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WS-93002N page 2 of 7
INSTALLATION INFORMATION continued
Connecting High Temperature
Swichgage instrument
LIQUID COOLED ENGINES:
1. Drain engine coolant to a level below the temperature sensing con-
nection/plug. This connection is on the engine side of the thermostat
generally near the thermostat housing. Consult your engine manual.
2. Remove adapter nut from temperature sensing bulb and union nut.
3. Apply a non-hardening thread sealant to the adapter nut and screw
securely into the water jacket opening on the engine.
4. Route the temperature capillary away from hot surfaces such as
exhaust manifolds.
5. Place the sensing bulb into the adapter nut and observe that the sens-
ing bulb does not “bottom” in the water jacket nor are there other
obstructions in the water jacket opening. Secure sensing bulb into
the adapter nut with the
5
/8-18 union nut. See mounting detail below.
6. Coil excess temperature capillary into a 2 in. (51 mm) diameter
minimum coil. Tie the coil to prevent excessive movement.
Sensing Bulb Mounting Detail
AIR COOLED ENGINES:
Temperature for air cooled engine can be measured in the cylinder head or
in the lubricating oil. Oil temperature will give a more uniform reading
than cylinder head since the oil circulates throughout the engine. Refer to
specific instructions supplied, if any, for your specific application.
1. Oil Temperature
a. The Swichgage sensing probe must be fully immersed in the oil
pan, oil filter housing, oil cooler, etc. depending on engine
model and configuration.
b. Observe all precautions for liquid cooled engines.
2. Cylinder Head Temperature
a. Generally the cylinder head must already have a hole drilled
and tapped for insertion of the temperature sensing probe.
b. If a hole is not provided in the cylinder head and no provision
is made to drill and tap one, it may be possible to install an
external bolt on heat sink such as the Murphy HS7.
c. Coat the temperature sensing probe with a high temperature
grease. A mixture of silicone and graphite flakes is recom-
mended although grease alone can be used.
d. Observe all precautions for liquid cooled engines.
Installing the Engine Stop Device or Alarm
Follow instructions provided with the stop device or alarm.
Electric Wiring
1. Disconnect the battery ground cable or otherwise disconnect
electric power from the engine and panel.
2. See the appropriate typical or specific wiring diagram for the nerve
center/magnetic switch in your panel.
3. Generally you will only be required to wire the battery or other electri-
cal power to the nerve center/magnetic switch and the output circuit
from the nerve center/magnetic switch to the alarm or shutdown device.
4. Ammeters should be direct wired according to the wiring included
with this panel. Use minimum 10 AWG cable.
5. Be sure that the connected load(s) does not exceed the voltage and
current ratings of the nerve center/magnetic switch or Swichgage.
Placing Into Operation
1. Refill oil and coolant to proper levels.
2. Reconnect electrical power.
3. Service the engine as required by the engine manufacturer before
attempting to start the engine.
To Start the Engine
1. Fully depress the red or black push button of the nerve center/mag-
netic switch on the panel face. Hold in the button while cranking the
engine. This overrides the engine shutdown to allow starting. When
the oil pressure pointer moves away from the pointer contact (or
when pressure exceeds the preset low trip point) release the push
button. The engine should be operating. If the push button is red, it
should remain depressed. If the push button is black, it should
return to an extended position.
2. Allow the engine to warm up and the thermostat to open. Slightly
loosen the
5
/8-18 union nut on the temperature sensing bulb to allow
trapped air to escape from the cooling system. Retighten the nut.
3. Loosen the oil line fitting slightly at the pressure Swichgage to
allow trapped air to escape from the tubing. Retighten the fitting.
To Stop the Engine
1. Return the engine to idle speed and unload any driven equipment.
2. DISTRIBUTOR IGNITION engine panels may have an
Emergency Stop Button, a start key switch or other power on/off
switch. Operate that switch or button. The nerve center/Magnetic
Switch will trip and open the ignition circuit to stop the engine.
3. DIESEL ENGINES may be equipped with “energized to RUN” or
“energized to STOP” devices. For “energized to RUN” devices such
as Murphy SV series fuel valves or RP-type solenoids, operation is
identical to above for distributor ignition engines. The “energized to
RUN” device is de-energized and the engine stops. For “energized
to STOP” devices the nerve center/magnetic switch applies battery
power to the stop device. Power is removed after a short time delay
depending on the specific nerve center/magnetic switch.
See instructions supplied with the shutdown or alarm device.
For normal stop, pull the manual stop cable.
capillary
sensing
bulb
insertion
union
nut
Sensing
bulb
engine block
adapter
nut
coolant
flow
CAUTION: Do NOT cut or bend the temperature capillary at a
sharp angle. Excess capillary must be carefully coiled and
secured. The temperature sensing bulb must be immersed
directly into the water jacket flow to sense coolant temperature. Do NOT
install into a tee or other fitting. Use only Murphy adapter nuts.
CAUTION: If the pressure Swichgage is equipped with a face mounted
lockout push button, be sure that pressure has been established and
that the lockout mechanism has disengaged. Failure to disengage will
prevent the Swichgage control from operating on low pressure.
WARNING: Perform this operation using appropriate protection.
Trapped air and coolant may cause skin burns.
CAUTION: You should stop the engine in a normal manner.
Turn off the power switch, pull shutoff cable, etc. Do NOT use
the Swichgage control instrument as a normal shutoff.
CAUTION: Never check for voltage by shorting a wire or terminal to
ground. This will ALWAYS damage the electrical components.
CAUTION: Do NOT apply too much grease. If grease is pushed out of
the hole when temperature probe is inserted, remove some grease.
CAUTION: The Swichgage contacts are “pilot duty”. Generally a
nerve center/magnetic switch or relay is required between the
Swichgage contacts and the shutdown or alarm device. Failure to
use a nerve center/magnetic switch will result in contact failure in
the Swichgage and failure of the shutdown or alarm device to operate.