USER MANUAL
Series HC
Reference No. 145 Final Rev 5
Page 45
September 2004
SECTION 6:
(Continued)
6.5
SECONDARY DRAIN FAILURE
6.5.1
Solenoid Valve Failure
When the liquid level rises above the primary float valve elevation and contacts
the liquid level probe, a circuit is completed energizing the 3-way normally open
solenoid valve depressurizing the secondary drain valve actuator. The system
pressure should open the secondary drain valve. If the PRIMARY DRAIN
FAILURE ALARM activates, but the secondary drain valve fails to open, check
the 3-way normally open solenoid valve. Clean, repair, or replace as necessary.
6.5.2
Liquid Level Probe Failure
If the PRIMARY DRAIN FAILURE ALARM does not activate after or during
failure of the float operated drain, check the liquid level probe for proper
operation.
6.6
SHORT-TERM
SHUT-DOWN
Advice
The following sequence is to be heeded when switching off the
adsorption dryer:
•
First close all the shut off valves up and downstream of dryer
•
Then immediately switch off the adsorption dryer.
Attention!
Dryer will remain pressurized.
6.7
SHUT-DOWN IN CASE OF A FAULT OR FOR MAINTENANCE
Danger!
Before any kind of maintenance or repair work is
done, the adsorption dryer must be depressurized
and disconnected from the power source.
Apply the general safety regulations!
