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30 AB218186428184en-US1501
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage operating envelope
R22, R410A
Model variation U
Evaporating temperature (°F)
Condensing temperature (°F)
SH 20°F
-22 -13 -4 5 14 23 32 41 50 59
68
77
86
95
104
113
122
131
140
149
158
R22 R407C R410A
Working pressure range high side psi (g) 158-402 152-422 229-645
Working pressure range low side psi (g) 20-100 16-93 28-157
Maximum high pressure safety switch setting* psi (g) 421 435 653
Minimum low pressure safety switch setting psi (g) 7 7 22
Recommended pump-down switch settings psi (g)
22 psi below nominal evap. pressure with
minimum limitation as below
Minimum low pressure pump-down switch setting psi (g) 22 19 33
*
Maximum allowable pressure on high pressure side according to PED regulation.
R
LP and HP safety switches must never
be bypassed nor delayed and must stop all the
compressors.
When caused low by LP safety switch, limit the
number of auto-restart to maximum 5 times
within 12 hours.
HP safety switch must be manual reset
Depending on application operating envelope,
you must define HP and LP limits within
operating envelope and pressure setting table
above.
For H-series compressors, the external Discharge
Gas Temperature protection (DGT) is required
if the high and low pressure switch settings do
not protect the compressor against operations
beyond its specific application envelope.
The discharge gas thermostat accessory kit (code
7750009) includes all components required
for installation as shown on the right. DGT
installation must respect below requirements:
• The thermostat must be attached to the
discharge line within 5.91inch from the
compressor discharge port and must be
thermally insulated and tightly fixed on the pipe.
• The DGT should be set to open at a discharge
gas temperature of 275°F.
Discharge line
Insulation
Bracket
Thermostat
High and low pressure
protection