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7
Oper
ating the Fr
ee-Air Pump
a) Close the dump valve
by turning the red knob
clockwise until no air can
escape (Figure 9).
NOTE
The dump valve provides a
course pressure adjustment
and may have to be used if
the respirator’s approved
pressure is below 10 psig.
If so, you will also have to simultaneously use the pressure relief
valve on the pod(s) to obtain the exact pressure required.
b) Close the pressure relief valve on the pump’s manifold. Loosen
the lock nut on the relief valve and adjust the flow control knob
downward (clock wise) until no air can bleed off at the manifold
(Figure 10).
c) Use the pressure relief valve located on the pod(s) to set the
pump’s outlet pressure. The relief valve can be adjusted by
loosening the lock nut and adjusting the flow control knob until
the desired outlet pressure has been obtained. Retighten the
lock nut firmly to maintain a consistent flow (Figure 11).
The pressure on the gauge at the air supply hose pod must
be monitored regularly to assure it is maintained within the
respirator’s approved pressure range.
10. If the flow of air dumped from the relief valve on the pod(s)
creates a problem in the work area, use the relief valve on the
manifold as the pressure adjustment valve.
a) Close the relief valve on the pod(s) by adjusting flow control
knobs and retightening the lock nut(s) to prevent air from
bleeding at the pod(s).
b) Adjust the flow control knob on the manifold until the desired
outlet pressure has been obtained and retighten the lock nut
firmly to maintain a consistent flow.
c) Even if you use the manifold relief valve to adjust the outlet
pressure, the pressure must still be monitored at the pres-
sure gauge on the pod(s) to assure it is maintained within the
respirator’s approved pressure range.
Pressure Gauges
The pump has two pressure gauge locations (depending on pump model):
- One on the pump’s manifold
- One on each pod
The pressure gauge located on the pod(s) must be used as the gauge
to monitor the outlet pressure supplied to the respirators.
NOTE
If the pod(s) are attached directly to the pump manifold, the
pressure gauges should always read /- 5% of each
other. If the gauge on the manifold reads substantially higher
than the gauge on the pod, the outlet filter cartridges may be
clogged resulting in restricted air flow to the respirators.
If this occurs, we recommend the outlet filter cartridges be
replaced. See the maintenance section on page 8 for
information on replacing the outlet filter cartridges.
If the pod(s) are attached to the end of the V60 extension hose, the
pressure difference between the manifold and pod(s) will be approxi-
mately 1 psig per 100 feet of V60 hose.
11. YOU ARE NOW READY TO ENTER THE WORK AREA.
If you are locating the pod(s) in a remote location from the pump
see instruction 2 in Assembling The Free-Air Pump section on
page 4. Make sure they are placed in an area away from other
equipment or machinery.
The pod(s) must be protected from any equipment that could run
over, bump or damage it and cause a cut off of air flow to the
respirators.
12. When finished working, leave the work area wearing the
respirator and with the air still flowing. Once outside the
contaminated area, remove the respirator, then disconnect the air
supply hose from the respirator’s quick-disconnect coupler.
See your respirator manufacturer’s instruction manual for proper
Inspection, Maintenance and Storage procedures.
Frigitron 2000 Cool Tube
Bullard’s FRIGITRON 2000 cool tube can be used in conjunction with
certain MSHA/NIOSH approved Bullard hood style respirators when
using the EDP30 Free-Air Pump.
The FRIGITRON 2000 and EDP30 pump will supply two (2) people
working in hot or humid areas with a continuous flow of cool air. The
cool tube will cool the incoming air into the respirator hood approxi-
mately 20-22 degrees below the ambient air temperature.
Pump Model EDP50 cannot be used to supply air to a respirator with
the Frigitron 2000 because it does not produce enough outlet pres-
sure to drive the cool tube.
For complete information on specifications and performance of the
FRIGITRON 2000 refer to the Bullard respirator product literature and
instructions.
Free-Air® Pumps
User Manual
Figure 11
Figure 10
Figure 9
