Bird Technologies 8921SC13-Manual - Manual (Page 16)

Bird 8920 Series Semiconductor Termaline Coaxial Load Resistor
6
Installing
Thermoswitch
Bird 8920 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 @ 120 Vac and 5A @ 230 Vac.
To install or replace the thermoswitch:
1. Remove the vent plugs. Install the shipping plugs.
2. Stand the unit on its front, supporting it so that the connector is
not damaged. 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, using
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.
6. Remove the shipping plugs. Install the vent plugs.
WARNING
BOTH vent plugs 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.