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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53380009-01 Printed in U.S.A. Form 38AP-5SI Pg 1 5-10 Replaces: New
Installation Instructions
Part No.: 38AP-900---011, 38AP-900---012, 38AP-900---013
SAFETY CONSIDERATIONS
When installing this accessory, observe precautions in the
literature and on any labels attached to the equipment, and all
other safety precautions that may apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling and installing this accessory.
INTRODUCTION
An accessory long line check valve must be installed for:
1. Any 025-030 size dual circuit unit where the evapora-
tor is located higher than the condensing unit and the
linear line length exceeds 55 ft (16.8 m).
2. Any size dual or single circuit unit with linear line
length of 100 ft (30.5 m) or more.
The kit consists of a liquid line check valve and a bypass
check valve to prevent charge migration to compressor.
INSTALLATION
The long line check valve accessory must be mounted in the
liquid line near the condensing unit. The valve is brazed into
the liquid line. Fitting adapters may be required to connect the
check valve to the liquid line. The valve may be mounted in
any orientation, horizontally or vertically. See Fig. 1 for dimen-
sions. Figure 2 shows the location of the check valves on a
rooftop installation. Figure 3 shows the location of the check
valves on a ground level installation.
ACCESSORY USAGE
WARNING
To avoid the possibility of electrical shock, open and tag all
disconnects before installing this equipment. Failure to do
so could result in severe personal injury.
CAUTION
For all units with liquid lines of 100 ft (30.5 m) or more or
any 025-030 size dual circuit unit application where evapo-
rator is located higher than the condensing unit and liquid
lines exceed 55 feet (16.8 m), a long line check valve must
be installed to prevent compressor failure. The long line
check valve accessory must be mounted in the liquid line
as close as possible to the condensing unit.
UNIT
SIZE
CIRCUIT
TYPE
CHECK
VALVE SIZE
(in. ODF)
ACCESSORY USAGE (QUANTITY) — PART NO. 38AP-900---
011 012 013
38APD/S025
Dual 5/8 + 5/8 2 — —
Single 5/8 1 — —
38APD/S027
Dual 5/8 + 5/8 2 — —
Single 5/8 1 — —
38APD/S030
Dual 5/8 + 5/8 2 — —
Single 7/8 — 1 —
38APD/S040
Dual 5/8 + 5/8 2 — —
Single 7/8 — 1 —
38APD/S050
Dual 5/8 + 5/8 2 — —
Single 7/8 — 1 —
38APD060 Dual 5/8 + 7/8 1 1 —
38APS065 Single 7/8 — 1 —
38APD070 Dual 7/8 + 7/8 — 2 —
38APD080 Dual 7/8 + 7/8 — 2 —
38APD090 Dual 7/8 + 7/8 — 2 —
38APD100 Dual 7/8 + 7/8 — 2 —
38APD115 Dual 7/8 + 7/8 — 2 —
38APD130 Dual 7/8 + 1 1/8 — 1 1
38APS025-065
38APD025-130
Long Line Check Valve Accessory
50/60 Hz