Carrier 542E - Manual (Page 5)

REVERSING VALVE
ASSEMBLY
HIGH-PRESSURE
SERVICE FITTING
CAPACITOR(S)
(COMPRESSOR
a
FAN MOTOR)
BLOWER MOTOR
RELAY
LOW-PRESSURE
SERVICE FITTING
ACCUMULATOR
ACCUMULATOR
FUSIBLE
PLUG
DEFROST
THERMOSTAT
METERING
DEVICE
LOW-PRESSURE SWITCH
INDOOR COIL DRAIN PAN
BLOWER MOTOR
CAPACITOR
DEFROST
RELAY
DEFROST
TIMER
TRANSFORMER
LOW-VOLTAGE
TERMINAL
BOARD
LOW-VOLTAGE
INLET HOLE
CHASSIS
GROUND
CONNECTION
QUICK-START PTC
THERMISTOR
4 MPT PLASTIC DRAIN FITTING
^(SHIPPED TAPED INSIDE
COMPRESSOR COMPARTMENT)
COMPRESSOR
■HIGH-
VOLTAGE
PIGTAIL
LEADS
Figure 8—Partial Side'View With Compressor & Control
Access Panels Removed (Model 542E036, 208V-230V—1)
A79243
During the heating defrost cycle, defrost water from the
melting ice on the outdoor coil flows through the holes in the
heat pump base directly below the outdoor coil. When using
a field-supplied drain pan to catch the defrost water, be sure
that this pan is at least 2 inches high and extends at least 2
inches beyond the width and length of the unit.
If the installation requires draining the condensate and/or
defrost water away from the unit, connect a drain tube(s),
using a minimum of 7/8-inch OD copper tubing, 3/4-inch
galvanized pipe, or 7/8-inch plastic pipe. Do not undersize the
tuhe(s). Pitch the drain tube(s) downward at a slope of at
least 1 inch in every 10 feet of horizontal run. Be sure to
check the drain tube(s) for leaks.
Condensate and defrost water can be drained directly onto
the roof in rooftop installations (where permitted) or onto a
gravel apron in ground-level installations. When using a
gravel apron, make sure it slopes away from the unit.
III. DUCT CONNECTIONS
Model 542E has duct flanges on the supply- and return-air
openings on the side of the unit. See Figure 3 for connection
sizes and locations.
Model 542D has duct flanges on the supply- and return-air
openings on the bottom of the unit. See Figure 4 for connec­
tion sizes and locations.
WARNING: The design and installation of the duct system
must be in. accordance with the standards of the National
Fire Protection Association for installation of nonresidence-
type air conditioning and ventilating systems, NFPA No.
90; or residence-type, NFPA No. 90B; and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Select and size ductwork, supply-air registeis, and
return-air grilles according to ASHRAE recommenda­
tions and as presented in BDP training materials.
CAUTION: When the duct system fastening holes are being
drilled into the side of Model 542E instead of the unit duct
flanges, use extreme care to avoid puncturing the coil or coil
tubes.
2. Use a flexible transition between rigid ductwork and
unit to prevent transmission of vibration. The transi­
tion may be screwed or bolted to duct flanges. Use suita­
ble gaskets to ensure a weather and airtight seal.
NOTE: When using a supplemental electric heater, main­
tain a minimum clearance of one inch to combustible
materials for the first 36 inches of duct and use fireproof
material for the transition between the ductwork and unit
supply-air duct flange. When using flexible duct (which is
not heat resistant), use a 36-inch long sheet metal duct be­
tween the supply outlet and the flexible duct. Observe the
warning on the unit rating plate.
3. Install an external, field-supplied air filter(s) in the
return-air ductwork where it is easily accessible for ser­
vice. Recommended filter sizes are shown in Table I.
(Model 542D has factory-supplied air filters.)
4. Size all ductwork for required indoor airflow of heat
pump being installed. This airflow will be adequate for
safe electric heater operation (except when using 20-
KW heater with 030-size unit airflow must be at least
1000 fU/min). Avoid abrupt duct size increases or
decreases.
5. Adequately insulate and weatherproof all ductwork
located outdoors. Insulate ducts passing thru an uncon­
ditioned space, and use a vapor barrier in accordance
with the latest issue of SMACNA and NESCA minimum
installation standards for heating and air conditioning
systems. Secure all ducts to the building structure.
6. Flash, weatherproof, and vibration-isolate all openings
in building structure in accordance with local codes and
good building practices.