Carrier 38QN - Manual (Page 2)

Table 1—Physical Data
MODEL 38QN 015 018 024 030 036 042 048 060
OPER WT (lb)* 132 151 155 180 195 189 235 270
REFRIGERANT
Control
22
AccuRater'^'^ (Bypass Type)
CONDFAN
Air Discharge
AirQty(Cfm)
Mtr Rpm (60 Hz)
Propeller Type, Direct Drive
Vertical
1850 1 2400 1 3100 1 3800 | 4000 | 5000
830 1 1075 850 | 1075 | 840
CONDCOIL(fins/in.)
Tube Diam
Rows
Refrig Ckts
Face Area (sq ft)
1
Vin.
1
2 2
12.77
6
E-Coil
2 1 3 1
17.33
)
21.88
DIMENSIONS (ft-in.)
Diameter A
Height B 1-9% 2-574
2-7
3-2%
CONNECT, (in. ODF)
Suction
Liquid
Compatible Fitting (Suction) & Flare (Liquid)
% 1 %
%
REFRIG LINES
(in. ODF)
Suction
Liquid
%
%
% 1%t
♦Weight increases slightly with addition of any accessories.
t38QN048-060 require lYs-in. suction line for optimum perform­
ance. A %- X 17s-in. connection adapter accessory (Carrier Part
No. 28AU900061) is available. If a 7s-in. accessory tubing pack­
age is used, expect a slight capacity loss.
When installing, allow sufiBcient space for edrflow clearance,
wiring, refrigerant piping and servicing. Maintain a mini­
mum of 4 ft clearance from obstructions above and 18 in.
around unit (12 in. on valve side). Maintedn a distance of 24
in. between heat pumps. Position so water or ice from roof
or eaves cannot fall directly on unit.
Step 2—Replace Indoor AccuRater™ Piston, if Required-
Check indoor cod piston to see if it matches the required pis­
ton listed in Table 2. If it does not match, replace indoor cod
piston with piston shipped with this outdoor unit (located in
plastic bag taped to valves). See Fig. 2.
Table 2—AccuRater™ Chart
OUTDOOR
UNIT
38QN
OUTDOOR
PISTON
INDOOR
PISTON
015 35 46
018 40 49
024 46 59
030 55 65
036 61 73
042 67 73
048 73 82
060 78 101
FLARE NUT
Step 3—Make Piping Connections— Outdoor units may be
connected to indoor sections using Carrier accessory tubing
package or field-supplied tubing of refrigerant grade, cor­
rect size and condition (Table 1). For tubing requirements
beyond 50 ft, obtain information from local Carrier
distributor.
Outdoor Units Connected to Carrier-Approved Indoor
Units— Outdoor units contain correct system refrigerant
charge for operation with indoor unit of the same size when
connected by 25 ft of field-supplied or Carrier accessory tub­
ing. Check refrigerant charge for maximum efficiency.
A CAUTION
DO NOT BURY MORE THAN 3 FT OF REFRIGER­
ANT TUBING IN GROUND. If any section of tubing
is buried, there must be a 6-in. vertical rise to valve con­
nections on outdoor unit. If more than the recom­
mended length is buried, refrigerant may migrate to
cooler buried section during extended periods of unit
shutdown. This causes refrigerant slugging and possi­
ble compressor damage at start-up.
CONNECT REFRIGERANT LINES to fittings on unit
suction and liquid service valves (Fig. 1). Liquid service
valve has flare fitting; suction service valve has Compatible
Fitting. Make suction line connection first. Slide flare nut
on liquid line, then flare and connect liquid line. Use a maxi­
mum torque of 15 ft-lb to tighten flare nut. (Do not disas­
semble AccuRater.) Unit Compatible Fitting permits
mechanical or sweat connection as described below.
Models 38QN048,060—When using iVs in. field-supplied
refrigerant suction line, sweat-connect suction line to lYs in.
end of required connection adapter. Be sure to provide a
heat sink at the service valve to prevent damage during
sweating operation. Connect %-in. end of adapter to unit suc­
tion line Compatible Fitting. Connect liquid refrigerant line
to unit. When a 7s-in. field-supplied suction hne is used, pro­
vide a field-supplied %-in. to 7s-in. suction line adapter (not
necessary if 38LS accessory tube is used).
NOTE: Compatible Fitting on outdoor section has alumi­
num plug located beneath compatible nut on suction valve.
Plug keeps contaminants out of Compatible Fitting.
A CAUTION
When removing compatible nut, be careful pressure
build-up does not cause aluminum plug to blow and
cause personal injury. After tubing is hooked up, dis­
card plug.
A87151
Fig. 2—AccuRater (Bypass Type) Components
Mechanical Connection—Mate one set of connections at a
time.
1. Remove nut on Compatible Fitting.
2. Remove plug and be sure 0-ring is in the groove inside
the Compatible Fitting.
3. Cut tubing to correct length. Deburr and size as neces­
sary. Slide nut onto tube.
4. Insert tube into Compatible Fitting until it bottoms.
Tighten nut until it bottoms on shoulder of fitting or
valve. Keep tube bottomed in Compatible Fitting while
tightening nut.
A CAUTION
If undersized, damaged or eUipticaUy-shaped tubing is
used when making Compatible Fitting, leaks may
result.