Carrier 38QF - Manual (Page 7)

MOUNT OUTDOOR THERMOSTAT on control
ring, to the left of the low-voltage control connec­
tion. See Fig. 1.
Attach brackets with short sheet metal screws to
avoid contact with coil. Leave capillary tube coiled
in control compartment making sure it is clear of all
electrical connections and sharp metal edges.
MOUNT SUPPLEMENTAL HEAT RELAY in
convenient location on indoor unit. Attach with
sheet metal screw.
To Start Unit — (Make sure crankcase heater
has been energized for 24 hours.) Adjust the thermo­
stat as follows:
1. Set selector switch at OFF.
2. Turn on main disconnect switch(es) to indoor
and outdoor units.
3. Set fan switch as desired (ON or AUTO.).
4. Set thermostat dial at desired temperature.
5. Set selector switch at HEAT or COOL.
Check system refrigerant charge. See Refrigerant
Charging.
When recharging is necessa^ during heating or
cooling season, weigh in total charge indicated in
Table 6. (Charge must be weighed in during heating
season.) Remove any refrigerant remaining in
system before recharging. If system has lost com­
plete charge, triple-evacuate system to 5000 microns
(29.7 in. vacuum) before recharging. Service port
connections are provided on liquid and suction line
service valves for evacuation and charging (See
Fig. 6 for correct service port location on cooling
and heating cycles.) Dial-a-charge charging cylinder
is an accurate device used to recharge systems by
weight. These cylinders are available at refrigeration
supply firms.
Table 6 — Service Data
UNIT38QF 018 024 030 036 042 048 060
R-22 CHARGE (lb) 5.7 6.1 6.7 7.4 8.7 9.3 9.8
REFRIG CONTROL
FAN
Cfm
Rpm
Diam (in.)
AccuRater™ (Bypass Type)
2400 2750
840
20
4500
26
SERVICE
C M ' l l O N : Unit has high-picssiire piping
whicli ma\ also be lu)t to touch, cncrgi/.ed elec­
trical components and a rotating fan. Before
ser\icing or checking unit, be sure all s\stem
power is off and tubing is cool.
( \l l l ( ) \ I I I p u \ . . i l pei'oiul in, ! i \ . weai
satety glasses and glcues when handling
Do not overeharge system. \n o\erchargeean
cause compressor flooding.
Refrigerant Charging — The 38QF units contain
correct operating charge for complete system when
connected to 28VQ, 40QB/ QH or 40AQ indoor
units with 25 ft of tubing of recommended diameter.
Charge adjustment is required on other systems.
Adjust system charge for refrigerant line lengths and
diameters that differ from 25 ft and 3/8 in. OD
(liquid line), respectively, using refrigerant weights
below. Twenty-five ft 3/8-in. OD tubing contains
14.4 oz of R-22. Add R-22 charge to system if liquid
line is over 25 ft; remove charge if liquid line is
shorter than 25 feet.
LIQUID LINE
DIAM (in.)
OUNCES OF R-22/FT LENGTH
OF LIQUID LINE
% .58
COOLING CYCLE
piÌBilÌÌlBSB«Eip0IipÌ*®Ì5!SEBÌ
AT SERVICE VALVE (CLG CYCLE) (BYPASSING)
SWITCH
Fig. 6 — 38QF Refrigerant Flow Diagrams