Bird 8890 Series Semiconductor Termaline Coaxial Load Resistor
6
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.
To install or replace a thermoswitch, follow these instructions:
1. Remove the vent plug and install the shipping plug.
2. Stand the unit on its back with the connector end up. In this
position there is no danger of the coolant pouring out through the
socket plug hole.
3. Remove the socket plug just above the connector assembly with a
9
⁄
16
" hex wrench.
4. Replace the plug with the thermoswitch. Sparingly apply pipe
sealing compound to the external threads, only, of the
thermoswitch. Do not contaminate the coolant with pipe sealant.
5. Check for coolant leaks upon completion.
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.
