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SWITCHES
PRESSURE SWITCHES
4
3
2 1
RED DOT TRINARY
™
PRESSURE SWITCHES - GENERATION II
RED DOT TRINARY
TM
HARNESS
71R4501
RD-5-12150-0P
TRINARY
TM
boot ( provides a molded 4 wire connection to Trinary switch; lead wires are 28”long. ) helps
eliminate terminal corrosion and breakage.
This switch assembly performs three distinct func-
tions. The first function prevents the compressor
from operating if system charge is lost or ambient
temperature is too low. The second stops compres-
sor if head pressure increases to unsafe levels. It
automatically resets when pressure drops back to
normal. The third function is a shutter/fan override
switch that keeps head pressure within normal
range by opening shutters or operating engine fan
to increase air flow across condenser when head
pressure rises above set valve.
Install Trinary on liquid side of a/c system between
condenser and expansion valve. For use with R-12
and R-134a systems.
OPENS
CLOSES
Low Pressure Protection
22.5 ± 7.5 PSIG
40 Psig Maximum
( Descending Pressure )
( Rising Pressure )
High Pressure Protection
325 ± 25 PSIG
230 ± 20 PSIG
Shutter Fan/Override
35 - 60 PSIG
200 - 230 PSIG
Below Closing Pressure
( Rising Pressure )
ELECTRICAL
7 AMP Resistive
4 AMP Inductive
28 VOLT D.C. Maximum
2.50 Series Male Tab Terminals
TRINARY
™
E/C Connection end of TRINARY
TM
71R7500
RD-5-4585-0P
3
⁄
8
”- 24 UNF-2A
Male thread with bulkhead
seal, 2-012 O-Ring
Shutter/fan switch is
normally open
71R7550
RD-5-4583-0P
7
⁄
16
”- 20 UNF-2B
Female thread for
male Schrader
Shutter/fan switch is
normally open
MOUNTING CONFIGURATION
71R7600
RD-5-4620-0P
3
⁄
8
”- 24 UNF-2A
Male thread with bulkhead
seal, 2-012 O-Ring
Shutter/fan switch is
normally closed
71R7650
RD-5-4625-0P
7
⁄
16
”- 20 UNF-2B
Female thread for
male Schrader
Shutter/fan switch is
normally closed
Terminals 1 & 2
Controls Clutch High/Low Pressure
Protection
Terminal 1: To compressor clutch “compressor”
black wire
Terminal 2: To thermostat “AC/Thermostat”
black/white wire
Terminals 3 & 4
Controls Fan Clutch or Shutters
Terminal 3: To solenoid valve “override” yellow
wire
Terminal 4: To ignition “DC power” orange wire