Carrier 38EC - Manual (Page 2)

4-0 OVERHEAD SPACE REQUIRED
FOR SERVICE AND AIRFLOW
liDIAM HOLE
FOR POWER
WIRING
LIQUID VALVE SERVICE PORT
CONDENSER AIRFLOW
r -6 AIRFLOW
AND SERVICE
CLEARANCE
SUCTION VALVE SERVICE PORT
*CONCRETE PAD SHOULD WEIGH I 5 TO 2 TIMES WEIGHT OF UNIT
Certified dimension drawings available on request
Fig. 1 — Dimensions. Connections and
Mounting Pad (Refer to Table 1.)
Carrier Cooling System Capacity Optimization —
AccuRater™ (bypass type) refrigerant control, with
field-replaceable piston (see Fig. 2), is supplied on
evaporator. Use Optimization Chart, Table 2, to
find AecuRater piston size required for eondenser/
evaporator system being installed. Pistons are cor-
reetly sized for an evaporator of the same capacity as
the condensing unit, so piston change is not neces­
sary. Mix-matching of condensing unit with evap-
orator i^^if^field replacement of piston. Refer to
Table 2. Replace piston, if required, before connect­
ing refrigerant lines. Piston replacement instructions
are ineluded in evaporator installation book. After
system installation is complete, use Charging Chart
to check and/or adjust refrigerant charge.
Condensing Units Connected to Carrier-Approved
Evaporators — Condensing units contain correct
system refrigerant charge for operation with evap­
orator of the same size when connected by 25 ft
of field-supplied or Carrier accessory tubing.
Check refrigerant charge for maximum efficiency
(see Refrigerant Charging, page 6).
Table 2 — Optimization Chart
(Outdoor air design temperature. db-F.
100 F and below)
COND
UNIT
ACCURATER™ piSTON NO.
Evap Size (Coil or Fan Coil)
38EC
014 018 024 030 036 042 048 060
018 — 46 52 TXV —
— —
024 — — SS 57 TXV — — —
030 —
—
— 63 65 TXV _ —
036 — — — — 67 70 TXV —
042 — — — — — ■■■■76 78 TXV
048 — — —
— —
— S3 82
060 — — —
- -
— ■ ; 64
Factory-installed piston Obtain replacement pistons thru
local Carrier distributor
Fig. 2 — AccuRater (Bypass Type)
Components
■Step 2 — Make Piping Connections — Con­
densing units may be conneeted to evaporator sec­
tions using Carrier accessory tubing package (Table
3) or field-supplied tubing of refrigerant grade,
correct size and condition (Table 1). For tubing
requirements beyond 50 ft, obtain information from
local Carrier distributor.
WARNING if ùt
If 1-1/8 in. tubing is used (38EC048,060), braze
it to theaecessory 1-1 / 8 x 3/4-in. suction eonnection
adapter (Carrier Part No. 28VQ900011) or to eor-
rectly sized field-supplied adapter, then make Com­
patible Fitting connections.