19
Introduction
After the system has been properly installed and
connected to both electrical and water supplies, it
may be started.
Start-up and checkout procedures
Mounting
Check mounting to verify that the unit is level and
securely supported before filling with water.
Piping
Verify that all piping connections have been
completed as recommended and that water
pressure is available.
•
Standard makeup water piping
(HUMIDI-TECH models)
Use cold or hot makeup water. If the water
pressure is above 415 kPa and/or water hammer
would be objectionable, install a pressure-
reducing valve or shock arrester. Even though the
HUMIDI-TECH has an internal 25 mm air gap,
governing codes may require backflow
prevention.
Important:
Minimum water supply pressure
is 175 kPa.
•
DI makeup water piping
(HUMIDI-TECH DI models)
In this unit the electronic probe control is replaced
by float valve control. A float switch provides
heater protection in the event of a low-water
condition and is common to all DI humidifiers.
The wiring diagram is located inside the electrical
panel cover.
HUMIDI-TECH
®
START-UP AND OPERATION
Electrical
Verify electrical connections before start-up.
Do not remove the electrical panel cover or
heater terminal cover until electrical power is
disconnected. Safety first.
• Verify that all wiring connections have been
made in accordance with all governing codes
and the HUMIDI-TECH wiring diagram. The
external connections diagram will be found in the
packet with this manual.
• Verify that all DIN rail-mounted components are
securely fastened to DIN rail.
• Verify that all power terminal screws and lugs
are tight from power block to heaters. See the
table on Page 22 for torque specifications.
• Verify that all plugs located under the humidifier
cover are completely plugged in.
CAUTION: Only qualified electrical
personnel should perform start-up
procedure.
Electronic probe control
(standard water HUMIDI-TECH models only)
A three-probe conductivity sensor cycles a
solenoid-operated water fill valve to maintain
proper water levels.
OM-211-3
Fill valve on
Fill valve off
Low water
VM99-C-0302-M-0302.pdf 19
11/19/2009 9:51:09 AM