26-3
®
GENERAL HVAC SYSTEM
This section outlines general service guidelines for a common HVAC system.
Figs 1 & 2 show the components and
flows of a typical A/C system.
There
are two basic system configurations:
systems that use expansion valves and
systems that use orifice tubes. BARKO
machines use the expansion valve
system.
In the Expansion Valve System
(see
Fig-1)
, the high side begins at the
compressor, continues through the
condenser, on through the receiver/drier
and ends at the expansion valve. The
low side begins where the high side left
off, at the expansion valve. From there it
continues through the evaporator and
ends at the compressor.
Air Conditioner components are shown
in Fig-2 connected together to illustrate
system operation.
The components
shown are not to scale and may not be an
exact replication of your BARKO system.
The refrigerant and refrigerant oil are clear
in color and not visible in this drawing.
The small arrows inside the components
and connecting hoses show the direction
of refrigerant flow.
Allow only certified personnel to service and maintain the air conditioning system.
The Clean Air Act
of 1992 states that anyone who works on air conditioning systems must be certified as proof of their
training. Organizations such as the Mobile Air Conditioning Society (MACS) and the National Institute for
Automotive Service Excellence (ASE) are approved by the Environmental Protection Agency (EPA) as
organizations with approved independent testing and certification programs. Contact your local EPA office
for more information.
Air conditioning systems operate under extreme high pressure.
The
containers refrigerants are sold in are also under pressure.
1 AIR CONDITIONING (A/C) SYSTEM:
Fig-1
Fig-2
WARNING
!
LOW SIDE HIGH SIDE
WARM
INLET
AIR
COOL
OUTSIDE
AIR FL
OW
HEA
TED
OUTSIDE
AIR FL
OW
COOL
AIR
TO
THE C
AB
Condenser
Expansion
Valv
e
Compressor
Receiv
er
Drier
Evapora
tor
Thermosta
t
#10 H
ose
Low P
ress
ure
Ga
seo
us S
tate
(Su
ctio
n S
ide
)
17-
30 PS
I
#6 H
ose
Liq
uid
Sta
te
#8 H
ose
Hot (
200°
) H
igh P
res
sure
Gase
ous S
tate
#10 H
ose
Cold L
ow P
ress
ure
Ga
seou
s S
tate
300 P
SI
#8 H
ose
Mete
red
Refri
gera
nt
Gase
ous
State
#6 H
ose
High P
ress
ure
Liquid S
tate
135°
06/03/2019
Updated
OPERATOR’S
Summary of Contents for 295B
Page 4: ...THIS PAGE INTENTIONALLY BLANK SUPERIOR WI USA www barko com...
Page 6: ...THIS PAGE LEFT INTENTIONALLY BLANK...
Page 27: ...THIS PAGE LEFT INTENTIONALLY BLANK...
Page 60: ...THIS PAGE LEFT INTENTIONALLY BLANK...
Page 64: ...THIS PAGE LEFT INTENTIONALLY BLANK...
