Table 3 — Specifications
UNIT 619E 018 024
OPERATING WEIGHT (lb) 39 43
REFRIGERANT R-22 with AccuRaterT Control or TXV
FAN
Rpm 1120 1470
Nominal Cfm
(High Speed)
540 550
COIL
Rows 23
Face Area (sq ft) 2.56 2.56
Fins/in. 15.9 18.1
Number of Circuits 23
CONNECTIONS (MPT)
Suction (in.) Flare
5
⁄
8
Liquid (in.) Flare
3
⁄
8
Condensate Drain
5
⁄
8
LINE SIZES
Suction (in.)
5
⁄
8
Liquid (in.)
3
⁄
8
Condensate Drain
5
⁄
8
TXV — Thermostatic Expansion Valve (538S Only)
3. Insulate and caulk wall openings to reduce air infiltra-
tion and refrigerant pipe vibrations on structure.
4. Evacuate piping, if necessary. If either refrigerant pip-
ing or the indoor coil is exposed to atmospheric condi-
tions, it must be evacuated to 1000 microns to elimi-
nate contamination and moisture in the system.
V. CONNECT CONDENSATE DRAIN LINE
Observe all local sanitary codes when installing condensate
drains.
1. Connect drain line by inserting a
5
⁄
8
-in. rigid PVC pipe
over the drain connection. Refer to Fig. 11.
CAUTION:
The drain tube extension must be se-
curely fastened to the condensate drain. Failure to do
so can result in condensate water dripping onto the floor.
2. To ensure regular flow of condensate water, the drain
pipe should be pitched toward an open drain or sump at
a downward slope of at least
1
⁄
4
-in. per foot. Refer to
Fig. 12.
IMPORTANT: Be sure the drain piping has no slack which
might form a trap. Do not insert a trap in the drain line; the
drain is internally trapped.
3. Insulate condensate drain line(s). Insulate the conden-
sate drain lines that are located in or above an occupied
area with a condensate proof material such as polyure-
thane or neoprene.
Table 4 — Required Piston Sizes for AccuRater Metering Device
OUTDOOR
UNIT 538
INDOOR
UNIT 619E
INDOOR
PISTON
INDOOR
PISTON TYPE
OUTDOOR
PISTON
OUTDOOR
PISTON TYPE
REQUIRED SYSTEM
CHARGE (lb)*
A
018 018† 49 B N/A N/A 4.6
A
024 024† 57 B N/A N/A 5.3
B 018 018** 51 B 47 B 5.0
B
024 024** 59 B 52 B 5.1
LEGEND
N/A — Not Applicable
TXV — Thermostatic Expansion Valve
*Charge amount determined based on 25 ft of line. Check charge for
longer lines using superheat method. See 538A or 538B installation,
start-up, and service instructions for system charging procedures.
†Cooling only units.
**Heat pump units.
NOTE: The 538S systems do not use the AccuRater device. The 538S
systems have a TXV in the condensing unit for refrigerant metering and
control.
NOTE: Arrow on AccuRaterT body points in
free flow
direction away
from the coil.
Fig 9 — AccuRater Metering Device in Liquid Line
(Bypass Type Components)
Fig. 10 — AccuRater Metering Device at Service
Valve (Bypass Type Components)
Fig. 11 — Drain Connection
(Right Side Shown When Facing Fan Coil Unit)
—6—
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