Page 22
LGH/LCH156, 180, 210, 240, 300S
CIRCUIT 1 AND 2
ALTERNATE THROUGH
THE EVAPORATOR COIL
(not to scale)
CIRCUIT 1
CONDENSER COIL
FIGURE 21
180U & 240U REFRIGERANT CIRCUITS
CIRCUIT 2
CONDENSER COIL
CIRCUIT 1 AND 2
ALTERNATE THROUGH
THE EVAPORATOR COIL
CIRCUIT 1 -
COMPRESSOR 1 AND 2
CIRCUIT 2 -
COMPRESSOR 3 AND 4
Y1=Compressor 1 or 2 AND
Compressor 3 or 4
Y2=Compressor 1, 2, 3, 4
C-R410A Refrigerant
Units charged with R410A refrigerant operate at much
higher pressures than R22. The expansion valve and
liquid line drier provided with the unit are approved for use
with R410A. Do not replace them with components
designed for use with R22.
R410A refrigerant is stored in a pink cylinder.
IMPORTANT
Mineral oils are not compatible with R410A. If oil
must be added, it must be a polyol ester oil.
Manifold gauge sets used with systems charged with
R410A refrigerant must be capable of handling the higher
system operating pressures. The gauges should be rated
for use with pressures of 0-800 on the high side and a low
side of 30” vacuum to 250 psi with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psi of pressure with a 4000 psi burst rating.
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