PRESSURE SWITCH/SAFETY SWITCH (SINGLE SWITCH)
Remove the dust cover on the pressure
switch and attach wiring harness to
electrical connections. If properly installed,
it will not allow the compressor to engage if
too little or too much refrigerant.
Pressure switch is a compressor safety
switch designed to save the compressor
from failure due to too low or too high of
pressure in the system.
HI/LOW
PRESSURE
SWITCH
FROM
THERMOSTAT
FROM 12V
IGN SOURCE
NOT USED
12V
RELAY
IN
OUT
wiring harness
pressure switch
drier
bracket
28 PSI - 380 PSI
LOW
HIGH
RED 0-27 PSI
GREEN 28-380 PSI
RED
OPEN (OFF)
CLOSED (ON)
OPEN (OFF)
381+ PSI
PRESSURE SWITCH
TRINARY SWITCH (DUAL SWITCH)
Trinary switches combine low and high
pressure compressor clutch cut-off
functions plus an electric fan engagement
signal at 254 psi.
trinary
switch
drier
bracket
RED 0-27 PSI
GREEN 28-380 PSI
RED
OPEN (OFF)
CLOSED (ON)
OPEN (OFF)
381+ PSI
PRESSURE SWITCH
COMPRESSOR FUNCTION
RED 0-253 PSI
GREEN 254+ PSI
OPEN (OFF)
CLOSED (ON)
PRESSURE SWITCH
ELECTRIC FAN FUNCTION
RELAY NOT SUPPLIED - PURCHASED SEPARATELY
TRINARY
SWITCH
ELECTRIC
FAN
GROUND
(-)
FAN (+)
GROUND
(-)
IGN SRC (+)
BATTERY FUSED (+)
COMPRESSOR
O-RINGS
• Use 2 wrenches to tighten fittings.
• Do not over tighten.
• Use a few drops of mineral oil with every o-ring.
• Crushing or ripping an o-ring will create a small leak very
difficult to locate.
When installing o-rings on the hose connections, be certain
the o-ring is properly sealed. Also check for sharp edges on
the seat. If installed wrong, or the seat has a sharp burr, the
o-ring can be cut.
Use the o-ring pack supplied. Not all sizes and quantities
will be used.
When removing caps, pressure will release. Do NOT leave drier open to air longer than
a couple minutes.
• Insert the drier into the drier mounting bracket
• Attach the drier liquid tube to the “IN” port on drier and to the connection on the
condenser
• Attach drier to condenser
DRIER
To lower/small
connection of
condenser
To evaporator
IN
OUT
P A G E
0 5
Summary of Contents for FIREBIRD TRUMOD 1969
Page 1: ...1969 FIREBIRD INSTALL MANUAL 2020 RESTOMOD AIR...
Page 8: ......
