Product Overview

P499 Series Electronic Pressure Transducers Product/Technical Bulletin 3
Installation
See Mounting and Wiring for information on installing
the P499 Series Electronic Pressure Transducers.
Parts Required
P499 transducers require wire harnesses for all models
that do not have an integral cable. Use Table 2 to
select a wire harness.
Mounting
The P499 transducer mounts directly to most
refrigeration equipment pressure tap ports.
To mount the P499 transducer:
1. Hand thread the P499 transducer to the pressure
tap point.
2. Tighten the connection using the wrench flats
provided to avoid damaging the transducer.
3. Perform a leak test on fittings and connections
before putting the system into operation.
Wiring
Follow the wiring guidelines given to avoid causing
damage to the P499 transducer and improper
equipment operation:
• Ensure wiring conforms to the National Electrical
Code and local regulations.
• Do not apply more than the maximum supply
voltage to the transducer. See Technical
Specifications .
• Do not extend the wiring harness leads more than
250 ft (76 m). Use 22 AWG, 3-wire, shielded cable
to extend wiring harness leads.
• Do not run low-voltage cable in conduit or wiring
troughs with high-voltage wires.
• Ensure that the shielded cable is terminated
according to code and the control’s instructions.
Wiring in Hazardous Locations
P499 transducers are UL Recognized for use in
Class I, Division 2 hazardous locations. Follow these
additional guidelines when wiring or servicing a
P499 transducer in a hazardous location.
• P499 Series Pressure Transducer models do not
have provisions for field wiring. They are suitable
for factory installation only. P499 transducers must
be installed in a suitable enclosure.
Table 2: Wire Harnesses with Packard
Connectors
Product Code Number
1
1. Wire harnesses for P399 transducers and
P499 transducers are interchangeable.
Length
WHA-PKD3-200C 6-1/2 ft (2.0 m)
WHA-PKD3-400C 13 ft (4.0 m)
WHA-PKD3-600C 19-5/8 ft (6.0 m)
!
CAUTION: Risk of Property Damage.
Mount the pressure control separately
from the electrical cabinet and seal all
electrical piping to prevent ammonia from
migrating to the electrical components.
Where there may be exposure to
ammonia, use only ammonia compatible
control modules and pressure
connections. System shutdown due to
improper adjustment may cause property
damage.
IMPORTANT: When installing the
P499 transducers, observe all regulations governing
the handling and containment of hazardous or
regulated materials (refrigerants or lubricants).
IMPORTANT: Locate pressure tap points on the
top side of the refrigerant lines to reduce risk of
equipment damage or malfunction caused by
accumulation of oil, liquids, or sediment in the
pressure chamber.
IMPORTANT: Avoid severe pressure pulsations on
high-side pressure connections by positioning the
transducer away from compressor discharge.
!
CAUTION: Risk of Electric Shock.
Disconnect power supply before making
electrical connections to avoid electrical
shock.
!
WARNING: Risk of Explosion or Fire
Do not disconnect the P499 pressure
transducer while its circuit is energized,
unless the location is known to be
nonhazardous. Disconnecting the P499
transducer in a hazardous location while
its electrical circuit is energized may
result in an explosion or fire and may
cause serious injury or death.