Hale CAFSPro - Manual (Page 43)

Operation ❑
43
CAFSPro User Operation Manual
p/n: 029-0020-75-0
WARNING !
CAFS SYSTEMS ADD POWER TO THE FIRE STREAM VIA COMPRESSED AIR.
PROPER EDUCATION, TRAINING AND NOZZLE SELECTION IS REQUIRED
FOR OPERATIONAL EFFECTIVENESS AND SAFETY. NOZZLE REACTION
GREATER THAN THAT OF PLAIN WATER IS TO BE EXPECTED.
Set Relief Valve
(See Figure 4-7: ‘Relief Valve Control.’)
1. When operating from draft, or the
apparatus booster tank, the engine
maintains correct speed for proper air
compressor operation.
2. When operating from a pressurized
water source it is necessary to set the
fire pump relief valve to maintain the
correct water discharge pressure of:
❑ 90-100 PSI (6 to 7 BAR)] for hand lines
❑ 125-150 PSI (9 to 10 BAR) for master
streams and proper engine speed for
air compressor operation.
3. With the master discharge pressure
gauge showing the correct discharge
pressure, set the Hale Total Pressure Master Relief Valve. Turn the han-
dle counterclockwise until the BLACK needle on the gauge drops and
the indicator on the relief valve nameplate lights.
4. Next, turn handle clockwise until the BLACK needle returns to the
required pressure setting and the indicator light turns OFF.
5. Turn the handle an additional half-turn clockwise. The valve is now
properly set.
6. Adjust the hand throttle to set the engine speed in the optimum range for
CAFS operation. Discharge pressure must remain at the present set-
ting.
7. Excessive intake pressures prevent achieving optimum engine speed
without excessive discharge pressures.
Figure 4-7: Relief Valve Control