18
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
(VAPORMIST models)
Use cold or hot makeup water. If the water pressure
is above 60 psi (415 kPa) and/or water hammer
would be objectionable, install a pressure-reducing
valve or shock arrester. Even though the
VAPORMIST has an internal 1" (25 mm) air gap,
some local codes may require backflow prevention.
Important: Minimum water supply pressure
is 25 psi (175 kPa).
• DI makeup water piping
(VAPORMIST 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.
VAPORMIST
®
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 local codes and the
VAPORMIST 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 21 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 VAPORMIST 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.pdf 18 11/19/2009 9:51:32 AM
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