within a few seconds of releasing the arrow button. Unit capacity sizing is based
on maintaining a 72-degree F. temperature. For every degree below 72 degrees
F. the unit selected must have an additional 6,000 Btus of capacity for a 100
square foot server room. Please note, if the heat load of the room exceeds
the capacity of the unit, the unit will not shut off and may freeze up. If the
unit freezes up, raise the set point at least 2 degrees in order to allow the unit to
hit its set point and cycle off.
5. BUILT IN UNIT SAFEGUARDS
a. Compressor Protection Time Delay – An internal overload circuit to prevent
overheating protects the compressor. There is a two-minute time delay in the
control system to prevent short-cycling of the compressor. The delay is in effect
anytime the compressor is turned on, whether by the controls or resumption of
power after an outage. The display will flash the “F” of the C” during the timeout.
b. Fan Cycling – All KwiKool models, except water-cooled units, are equipped with
fan cycling, which provides limited coil freeze protection from low ambient
temperatures and reduces startup current. The condenser fan comes on as coil
heat load requires, but does not start with the compressor. The condenser fan
will cycle more frequently at lower ambient temperatures of the intake air (under
80 degrees F.)
c. High-Pressure Switch – The compressor is equipped with a high pressure shut
down switch. If the unit is subjected to ambient temperatures above its design or
if the unit has condenser ducting beyond its recommended length, the safety
switch will trip to protect the compressor from excessive head pressure damage.
Check for restrictions in the condenser ducts and make sure that the space
above the ceiling has sufficient air flow or cubic space to absorb the rejected
heat. After correcting the problem reset the high-pressure switch by opening the
service door and pressing the red button on top of the control box. You should
feel the switch click. It is located near the filter dryer on the small high-pressure
line. Close the service door and restart the unit.
d. Low-Pressure Switch – All KwiKool models has a low-pressure switch, except
for the KPAC models, which protects the compressor from low-pressure damage.
The low-pressure switch is located above the compressor inside the service door
with two yellow wires connected to it. This switch will trip when the intake
condenser air pressure drops below recommended specifications, which may be
due to a constrained airflow from the condenser intake.
e. Service Ports and Sight Glass – Service ports and sight glass are used for
convenient diagnosis of refrigerant pressures. For all models the service ports
are located inside the return air grill. For SAC air-cooled models the site glass is
inside the condenser intake. For water-cooled SWAC models they are inside the
back service door. For water-cooled SWAC and split-system SPLAC models the
sight glass is inside the service door. It is normal to observe bubbles in the
site glass and does not indicate a low refrigerant level.
6. APPLICATION SAFEGUARDS
a. Automatic Restart – The system will resume operation automatically
after a power interruption and returns to the previous settings.
b. Condensate Tank – When the condensate tank is full, an audible
alarm will sound, and the compressor will stop running and the control panel will
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