YORK INTERNATIONAL 95
FORM 150.40-NM25
DUAL CIRCUIT UNITS
2. Louvered panels are installed to reduce flow of air
over the inactive side of the condenser to aid in pre-
venting liquid build-up.
3. Below 45°F (7.2°C) fans are cycled by discharge pres-
sure only.
COMPONENTS
When the Low Ambient Kit is installed, the following
physical changes are made to the standard chiller:
1. One normally open solenoid valve is added to each
condenser circuit liquid line.
2. Louver panels are added to one side only of each
condenser circuit.
FIG. 70 – LOW AMBIENT FAN CONTROL
3. Wiring harnesses are added as necessary. See Wir-
ing Diagrams.
4. SW2 on the Micrologic Board is in the ON position.
R1 on the Combo Board must be adjusted to the de-
sired low ambient cut-out. This should be done while
Viewing Display Code 0,7.
5. 1 capacitor and varistor is added to the terminal block
located in each compressor mounted junction box.
FAN AND LOW AMBIENT SOLENOID CYCLING
The chart shown below and Fig. 70 explain how fan cy-
cling is controlled and in what sequence. The chart also
indicates when the low ambient liquid line solenoid valve
(LSA) functions.
*Fan “G” not present on all chillers. See Fig. 70 CONDENSER FAN LOCATIONS.
AMBIENT TEMP. SYSTEM 1 FANS SYSTEM 2 FANS LOW AMBIENT SOLENOID
Above 65°F Fans E & F ON: 4 sec. after Fans C & D ON: 4 sec. after De-energized (Open)
(18.3°C) compressor start compressor start
*Fans G & H ON: 30 sec. *Fans A and B ON: 30 sec.
after compressor start after compressor start
45°F (7.2°C) – Fans E & F ON: 4 sec. after Fans C & D ON: 4 sec. after De-energized (Open)
65°F (18.3°C) compressor start compressor start
Fans G & H ON: Condenser Fans A & B ON: Condenser Press
Press 300 PSI >300 PSI (2067 kPa)
OFF: Condenser Press PSI OFF: Condenser Press < 230 PSI
(1589 kPa)
0° - 45°F Fan E ON: Condenser Press Fan C ON: Condenser Press >260 Energized (Closed): No
260 PSI (1791 kPa) PSI (1791 kPa) Fans ON
OFF: Condenser Press < 210 OFF: Condenser Press <190 PSI or
PSI (1309 kPa) (1309 kPa) Fans C or E ON
Fan F ON: Condenser Press Fan D ON: Condenser Press >280 De-energized (Open):
280 PSI (1929 kPa) PSI (1929 kPa) Fans F or G & H ON
OFF: Condenser Press 0 PSI OFF: Condenser Press < 210 PSI or
(1447 kPa) (1447 kPa) Fans D or A & B ON
Fans G & H ON: Condenser Fans A & B ON: Condenser >300
Press, PSI (2067 kPa) PSI (2067 kPa)
OFF: Condenser Press PSI OFF: Condenser < 230 PSI
(1585 kPa) (1585 kPa)
LD01641
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