Addison DC Series Manuale di installazione, funzionamento e manutenzione - Pagina 8
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50°F to 53°F, the variable speed fan will ramp between
maximum and minimum speed while the constant speed
COOLING SYSTEMS OPTIONS
At 53°F, both fans are operating; the variable speed at
minimum RPM and the constant speed at full RPM. As
the ambient continues to rise, the variable speed motor
increases to full speed and remains there.
If the application calls for a closer setting between
maximum and minimum pressure settings on the
constant speed fan, for example 440 psig on, 390 psig
off, the effect will be to lengthen the temperature span
during which the cycling takes place, for example 50°F
to 57°F.
MECHANICAL ADJUSTMENTS
SET FAN RPM.
All evaporator motor sheaves are set when tested and
shipped from the factory. Actual rpm must be set and
verified with a tachometer. Refer to the following Blower
Performance Chart for basic unit fan rpm.
With disconnect switch open, place a jumper wire across
Terminals R and G at TS1 Terminal Block. Close
disconnect switch; evaporator fan motor will operate so
rpm can be checked.
FAN ROTATION CHECK
Check that fan rotates clockwise when viewed from the
drive side of unit and in accordance with rotation arrow
shown on blower housing. If it does not, reverse two
incoming power cables at TB Terminal Block.
Do not attempt to change load side wiring. Internal wiring
assures all motors will rotate in correct direction once
evaporator fan motor rotation check has been made.
fan cycles. The start-stop cycle varies from 45 seconds to
2½ minutes during this period.
Adjustable High and Low Pressure Switches
Standard cooling units are equipped adjustable pressure
switches. The low pressure switch is adjustable between
0psig – 150 psig and is factory set to open at 60 psig
and close at 35psig. The high pressure switch is
adjustable between 200 psig. And 610psig and factory
set to open at 600psig and to close at 550 psig
FORWARD CURVE
Blower Rotation
Figure 4
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