Carrier 50YQ - Manual (Page 8)

Table 4 — Service Data
UNIT 50YQ 024 030 036 042 048 060
R-22 CHARGE* (lb) 54 5 7 5 15 6 7 7 3 8 6
Refrig Control AccuRater^M
INDOOR FAN Centrifugal — Direct Drive — 3-Speed
Rpm 1100/1050/900
Diameter (in.) 9 9 9 10 10 10
Width (in.) 7 7 9 9 9 10
Range (cfm) 833-1040 1000-1250 1183-1480 1367-1708 1633-2040 1800-2250
Motor Hp 1/5 1/5 1/3 1/2 1/2 3/4
OUTDOOR FAN Propeller — Direct Drive
Cfm 2500 2500 2500 2700 3200 3600
Rpm 1050 1050 1050 1050 1050 1050
Diameter (in.) 20 20 20 20 20 20
Motor Hp 1/5 1/5 1/4 1/4 1/4 1/4
"Factory refrigerant charge
Unit refrigerant system is factory charged. When
recharging is necessary, weigh in total charge indi­
cated in Table 4. (Charge must be weighed in during
heating season.) Remove any refrigerant remaining
in system before recharging. If system has lost com­
plete charge, evacuate system to 500 microns
(29.7 in. vacuum) before recharging. Service port
connections are provided on unit suction and dis­
charge lines for evacuation and charging. (See
Fig. 10 for service port location.) Dial-a-charge
charging cylinder is an accurate device used to re­
charge systems by weight. These eylinders are avail­
able at refrigeration supply firms.
OUTDOOR FAN
DISCHARGE GRILL
CONTROL WIRING
TERMINAL BLOCK
TOP COVER
UNIT CONTROL
BOX
REVERSING
VALVE
\
INDOOR INDOOR BLOWER
COIL MOTOR I
CONTROL WIRING
CONDUIT
SUCTION LINE'
SCHRADER
FITTING
COMPRESSOR
HOLD DOWN
BOLTS
ELECTRIC
COMPRESSOR a I s EMBLY
CONDENSATE \
DRAIN LINE LINEWIRING
SPLICE BOX
Fig. 10 — Component Location (Typical)
To check and/or adjust charge during cooling
season, use correct Cooling Cycle Charging Chart
(Fig. 11 thru 16) and follow Charging Chart Method
below. The charging chart may also be used as an
alternate method of recharging system.
To check system operation during heating cycle,
use correct Heating Cycle Operation Check Chart
(Fig. 17 thru 22). These charts indicate whether a
correct relationship exists between system operating
pressures and air temperatures entering unit. If
pressure and temperature lines do not intersect on
chart, the system refrigerant charge may not be cor­
rect or other sysem abnormalities may exist. Do not
use Operation Check Charts to adjust refrigerant
charge. Weigh charge into system.
COOLING CYCLE CHARGING CHART
METHOD
1. Operate unit a minimum of 10 minutes before
checking charge, and after each charge
adjustment.
2. Measure suction pressure by attaching a gage to
unit suction service port. (See Fig. 10 for correct
service port location.)
3. Measure outdoor (coil inlet) air dry-bulb tem­
perature. Use service thermometer.
4. Using a sling psychrometer, measure wet-bulb
temperature of air entering indoor fan coil.
5. Refer to correct Charging Chart. Locate on
curves where outdoor air dry-bulb and indoor
air wet-bulb temperature lines intersect.
6. From intersect point, project vertically down­
ward to chart suction pressure line. Compare
chart suction pressure to unit suction pressure
(Step 2).
7. If unit suction pressure is lower than ehart
pressure, add refrigerant to system until chart
pressure is reached. If unit suction pressure is
higher than chart pressure, remove refrigerant
until chart pressure is reached.
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