Carrier 50QQ - Manual (Page 9)

COOLING STRAINERS HEATING COOLING STRAINERS HEATING
©
INDOOR
FAN
COOLING CYCLE
A87291
Fig. 10—Refrigerant Flow Diagrams
Table 5—Service Data
MODEL 50QQ 018 024 030 036 042 048 060
R-22 CHARGE* (lb) 7 lbs 4 oz 6 lbs 8 oz 8 lbs 0 oz 7 lbs 4 oz 8 lbs 12 oz 9 lbs 0 oz 9 lbs 0 oz
Piston Htg/cig. 52/42 61/49 67/32 76/63 78/70 82/73 93/84
INDOOR FAN Centrifugal—Direct Drive
Rpm 840 840 1100 1100
Diameter (in.) 10 12
Width (in.) 6 6
Range (cfm) 525-750 700-1000 875-1250 1020-1450 1170-1670 1340-1920 1690-2420
Motor Hp Va Va 'h % V 2 72 %
OUTDOOR FAN Propeller—Direct Drive
Cfm 2200 2200 2200 2700 3200 3200 3400
Rpm 840 840 840 1100 1100 1100 1100
Diameter (in.) 22 22 22 22 22 22 22
Motor Hp % Vs 74 74 74 V 2
•'Factory refrigerant charge
A WARNING
To prevent personal injury, wear safety glasses and
gloves when handling refrigerant.
Do not overcharge system. An overcharge can cause
compressor flooding.
Unit refrigerant system is factory charged. When recharg­
ing is necessary, weigh in total charge indicated in Table 5.
(Charge must be weighed in during heating season.) Remove
any refrigerant remaining in system before recharging. If
system has lost complete charge, evacuate system to 5000
microns (29.7-in. vacuum) before recharging. Schrader fit­
ting connections are provided on unit suction and discharge
lines for evacuation and charging. (See Fig. 12 for Schrader
fitting location.) Volumetric charging device is an accurate
device used to recharge systems by weight. These cylinders
are available at refrigeration supply firms.
CHARGING AND ADJUSTING REFRIGERANT
CHARGE
NOTE:
Check refrigerant charge in cooling mode when out­
door temperature is above 65 F. Check charge in heating
mode when temperature is below 65 F. If charge must be
checked in opposite mode, do not operate unit continually
for more them 10 minutes or damage to compressor may
result.
Refrigerant system is fully charged with R-22 refrigerant,
tested, and factory sealed. For more applications, factory
cheu-ge is the correct Eimount for best performance; however,
this charge may require a slight adjustment to atteun rated
performance.
NOTE:
Adjustment of refrigeremt cheu-ge is not required
unless unit is suspected of not having proper R-22 charge.
A CAUTION
When evaluating refrigerant charge, an indicated
adjustment to specified factory charge must always be
very minimal. If a substantial adjustment is indicated,
an abnormal condition exists somewhere in system,
such as insufficient airflow across either or both coils.
Heating Mode
1. Remove gage port caps from both service valves and
attach gage manifold. Use hoses with valve core
depressors.