User's Manual

Component Descriptions

September 2013 2-28 P/N 81-CO2MAN-001

Figure 2-32. Electric Control Head (Cover Removed)

2-3.4.2 ELECTRIC AND CABLE-OPERATED CONTROL HEADS

These control heads (Figure 2-33) provide for electric, local manual and remote manual

actuation of the CO

cylinder valve or directional (stop) valve. The control head is operated

electrically by a suppression control panel or mechanically by a cable pull box. it is also

equipped with a lever for local manual operation.

These heads contain a microswitch whose contacts are used to break the electrical circuit to

the solenoid when the head is actuated. This reduces the overall power consumption of the fire

suppression system. The actuating pin latches in the released position and must be

mechanically reset.

A suitable suppression control panel, specifically listed and/or approved for use with the

following control heads shall be provided for supervision of the releasing circuits per NFPA

requirements. In addition, a 24 hour back-up power source shall be provided per NFPA

requirements. Electrical data is contained in Table 2-9.

Table 2-8. Electric Control Head

Control Head Part Number Voltage Amps.

WK-890181-000 24 Vdc 2.0 momentary

3/4 in. NPT TO FLEXIBLE

CONDUIT ADAPTER

PLUS OR HOT CONNECTION

(TERMINAL #3)

TERMINAL STRIP

MICROSWITCH

MICROSWITCH LEVER

INDICATOR AND

RESET STEM

CAM

SWIVEL NUT

MINUS, NEUTRAL, OR

GROUND CONNECTION

(TERMINAL #1)

OPTIONAL CONNECTION

FOR MICROSWITCH

(TERMINAL #2)

FLEXIBLE

CONDUIT