Carrier 38AQ034 - Manual (Page 3)

SUCTION PIPING AT INDOOR COIL AND TXV
BULB LOCATION — The purpose of these recom­
mendations is to achieve good mixing of refrigerant
leaving indoor coil suction header for proper sensing by
the TXV bulb.
1. A minimum of two 90° elbows must be installed
upstream of the expansion valve bulb location.
2. The TXV sensing bulb should be located on a vertical
riser where possible. If a horizontal location is neces­
sary, secure the bulb at approximately the 4 o’clock
position.
3. Size suction line from indoor coil through the riser
for high velocity. Enter suction pipe sizing charts in
the Carrier System Design Manual at design tons
and equivalent length (for 2 F loss). If reading falls
between 2 sizes on chart, choose the smaller pipe size.
Suction piping for the high velocity section should be
selected for about 0.5 F friction loss. If a 2 F loss is
allowed for the entire suction line, 1.5 F is left for the
balance of the suction line and it should be sized on
that basis. Check that high-velocity sizing is adequate
for oil return up the riser.
When the compressor is below indoor coil, the riser
at indoor coil does not have to extend as high as the
top level. After a 15 diameter riser has been provided,
suction line may elbow down immediately.
Table 2 — Physical Data
UNIT 38AQ 024 028 034
OPERATING W EIGHT (lb) 2040 2160 2500
REFRIGERANT R-22
Operating Charge (ib)* 55 61 71
COMPRESSOR
Model No 06E2250 06E6265 06E2275
Cylinders 4 6 6
Oil (pts) 14 19 19
Crankcase Heater (watts) 180
OUTDOOR AIR FANS
Number 3
Rpm; 60-Hertz 1140 (3-Ph); 1075 (Single-Phase)
Diameter (in ) 26 30 30
Motor Hp 3/4 1 1
Cfm 15 000 24 000 24 000
Kilowatts 3 4 3 4 3 6
OUTDOOR COIL
Rows Deep . Fins/Inch 3 15
Face Area (sq ft) 35 4 39 0 49 6
Storage Capacity (lb|t 70
1
99
CONTROLS
High Press Switch (HPS)
Cutout (psig) 426 ± 7
Cut-in (psig) 320 ±20
Loss-of-Charge Switch (LCS) —
Liquid Line
Cutout (psig) 5 ±3
Cut-in (psig) 20 ±5
UNIT38AQ 024 1 028 034
CONTROLS (cont)
Fan Cycling Press Switch (FCPS)—
No 2 Fan Cycling
Opens (psig) 126 ±4
Closes (psig) 257 '¿S
THERMOSTAT
Defrost Thermostat (DFT)
Opens (F)
Closes (F)
65 ±5
28 ±3
Fan Cycling Thermostat (ATS) —
No 3 Fan Cycling
Opens (F)
Closes(F)
70 ±3
83 max
FUSIBLE PLUG SETTING
Liquid Line (F)
Accumulator (F)
210 ±10
170 ±10
OIL PRESS SAFETY SW ITCH (OPS)
Set Point (psig)
Differential (psig)
9
28
'Approximate charge with 25 ft of interconnecting piping Use appropriate
charging charts for actuai charging of unit
fRefrigerant storage capacity at 120 F condensing temperature with con­
denser 80% fuli of iiquid
FUSIBLE PLUG
FUSiBLE PLUG
ACCUMULATOR
LOSS-OF-CHARGE SW ITCH
FAN CYCLING PRESSURE
SW ITCH
DEFROST THERMOSTAT
AIR TEMPERATURE
SW ITCH
COMPRESSOR UNLOADER
SOLENOID
MUFFLER COMPRESSOR
SERVICE
VALVE
Fig. 3 — Component Locations