ECOSAIRE EN Series, Owner'S Manual

Page: 97 / 142

Ecosaire
®
EN Series Precision Air Conditioner Owners Manual
92 Ecosaire ® July 2009
Data subject to change without notice.
Operation Controller Diagnostics
*** ALARM ***
00:00 00/00
Compressor 1
Low pressure
CHECKS
1. Check that there is adequate air
flow. See previous alarm
“Change air filters”.
2. Check for dirt or corrosion on
the evaporator.
3. Check that the room temperature
is within 20% of design
specification.
4. Check that the room relative
humidity is within 20% of design
specification.
5. Check the refrigerant low pres-
sure. It should be above 55 PSI
after the compressor has been
running for two minutes.
6. Check the operation of the refrig-
erant low pressure switch. It
should open as the pressure falls
below 20 PSI and close as the
pressure rises above 50 PSI.
CORRECTIONS
•
Correct as in previous alarm “Change air filters”.
•
Clean or replace as necessary.
•
Correct temperature set points for design
conditions.
•
Correct humidity set points for design conditions.
•
Check operation of the liquid line solenoid valve.
The valve should be open when the associated
compressor is running, except in pump-down
mode.
•
Check the refrigerant expansion valve setting.
•
Check that the pressure drop across the liquid
line filter-drier is less than 5 PSI.
•
Add refrigerant if needed.
•
Adjust or replace as necessary.
OPERA
TION