Graco 246781 Heat Pump User Manual


 
Operation
6 309966J
Operation
Pressure Relief Procedure
The equipment stays pressurized until pressure is man-
ually relieved. To reduce the risk of serious injury from
pressurized fluid, fluid from the valve, or splashing fluid,
follow this procedure whenever you:
are instructed to relieve pressure
stop dispensing
check, clean, or service any system equipment
install or clean dispensing devices.
1. Close the pump air regulator and the bleed–type
master air valve (required in your system).
2. Hold a metal part of the dispensing valve firmly to a
grounded metal waste container and trigger the
valve to relieve the fluid pressure.
Startup
1. If there are multiple pumps on the air line, close the
air regulators and bleed–type master air valves to all
but one pump. If there is only one pump, close its air
regulator and bleed–type master air valve.
2. Open the master air valve from the compressor.
3. Open the dispensing valve into a grounded metal
waste container, making firm metal–to–metal con-
tact between the container and valve. Open the
bleed–type master air valve and open the pump air
regulator slowly, just until the pump is running.
When the pump is primed and all air has been
pushed out of the lines, close the dispense valve.
4. If you have more than one pump, repeat this proce-
dure for each pump.
5. Set the air pressure to each pump at the lowest
pressure needed to get the desired results.
6. Never allow the pump to run dry of the material
being pumped.
7. Read and follow the instructions supplied with each
component in your system.
8. To shut off the system, always follow the Pressure
Relief Procedure.
When the pump is primed, and with sufficient air
supplied, the pump starts when the dispensing
valve is opened and shuts off when it is closed.
The pump has a rated ratio of 50:1. However, it is
capable of reaching stall pressures equal to 60
times the air input pressure. Calculate the fluid out-
put pressure using the air regulator reading. Multi-
ply the air pressure shown on the regulator gauge
by 60. For example:
140 psi air x 60 = 8400 psi fluid output)
(0.97 MPa air = 58.2 MPa fluid output
99.7 bar air x 60 = 582 bar fluid output
Regulate air to the pump so that no air line or fluid
line component or accessory is overpressurized.
CAUTION
A dry pump will quickly accelerate to a high speed,
possibly damaging itself. If your pump accelerates
quickly, or is running too fast, stop it immediately and
check the material supply. If the supply container is
empty and air has been pumped into the lines, prime
the pump and lines with material, or flush it and leave
it filled with a compatible solvent. Be sure to eliminate
all air from the material lines.
A pump runaway valve can be installed on the air
line to automatically shut off the pump if it starts to
run too fast.