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Application Guidelines
Discharge temperature
protection
20
FRCC.PC.026.A4.02
Operating conditions
85
80
75
70
68.3
65
62
60
55
50
45
41.7
40
35
30
25
20
15
10
5
0
-5
-10
-45
-40
-35
SH 30K
The discharge gas temperature must not exceed
135°C.
The discharge gas thermostat accessory kit (code
7750009) includes all components required for
installation as shown below. The thermostat must
be attached to the discharge line within 150 mm
from the compressor discharge port and must be
thermally insulated and tightly fixed on the pipe.
A DGT protection is required if the high and
low pressure switch settings do not protect
the compressor against operations beyond its
specific application envelope. Please refer to
the examples below, which illustrate where DGT
protection is required (Ex.1) and where it is not
(Ex.2). A discharge gas temperature protection
device must be installed on all heat pumps. In
reversible air-to-air and air-to-water heat pumps
Example 1 (R410A)
LP switch setting:
LP1 = 3.3 bar (g) (-15.5°C)
HP switch setting:
HP1 = 38 bar (g) (62°C)
Risk of operation beyond the applica-
tion envelope.
DGT protection required.
Example 2 (R410A)
LP switch setting:
LP2 = 4.6 bar (g) (-10.5°C)
HP switch setting:
HP2 = 31 bar (g) (52°C)
No risk of operation beyond the
application envelope.
No DGT protection required.
Map CH485
-30
-25
-20
-15
-10
Evaporating temperature (°C)
SH 10K
Discharge line
the discharge temperature must be monitored
during development test by the equipment
manufacturer. The DGT should be set to open
at a discharge gas temperature of 135°C. The
compressor must not be allowed to cycle on the
discharge gas thermostat. Continuous operations
beyond the compressor's operating range will
cause serious damage to the compressor!
70
65
60
55
50
45
40
35
LP1
30
25
20
15
10
-30
-25
-20
-15
-5
0
5
10
15
20
SH 5K
Thermostat
Insulation
Bracket
Example 1
Example 2
Map example R410A
LP2
-5
0
5
10
-10
Evap. temp. (°C)
25
30
HP1
HP2
15
20
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