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Page 4 / SD-134
POSSIBLE CAUSE
1. Insufficient refrigerant charge to
adequately flood condenser
2. LAC fails to close due to:
a. Foreign material in valve.
b. Loss of air charge in element.
3. Wrong setting on LAC (e.g. 100 psig
on Refrigerant 22 or 502 system)
4. Discharge line to LAC restricted.
POSSIBLE CAUSE
1. Dirty condenser coil.
2. Air on condenser blocked off.
3. Too much refrigerant charge.
4. Undersized receiver.
5. Non-condensable (air) in system.
6. Liquid port or liquid line plugged.
7. Wrong setting on LAC (e.g. 180 psig
on Refrigerant 12 systems).
8. Spring overheated during
installation, increasing the LAC
setting.
9. Condenser fans not running.
⚠WARNING – USER RESPONSIBILITY
Failure or improper selection or improper use of the products described herein or related items can
cause death, personal injury and property damage.
• This document and other information from Parker-Hannifin Corporation, its subsidiaries and authorized distributors provide
product or system options for further investigation by users having technical expertise.
• The user, through its own analysis and testing, is solely responsible for making the final selection of the system and
components and assuring that all performance, endurance, maintenance, safety and warning requirements of the
application are met. The user must analyze all aspects of the application, follow applicable industry standards, and follow
the information concerning the product in the current product catalog and in any other materials provided from Parker or
its subsidiaries or authorized distributors.
• To the extent that Parker or its subsidiaries or authorized distributors provide component or system options based upon
data or specifications provided by the user, the user is responsible for determining that such data and specifications are
suitable and sufficient for all applications and reasonably foreseeable uses of the components or systems.
FOR USE ON REFRIGERATION and/or AIR CONDITIONING SYSTEMS ONLY
© 2021 Parker Hannifin Corporation
MALFUNCTION - LOW HEAD PRESSURE
MALFUNCTION - HIGH HEAD PRESSURE
Parker Hannifin Corporation
Sporlan Division
206 Lange Drive • Washington, MO 63090 USA
phone 636 239 1111 • fax 636 239 9130
www.sporlan.com
REMEDY
1. Charge system according to
Manufacturers Specifications or if
unavailable use Bulletin 90-30-1.
2. See Below:
a. Cause LAC to open by raising
condensing/receiver pressure
above valve setting by cycling
condenser fan. If foreign material
does not pass through valve,
replace LAC.
b. Replace LAC.
3. Replace LAC with valve with correct
setting.
4. Remove restriction in fitting(s) or line.
REMEDY
1. Clean coil.
2. Clear area around unit.
3. Remove charge until proper head
pressure is maintained.
4. Check receiver capacity against
refrigerant required to maintain
desired head pressure.
5. Purge from system.
6. Remove blockage in port or liquid
line.
7. Replace LAC with valve with correct
setting.
8. Replace LAC.
9. Repair or replace fan motor.
SD-134 / 82021
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