Termaline® Semiconductor Load Resistor
4
Installing Thermoswitch
Bird 8890 series loads can be equipped with an optional interlock thermoswitch, P/N 8890-008. It is normally
closed, opening at 236 °C (457 °F), with a rating of 10A @ 120VAC and 5A @ 230VAC.
1.
Remove the vent plug.
2.
Install the shipping plug.
3.
Stand the unit on its back with the connector end up.
Note:
In this position there is no danger of the coolant pouring out through the socket plug hole.
4.
Remove the socket plug just above the connector assembly with a
9
16
" hex wrench.
5.
Replace the plug with the thermoswitch.
6.
Apply pipe sealing compound, sparingly, to the external threads of the thermoswitch, only.
7.
Check for coolant leaks upon completion. See
WARNING
The vent plug must be used at all times when the unit is operating or cooling. Failure
to do so could result in an explosion or severe burns.
CAUTION
Do not contaminate the coolant with pipe sealant.
