Bird Technologies 8920 Series - Manual (Page 16)

6
Setup
Note: Before first using the load, get a resistance baseline for future maintenance. Refer to "DC Resistance"
on page 12 for details.
1. Remove the shipping plug.
2. Install the vent plug. Refer to Figure 2 and Figure 3.
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.
1. Stand the unit on its front, supporting it so that the connector is not damaged.
Note: In this position there is no danger of the coolant pouring out through
the socket plug hole.
2. Remove the socket plug just above the connector assembly, using a
9 ⁄
16
" hex wrench.
3. Replace the plug with the thermoswitch.
4. Apply pipe sealing compound, sparingly, to the external threads, only, of the thermo-
switch.
5. Check for coolant leaks upon completion.
6. Remove the shipping plug. Install the vent plug.
Interlock Connection
Note: Connect the thermoswitch to the interlock as follows (see Figure 4):
1. Unscrew the large knurled ring-nut (A) at the lower end of the coupling jack assembly.
2. Pull it off the thermoswitch jack (B).
3. Unscrew the small knurled cover fitting from the base plug (D) of the connector to
release the base.
4. Thread the control switch wires through the clamp (E) with the washers (F) inside
and with its threaded fitting in place.
5. Service the control switch wire with short tips and put spaghetti sleeves over the
wire ends if necessary.
6. Securely solder the control switch leads to the lugs (G) of the connector base.
Note: The ring-nut (A) must be in place over the base plug (D) with the knurled
end facing out.
7. Screw on the cover ring, then fasten the cable clamp (E) in place and tighten both
yoke screws (H).
8. Put the plug back on the thermoswitch and tighten the nut (A).
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.
CAUTION
If installed, connect optional interlock before applying RF power.