits.
2. All standard models shall have a continuous/
fan cycle selector switch located behind the
front panel. It shall allow the selection of con-
tinuous fan operation for maximum comfort or
cycle operation (fan only runs with cooling
or heating operation) for maximum energy
savings.
3. All standard models shall have a temperature
limiter control located behind the front panel.
The temperature limiter allows a room temper-
ature range to be set, to avoid extreme temper-
ature settings, to maximize energy savings.
4. Emergency Heat switch (heat pump models
only) shall disable the compressor in heating
mode and only allow the use of electric
heat during heating cycles. The Emergency
Heat switch is active at all outdoor ambient
temperatures.
5. Wall thermostat chassis (RC and RP models)
shall come from the factory ready for wall
thermostat installation, including a blank out
plate in place of the control knobs. No field-
installed kits or wire harnesses shall be
required.
6. Wall thermostat chassis (RC and RP models)
shall have a user selectable fan speed control
switch, on the control panel, to optimize fan
speed for maximum comfort.
H. Safeties:
Compressor shall have automatic reset, overtem-
perature and overcurrent protection. The fan motor
shall have an inherent, automatic reset overtemper-
ature protection. The electric heater shall have two
overtemperature protectors.
I. Front Panel (supplied with chassis):
Front panel shall be constructed of a polymer mate-
rial to resist breakage and corrosion. It shall have a
front louvered surface with integrated control
door and air filters. The air filters shall be easily
accessible without removing the front panel from
the chassis.
J. Anti-Theft Control Knobs:
All chassis knobs shall resist breakage and corro-
sion. They shall be mounted on to the control box
section and captured behind the front panel, to pre-
vent unauthorized removal.
K. Bi-Directional Discharge Grille:
Bi-directional polymer discharge grille shall resist
corrosion and breakage. It shall be easily set to
direct air at 40 degrees from horizontal or
80 degrees from horizontal. This non-metallic dis-
charge grille shall be cool to the touch during the
heating cycle.
L. Ventilation:
The chassis shall have a manual adjustable fresh air
vent with a concealed manual control. The vent
control shall allow a maximum of 50 cfm of fresh
air to be drawn into the room when the indoor fan is
operating and the door is open. The ventilation air
can be increased to approximately 95 cfm by add-
ing the Power Fresh Air Vent accessory kit (see
section Q.17).
M. High-Efficiency Condensate Removal System:
The chassis shall have a condensate removal sys-
tem consisting of a condensate suction port, to draw
and atomize condensate, and a slinger ring inte-
grated in the outdoor fan, to disperse condensate
onto the condenser coil to be evaporated.
N. Snow Baffle:
The chassis shall contain a snow baffle to prevent
melting snow from freezing and potentially damag-
ing the outdoor fan.
O. Corrosion Protection (CP and RP Models Only):
Chassis with Corrosion Protection (CP,RP) shall be
used for coastal or corrosive environments, to pro-
long the life of the product. Minimum requirements
are:
1. All outdoor-exposed sheet metal parts shall be
coated with a polyester powder coat paint.
2. Compressor and outdoor-fan motor finish shall
be capable of withstanding 500 hours of salt
spray testing per ASTM B-117.
3. Compressor mounting screws shall be
SermaGuard™ coated.
4. Outdoor coil fin stock shall be coated and able
to withstand 1000 hours of salt spray testing
per ASTM B-117.
5. Outdoor coil tube sheets shall be made of 316L
stainless steel.
GUIDE SPECIFICATIONS (cont)