Johnson Controls Serie Instrucciones De Instalación

P70, P72, and P170 Series Controls for Dual
Pressure Applications
Installation Instructions
Applications
The P70, P72, and P170 Controls for Dual Pressure
Applications provide combined high and low pressure
control of compressors on commercial refrigeration and
air conditioning applications.
IMPORTANT: Except for those models listed as
refrigeration temperature limiting controls, use this
P70, P72, and P170 Series Controls for Dual
Pressure Applications only as an operating control.
Where failure or malfunction of the P70, P72, or
P170 Pressure Control could lead to personal injury
or property damage to the controlled equipment or
other property, additional precautions must be
designed into the control system. Incorporate and
maintain other devices, such as supervisory or
alarm systems or safety or limit controls, intended to
warn of or protect against failure or malfunction of
the P70, P72, or P170 Pressure Control.
P70S and P170S models have independently operated
high and low pressure Single-Pole Double-Throw
(SPDT) switches that can be wired to satisfy a variety
of control requirements. These adaptable controls have
a high pressure manual reset lockout mechanism that
is convertible to automatic reset. See Table 1.
P70L, M, N, and P170L, M, N models have a Single-
Pole Single-Throw (SPST) switch. Models are
available with automatic or manual reset lockout
options. Models with manual reset are available with
either high-side-only manual reset, or low-side and
high-side manual reset. (See Table 1 and Table 3.)
Ammonia compatible models are available (P70L and
P70M only). See Table 2.
Refer to the
P70, P72, and P170 Series Controls for Dual Pressure Applications Installation
QuickLIT Web site for the most up-to-date version of this document.
P72 models have a Double-Pole Single-Throw (DPST)
switch with load-carrying contacts that can provide
direct control of 208/240 VAC, single-phase motors up
to 3 hp, 480, and 600 VAC single-phase
non-compressor motors and 208/220 VAC, 3-phase
motors up to 5 hp. See Table 3.
These controls are available in several pressure
ranges and are compatible with most common
refrigerants. Ammonia-compatible models are also
available (P70L and P70M only). See Table 2.
The MICRO-SET® option provides fine adjustment of
the differential setting for precision pressure control of
low pressure applications.
Some models feature Limited Knob Adjustment, which
restricts adjustment of the pressure settings and deters
over-adjustment or tampering. See Low Pressure
Limited Knob Adjustment.
A Manual Reset Lockout option does not allow the
pressure control to reset automatically after CUT OUT
is reached, and provides shutdown capability for
unmonitored equipment. See Manual Reset Operation.
NEMA 1 enclosures are standard on most models.
NEMA 3R enclosures are also available.
Table 1 through Table 2 list the standard models and
features of P70, P72, and P170 controls for dual
pressure applications. These standard models are
available through most authorized
Johnson Controls/PENN® distributors.
Part No. 24-8607-0, Rev. H
Issued March 2016
Instructions
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