Carrier 38VH - Manual (Page 2)

Table 1 — Physical Data
MODEL 38VH 001 0021003 004 045 005
OPER WT (lb) 165 20q 205 225 240 250
DIMEN. (ft-in.)
Diameter A
Unit Height B
Coil Height C
2- 8
1-11
2
3-2 3-2
2-5 2-5
-5-1/4
3- 8
2-11 3- 8
2-11 3- 8
2-11
REFRIG CONN*
Suction (in. ODF)
Liquid (in. ODF) 5/8 1 3/41 3/41 3/4 I 3/4 | 3/4
3/8
*AII models except 38VH001 are supplied with a 3/4-in to
1-1/8 in suction valve connection adapter (field installed)
for 1-1/8 in suction line (field supplied)
INSTALLATION
Step 1 — Check Equipment and Jobsite
UNPACKAGE UNIT — Move to final location.
Slide from carton taking special care not to damage
service valves or grilles.
INSPECT EQUIPMENT — File claim with ship­
ping company if damaged or incomplete.
COMPLETE OR CONSIDER SYSTEM RE­
QUIREMENTS before installation:
Consult local building codes and National
Electrical Code (NEC) for special installation
requirements.
When installing, allow sufficient space for airflow
clearance, wiring, refrigerant piping and service.
Recommended space minimum requirements are:
overhead — 4 ft, perimeter — 3 ft (Fig. 1). Position
so water from roof or eaves does not pour directly
on unit.
Install on a solid, level mounting pad. Position
tie-down bolts in pad. Any 2 holes in unit base may
be used to fasten unit to pad.
Carrier Cooling System Capacity Optimization may
require field replacement of piston in AccuRater™
(bypass type) refrigerant control supplied on evap­
orator. See Table 2. Enter table at cooling system
Outdoor Air Design Temperature closest to that of
locality. Find AccuRater Piston number required
for condenser/evaporator system being installed.
Piston change is not necessary if table indicates that
required piston is factory installed in evaporator coil.
When evaporator is more than one size larger
than condensing unit (i.e. 38VH002I28AR036), re­
move AccuRater and use a bleed-type thermal
expansion valve (TXV) for refrigerant control. Size
TXV to nominal capacity of condensing unit.
A replacement AccuRater piston is factory sup­
plied on Models 38VHOO 1,002,003 and 004. This
piston is correctly sized for an evaporator of the
same capacity as the condensing unit at an outdoor
air design temperature of 95 F. Mix-matching and
outdoor air design temperatures other than 95 F
may require another piston number or thermal ex­
pansion valve. (Refer to Table 2.)
Replace piston as required before connecting
refrigerant lines. Bypass type AccuRater com­
ponents are shown in Fig. 2. Piston replacement
i Standard factory-installed AccuRater piston
*The 28VH piston designations are applicable to full temperature
range
fSize 70 piston factory supplied with 28VH004 .
NOTE: Piston numbers effective December 1, 1979
instructions are included in evaporator Installation
book. After system installation is complete, use
Chargemaster charging device or 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 same size when they are connected by 50 ft
of field-supplied tubing of recommended size (see
Piping Connections) or 50 ft or less of Carrier acces­
sory tubing. Check refrigerant charge for maximum
system efficiency. See Refrigerant Charging for
details.
Fig. 2 — AccuRater (Bypass Type)
Components