10
Introduction
After the system has been properly installed and connected
to both electrical and water supplies, it may then be started.
Start-up and checkout procedures
Mounting
Check mounting to see 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)
Use cold or hot makeup water. If the water pressure is
above 60 psi (414 kPa) and/or water hammer would be
objectionable, a pressure-reducing valve or shock
arrester should be installed. Even though the VAPORMIST
has an internal 1" (25 mm) air gap, some local codes
may require a vacuum breaker.
Important:
Minimum
water supply pressure is 25 psi (172 kPa).
•
DI makeup water piping
(VAPORMIST DI)
In this unit the electronic probe control is replaced by a
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.
Electrical
Verify that all wiring connections have been made in
accordance with all governing codes and the enclosed
VAPORMIST
®
wiring diagram. The external connections
diagram will be found with this manual.
Caution: Only qualified electrical personnel should
perform start-up procedure.
A three-probe conductivity
sensor cycles a solenoid-
operated water fill valve to
maintain the proper water
levels.
VAPOR-LOGIC
®
3
control
VAPOR-LOGIC
3
is the
standard controller for
the VAPORMIST.
For more information
regarding the operation
of the VAPOR-LOGIC
3
microprocessor, see
the VAPOR-LOGIC
3
Installation and Operation
manual.
START-UP AND OPERATION
Control system start-up/checkout
1.
Confirm that proper grounding and an approved earth
ground are provided.
2.
Confirm that the control signal being connected to
the VAPOR-LOGIC
3
system is compatible with
the VAPOR-LOGIC
3
program. Identify the
VAPOR-LOGIC
3
program code on the wiring diagram.
Refer to the VAPOR-LOGIC
3
manual to decipher the
code using the nomenclature description.
3.
Confirm all wiring is correct per wiring diagram.
4.
Confirm J17, J18 and J19 shunt connectors on
VAPOR-LOGIC
3
board are in their correct position per
wiring diagram. See Page 3 of the VAPOR-LOGIC
3
manual for the physical locations.
5.
Confirm that the keypad is mounted on the
VAPORMIST with modular cable routed away from
high voltage circuits and connected to J2 female
connector on the control board.
6.
Turn on water supply. Confirm drain valve is closed.
7.
Turn on power. The keypad will display the introduction
of VAPOR-LOGIC
3
and will then enter AUTO mode.
8.
System will initiate filling of the tank with water. The
keypad will display "Filling" as part of the idle
screen information.
9.
Airflow switch input must be closed.
10. High limit humidistat input must be closed or variable
air volume (VAV) control system high limit transmitter
must be connected.
11. Sufficient water in the tank, air flow switch closed,
high limit humidistat closed, door interlock circuit
(optional) closed and a call for humidity will activate
the heat output.
If the tank does not contain
water and the heat output is activated by the
VAPOR-LOGIC
3
control system, a serious failure
will result. Immediately remove power from the
system and verify that all wiring has been com-
pleted per the wiring instructions in the manual
and the unit wiring diagram.
12. During normal operation, the keypad will display
humidifier operating status. See the VAPOR-LOGIC
3
manual for descriptions to change any of the operat-
ing parameters.
Fill valve
Figure 10-1
:
Electronic probe
control for maintaining proper
water level (standard water
Fill valve on
Low water
VMOM-0600.PDF 10
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