Carrier 38GC - Manual (Page 5)

START-UP INSTRUCTIONS
38GF Units — Crankcase heater should be ener­
gized a minimum of 4 hours before starting unit.
Start Procedure (38GC and 38GF)
1. Backseat (open) liquid and suction line service
valves.
CAUTiON: Seme? v's.tves have Teflon
wassher. Do not ovefíígJtteo (fhiget
seal)» Dei not exceed 10 fi4b torque
when íjghíenMg,
2. Close electrical disconnects energizing entire
system.
3. Set room thermostat to desired temperature.
4. Set room thermostat to “Cool” and fan switch
as desired (“Fan”) (“Auto”).
Motors and controls will operate satisfactorily
10% above and 10% below unit voltage (Table 5).
Do not connect charging hoses to capillary
controlled system during initial start procedure.
(Loss of charge from this procedure may result in
capacity reduction.) If necessary to add manifold
gages for servicing, refer to Carrier Standard
Service Techniques Manual, Chapter 1, pages 1-5,
Fig. 8, for bypass method of returning charge to
system.
COMPRESSOR
38GC101 and 38GC,GF102,103 Unit Single-Phase
Compressors
of the split capacitor (PSC) type
require an equalized system pressure to start. (See
Physical Data table for compressor type.)
When supply voltage is within 10% limit and
compressor does not start, give compressor a
temporary capacitance boost. See Carrier Standard
Service Techniques Manual, Chapter 2, for details.
Use a 130 mfd start capacitor. Run compressor for
10 minutes then shut off and allow system pressure
to equalize. Try restarting without boost capacitor.
If after two attempts (without boost capacitor) the
compressor does not start, add an accessory start
capacitor relay package.
Compressor Protection
38GF UNITS have a high pressurestat located on
liquid line and a low pressurestat located on
suction Hue. High pressurestat has black leads and
low pressurestat has blue leads. High pressurestat
settings are" cutout, 428 ± 5 psig; cut-in, 320 ± 20
psig. Low pressurestat settings are: cutout, 27+ 4
psig; cut-in, 60 -t- 15 psig, -0 psig.
38GC UNITS have a high-pressure relief valve
located in compressor. Relief valve opens at a
pressure differential of approximately 600 psi
between suction and discharge. 38GC units prior to
serial number A-900001 were equipped with low
pressurestat located on suction service valve. Low
pressurestat settings are: cutout, 31 ±4 psig;
cut-in, 6 0 - 1 - 1 5 psig, -0 psig. All units between
serial no. A-900001 and C-962493 not equipped
with low-pressure switch. 38GC units (using 06R
compressors) from serial no. C-962493 are equipped
with liquid line low pressurestat. Settings are:
cutout, 27 ± 4 psig; cut-in, 60 -t- 15 psig, -0 psig.
Table 6 — Service Data
COND UNIT
38GC 38GC,GF 38GF
101 102 103 104 145 105
' - ' "1
6-6
106
R-22 CHG* (Ib-oz)
GC 2-7 3-2 4-6 4-7 4-13 5-6 —
GF - 3-10 •y* > 4-14 5-2 c-3 6-9 7-8 8-3
COMPRESSOR 38GC 38GC 38 GC 06 R 06RC OBGC 06 R 06 R 06 R
1-Phase 400224 400214 .1 C3526CB ' ' ' 39 26 CE -105 564 C5425CV C5425CV C7022CV
208 V _ _ F3522CW F3922CW i - F5422CW F5422CW F7022CW
3-Phase 230 V
_
G3522CW G3922CV.. •• G5422CV; G5422CV; G7022CW
460 V __ _ H3922CV. H5422CVV H5422CV-; H7022CW
Type Start (1-Ph) PSC PSC CSRt CSR ...........CSS CSR CSR CSR
Oil Recharge (oz) 21 40 36
' L..^...................
36 46 72 72 72
COND FAN Propel ler Tvoe — D i rect Drive
Rpm GC 1650 1650 1050 1050 'ssr 1050 825 -
Rpm GF
__ 1050 1-OSQ j 1050 í. ■ 1050 1050 1050 825 825
Diam (in.) GC 16 16 18 is 20 CO 20 22 -
Diam (in.) GF - 18 18 - ' ta 20 . 20 20 22
.
Cim 2300 2400 . 2-100 2200 ¡4^ 2900 2900 3900 3900
3860102310,103310,104310; 38GF102310,103310,104310
38GC,GF103320
CSR — Capacitor Start
PSC — Permanent Split Capacitor
*Factory refrigerant charge adequate when condensing
units are connected to Carrier approved evaporators
with up to 25 ft of tubing See Refrigerant charging
for details
t38GC103 unitsare permanent split-capacitor type