6
VI. Principles of Operation
Kooltronic HL Series Air Conditioners are designed for Class I, Division 1 and Division 2 and Class I, Zone 1 and Zone 2
applications. They are used only when installed on pressurized customer enclosures and connected to a pressurized
enclosure Purge/Pressurized Control System.
When Kooltronic HL Series Air Conditioners are installed on Class I customer enclosures, before operating they must
be purged simultaneously with the pressurized customer enclosure according to the purge protocol for that pressurized
enclosure.
The Purge/Pressurized Control System has to be selected by first taking into account the Kooltronic HL Series Air
Conditioner volume and air leakage (these parameters are specified in the Technical Data on page 14), in addition to the
volume and air leakage of the pressurized customer enclosure. The Kooltronic HL Series Air Conditioner and the
pressurized customer enclosure must be connected to the Purge/Pressurized Control System by gas (air) lines in
parallel.
The Kooltronic HL Series Air Conditioner must be powered from the pressurized customer enclosure power supply, and
the customer enclosure must be controlled by the Purge/Pressurized Control System.
All electrical and electronic components in the Kooltronic HL Series Air Conditioner are located in the pressurized
evaporator enclosure.
Mechanical components, including the condenser blower housing and wheel, are made of aluminum, and are installed
in the condenser compartment, exposed to ambient air. The condenser blower motor shaft extends from the evaporator
compartment to the condenser compartment, and is sealed by a set of PTFE V-rings.
If condensate occurs in the Kooltronic HL Series Air Conditioner it will be removed through a drain line. In order to prevent
pressurized gas (air) loss, the condensate drain system utilizes a floating type gate valve.
0.00
1.00
2.00
3.00
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
i.w.g
K3A4C12HL56LV AIR LEAKAGE
A
I
R
L
E
A
K
A
G
E
C
F
M
