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Due to the wide range of water conditions found
throughout North America it is important that the
A
blowdown is set according to the local water
f,
conditions. By water conditions we are referring to the
hardness of the water supplied to the humidifier. The
hardness is measured in grains per gallon. It is also
important to test for silica content. Silicates may cause
foaming and contribute to scale buildup in the
humidifier tank and float chamber. When excessive
foaming occurs, an optional foam separator is
available from NORTEC.
If you are unaware of the hardness or silica
content of your water supply, there are many "do it
yourself' kits which can be purchased, or there are
several companies that will perform the tests for a
reasonable price. You can even contact your
municipality for your water condition.
It is possible to reduce this setting according to
observation and guidelines in the tables above. Also,
when high silica content has been identified, the
humidifier tank and float chamber will require
increased maintenance and the blowdown setting
should be increased to maximum setting. In this case
silica content may determine the appropriate
blowdown setting.
<\
OUTDOOR ENCLOSURE HEATER
.)
SETTING
Position #1 on the heater will maintain the air
around the heater at around 60 deg.F. Each increment
changes the set-point by an additional 16°F. The off
position can be obtained by turning the knob counter
clockwise. The set-point position is at the
3
O'clock.
MANUAL STEAM OUTPUT ADJUSTMENT
B
Models
Manual rate adjustment for GHB units is
accomplished by rotating the output adjustment
selector that is located on the switch panel behind the
locked door panel. Rotate the knob labeled "Outpuf'
clockwise to increase output and counter clockwise to
decrease output. See specifications for output values.
GHMC DISPLAY OPERATION
Refer to the GHMC Display Unit Operating
Instructions, Form XX-274, for information on
programming and operating the display unit.
START UP PROCEDURE
Also see Startup Sheet on page 21.
- 17 -
Prior to filling the unit, it is necessary to ensure
that no dirt or dust has accumulated in the control
compartment. If necessary, clean this area to prevent
contaminants from being drawn into the combustion
blower. All water, gas, electrical and venting
connections must be properly completed and tested
before commissioning the unit.
FILLING THE SYSTEM
Before the GH unit will initiate combustion it must
be filled with water to the low level setting of the water
level controller. (Refer to water level control). To fill
with water, turn the gas supply off and switch the unit
on at the power switch. The unit will fill automatically
until the low water level is reached and then trial for
ignition will begin. After three tries the ignition
module(s) will lock-out. Leave the unit switched on
until the fill sequence is complete. Then switch off the
power and proceed with the ignition safety shut-off
test.
TESTING THE IGNITION SAFETY SHUT-OFF
The ignition system safety shut-off must be tested
by conducting the following method of test:
1.
With the gas supply off, turn power on.
2.
Blower pre-purges for 30 seconds .
NOTE: On mUlti-blower models, it is
necessary to wait for all blowers to cycle.
3. After seven seconds the gas valve is
energized for four seconds, then de-energized.
After three trials for ignition (complete with
pre-purge) the unit goes into a safety lockout.
4.
Manually re-open the gas supply. No gas
should flow to the main burner. End of test.
5.
To reset the system, momentarily shut off
power switch, then turn it back on again. After
a pre-purge the igniter will start to heat up and
normal operating cycle will occur as described
in the IGNITION SEQUENCE.
SAFETY INSTRUCTIONS
Refer to front cover and page 1 of this guide.
MAINTENANCE
Please also refer to Maintenance schedule on
page 23.
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