Installation Instructions
GENERAL
The accessory refrigerant pressure transducer and suc-
tion superheat package is intended for use with the
48NP/50NB,NP units only. When installed using these in-
stallation instructions, this accessory package will improve
head pressure control, as well as provide increased diagnos-
tic capability by monitoring compressor discharge and suc-
tion pressures and suction superheat. See Package Contents
table and Fig. 1 for package contents.
Installation of the discharge pressure transducers in this
kit will replace the function of the saturated condensing tem-
perature thermistors (T3 and T4), and installation of the suc-
tion pressure transducers will replace the function of the low-
pressure switches. The control will no longer require inputs
from these thermistors and switches once this installation is
complete.
IMPORTANT: The PSIO2 accessory package number
50DJ902431 must also be installed in order to provide
suction superheat monitoring.
PACKAGE CONTENTS
ITEM
QUANTITY*
Thermistor
2
Transducer
4
Compression Fitting
2
Wire Nuts (2 types)
13
PSIO1 Plug Assembly
1
Transducer Plug Harness
4
Connection Box
2
Connection Box Cover
2
Connection Box Connector
4
Connection Box Bracket
1
PVC-Jacketed Cable
28 ft
Red and Black Wire Assembly
2
Varnish Cloth
4
Wire Tie
2
Screw
2
*Not all items will be used in each installation. Refer to the Installation
section for the items and quantities required for each individual in-
stallation. Extra parts not needed may be discarded.
TRANSDUCER
1/4-IN. FEMALE QUICK CONNECTS
RED AND BLACK
WIRES (USED
FOR 034-074
UNITS ONLY)
PSIO PLUG
ASSEMBLY
PVC-JACKETED CABLE
TRANSDUCER PLUG HARNESS
LEAD END
THERMISTOR
PROBE END
COMPRESSION
FITTING
WIRE NUTS
NOTE: Screws, varnish cloth, connectors, connection boxes and
covers, and connection box mounting bracket not shown.
Fig. 1 — Package Contents
48NP/50NB,NP
Accessory Pressure Transducer
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
1
Tab
1a 1b
PC 111
Catalog No. 564-923
Printed in U.S.A.
Form 48/50N-1SI
Pg 1
12-93
Replaces: New