Carrier 38CQ0 Installation, Start-Up And Service Instructions Manual

Table 1 — Installation Data (Fig. 1)
-* UNIT 38CQ 015 J 020 | 027 033 039 I 044^ 048
OPER wf (lb) 145] 160 j" 166 "TSo"~
2
W jJ220"
UNIT DIM. (ft-in.)
Length A 2-10%
Width B 1-10
Height _ C j 1-4%| 1-4% 11 -4%[ 2-014j 2-0V8| 2-01/B|2-61/8
REFRIG CONN (in.}| Compatible Fitting (Suet) & Flare (Liq)
Suction* (ODF) % | % j %
Liquid* (ODF) \
*Recommended field supplied refrigerant line sizes
LIQUID (in. ODF)
j 3/8
tMay use 7/8-in accy tubing package (slight capacity loss) See p 3
NOTES:
1 Maximum length of interconnecting tubing is 50 feet
2 Units 38CQ044, 048 factory supplied with 3/4 to 1-1/8 in suc¬
tion valve adapter (field installed) for field-supplied 1-1/8 in
suction line
INSTALLER'S PRELIMINARY SURVEY
Step 1 — Unpackage Unit — Move heat pump to
final location. Open carton at end marked
"compressor end." Slide unit from carton taking
special care to not damage service valves or grilles.
Step 2 — Inspect Equipment — File claim with
shipping company if shipment is damaged or
incomplete.
Step 3 — Complete or Consider the Following
before installing the 38CQ unit.
039 j044t 0481
1V8 1V«
UNIT 38CQ
SUCTION (in. ODF)
015 020 I 027 033
Consult local building codes and National
Electrical Code (NEC) for special installation
requirements.
When installing unit, allow sufficient space for
airflow clearance, wiring, refrigerant piping and
servicing unit. Position unit so water or ice from
roof will not drop directly on top of unit.
Make provisions for condensate drainage and
defrost water disposal whether unit is installed on
ground or roof. (Make sure unit base pan drainage
holes are not blocked.) See Mounting Pad for
details. Roof installation method for 38CQ
depends on building construction and special re¬
quirements of local codes. Roof must be capable of
supporting unit weight. Maximum allowable ver¬
tical distance between indoor and outdoor sections
is 50 feet. See Table 2.
Use an indoor coil with a bleed-type expansion
device. (See Table 2 for Carrier approved indoor
sections.) If coil does not have a bleed-type
expansion device, it may be necessary to add an
accessory start capacitor and relay to heat pump.
This would require removing compressor start
thermistor (PTC device) on units so equipped. It is
recommended that 38CQ units be used with
Carrier approved indoor sections, all of which are
equipped with a bypass type AccuRater™ (bleed-
type expansion device).
*lndoor units that require replacement of AccuRater refrigerant
control piston for optimum performance when used with specified
outdoor unit The 38CQ048 is factory supplied with no 8 piston for
indoor unit (28MQ048)
© Carrier Corporation 1977
38CQ400105 B
Form 38CQ-6SI