Application guidelines
16 FRCC.PC.002.A4.22
Operating conditions
Operating limits
High pressure
A low-pressure (LP) safety switch must also be
used; deep vacuum operations will result in
failure. The minimum LP safety switch (loss of
charge switch) setting is 0 relative bar (0 bar g).
For systems without pump-down feature, the LP
safety switch must be either a manual lockout
device or an automatic LP safety switch wired
into an electrical lockout circuit. LP switch tole-
rance must not allow for vacuum operation of the
compressor. LP safety switch settings for pump-
down cycles with automatic reset are listed in the
following table.
A high-pressure (HP) safety switch is required to
shut down the compressor should the discharge
pressure exceed the values shown in the table
below. This switch can be set at lower values
depending on the application and ambient
conditions. It must be either located in a lockout
circuit or associated with a manual reset device to
prevent cycling around the high pressure limit.
If a discharge valve is used, the HP switch must
be connected to the service valve gauge port,
which cannot be isolated.
Low pressure
NTZ – R404A / R507
Working pressure range, high side psig 191 - 402
Working pressure range, low side psig 1.4 - 48
Minimum low pressure safety switch setting psig 0
Minimum low pressure pump-down switch setting psig 3
Relief valve opening pressure dierence psig 435
Relief valve closing pressure dierence psig 116
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