Bacharach | THE MEASURABLE DIFFERENCE | New Kensington, PA, USA | Dublin, Ireland | Toronto, Canada | mybacharach.com
3. If Pressure, Vacuum, are equal to Ambient, 14.xx to (12.xx if you are in Denver).
Then there are three possibilities;
a) The pump is not pumping.
i. Note
:
the pump works on a volume / differential pressure and cannot
be verified by putting your finger over the end to see if it’s working.
b)
There is a hose off of a connection
c)
The Manifolds are stuck open; this could be a result of dirt inside the manifold
holding a valve open mechanically. It could also be a result of a failed manifold
control board, holding the solenoids on the manifolds open electrically. (see next
section on troubleshooting a Manifold control board failure)
Troubleshooting a suspected Manifold control board failure
If the fault code is an 800 or 1800 it could be due to a manifold control board failure.
After checking to make sure the pump is functioning properly the follow procedure
should be used to check the control board.
The symptoms are: during normal sampling mode the Pressure value and the ambient
value are equal or very close to equal at sea level they would be 14.xx PSIA. The
pressure is the live number with the Vacuum and Ambient values being stored for
reference during a purge and pressure check cycle. A good way to verify that the
manifold control board has failed electrically and is holding 2 or more solenoids open is
power down the monitor first,
and then disconnect (unplug) all the solenoids from the
board. Then power the monitor up and If the Pressure goes to maximum Vacuum
(somewhere between 10.8 and 11.2) with all the manifolds disconnected then you know
it’s an electrical failure of the manifold control board. If the values stay equal at ambient
pressures then you know it’s a mechanical failure from dirt or moisture holding the
valves open.
Do not reconnect the manifolds with the power on.
REZERO VOLT TOL (4000) –
1.
The detector output voltage is out of tolerance.
(see HGMMZ voltage adjustment
in the annual maintenance guide or the HGMMZ voltage adjustment bulletin)
OVER RANGE DETECTED (2000) –
1. This indicates the measured concentration on one or more zones exceeds the
measurement range.
2. Has the monitor been exposed to pure refrigerant? If not check the sensor
voltage range.
