Herrmidifier Herrmidicool - Manual (Page 13)

Herrmidicool IOS Manual
I n s t a l l a t i o n , O p e r a t i o n & S e r v i c e M a n u a l
13 www.herrmidifier-hvac.com
ALL SERIES
Troubleshooting without Fault Indication
A. Heavy Spray Pattern (Droplets too large) –
1. All heads – This is caused by incorrect air and water
pressure settings. Review settings and adjust as
required. Never allow air pressure to exceed the
water pressure.
2. Individual Heads – These heads are not getting
enough air for one of the following reasons:
a. Foreign matter may be clogging the screen (AH-
21) in the air strainer union of the head. Clean or
replace it.
b. One or more of the heads may have been
improperly adjusted or the individual shut-off
valve may be throttled. No valves should ever be
throttled. Readjust if necessary.
c. Water nozzle (AH-942) orifice may have been
enlarged due to bent cleaning needle. Replace
parts as required.
d. Air nozzle (AH-941) orifice may have been
enlarged due to improper cleaning or dirty air.
Replace part as required. Standard air orifice
sizes for the various heads are as follows.
6 lb/hr. – 0.95 mm
8 lb/hr. – 1.10 mm
10 lb/hr. – 1.15 mm
12 lb/hr. – 1.35 mm
15 lb/hr. – 1.45 mm
B. Spray Pattern too Light at Full Capacity – Check that the
AH-1109 digital display is reading 100%.
1. All heads – This is caused by incorrect air and water
pressure settings. Review settings and adjust as
required. Never allow air pressure to exceed the
water pressure.
2. Individual Heads – These heads are not getting
enough water for one of the following reasons:
a. One or more of the heads may have been
improperly adjusted or the individual shut-off
valve may be throttled. No valves should ever be
throttled.
b. Foreign matter may be restricting water flow in
the water nozzle (AH-942). Turn off the air and
water valves at the head. Remove the air nozzle
and water nozzle. Blow water nozzle with air. Do
not use wire or other hard object that will score
the inside of the nozzle.
C. Sputtering Heads – Air pressure at the atomizing heads
exceeds water pressure.
1. Adjust air and water pressures to correct operating
pressures.
2. Normally open drain solenoid on water control
section may have a malfunction allowing water to
leak into drain line during operation. Solenoid valve
seat may have foreign matter under the seat causing
it to leak. Solenoid may have defective seat.
D. Inoperative Heads-
1. All Heads-
a. The atomizing heads may be shutdown because
the system controls and setpoints are satisfied.
b. If the desired RH level has not been achieved,
check calibration of the controls and adjust as
required.
c. Air and water supply valves are not open.
d. No supply air pressure. If supply valves are open
and the gauges indicate no air pressure, check
compressed air source.
e. No power to the air and water solenoid valves.
Check controls and control cabinet fuses.
2. Individual Heads-
a. Be sure air and water valves to the atomizing
heads are open.
b. Possible defective parts inside atomizing head.
Shut-off air and water valves to the head and
remove head from the system. Disassemble and
examine internal parts. Repair and reassemble
as required. Rebuilding kits are available from
your local Herrmidifier representative. Perform
a complete restart and readjustment of the
atomizing head upon reassembly and repair.
E. Air Without Water – Be sure water valve to control section
is open. Check modulating water valve, water solenoid
and drain solenoid on water control section.