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Model 7000 Flow Through Humidifier
10
HUMIDIFIER OPERATION
HUMIDIFIER CYCLE CONTROL
The HUMIDISENSE control is a temperature and time based
control designed to cycle the humidifier ON and OFF in
sequence with your furnace's cycles. As there are many different
homes and styles of furnaces the HUMIDISENSE control has 4
self contained adjustable temperature set points to control the
humidifier's cycles, as well there is a redundant control circuit
which with the use of a secondary control switch (sold separately)
can used to bypass the temperature control feature and cycle the
humidifier based on the furnace's fan cycle.
Depending on your furnace or other factors present in your home
(use of secondary supplemental heating, HVR's, ERV's, etc) it
may become necessary to change the setting of the control to
ensure the humidifier is shutting off when your furnace cycles off.
This is easily done by changing the dip switch (located on the side
of the Humidistat fig.30) positions, using a small screw driver.
Dip Switch
1. Determine that the humidifier is not shutting off when your
furnace shuts off.
2. Read the explanation of the different settings below and
determine which dip switch position you require.
3. The humidifier must be energized but NOT running in order
to change the dip switch position. If your humidifier has not shut
off after a furnace cycle, turn DOWN the furnace thermostat (so
the furnace shuts off and will not come back on). UNPLUG the
humidifier for a few minutes and allow the humidifier to cool
down, then plug the humidifier back in. Now the humidifier
should be plugged IN, the humidistat set in the highest position
(Automatic Operation – Dial Setting 7 / Manual Operation – Dial
Setting 45%), your furnace should be OFF, and the humidifier
should not be running (Green LED OFF).
4. With the furnace OFF, Change the dip switch position to the
desired setting.
5. AFTER you have change the dip switch setting UNPLUG the
humidifier for 1 minute.
6. After the humidifier has been unplugged for 1 MINUTE, Plug
the humidifier back in and WAIT ANOTHER MINUTE.
7. The control set point has now been changed. Turn UP the
furnace thermostat and check the humidifier's operations.
CONTROL SETTINGS
FACTORY SETTING – Fig 31
The control comes from the factory set with the
criteria indicated below.
Humidifier ON: A temperature rise of 4˚C in
Figure 31
one minute and a temperature greater than
Factory setting
30˚C
45 ∞C OFF
NOTE – ONLY CHANGE THE
SETTINGS IF REQUIRED.
YOU
MUST
CAREFULLY
FOLLOW THE FOLLOWING
STEPS
TO
CHANGE
CONTROL'S SET POINT:
Humidifier OFF: A temperature drop of 2˚C in one minute and
a temperature less than 45˚C
• This setting will meet the requirements of 85% of the furnace's
in the market today. It will provide the required humidifier
control on furnaces ranging from high to low efficiency. You
should only change this setting IF REQUIRED.
OPTIONAL SETTING #1 – Fig 32
The control comes from the factory set with the criteria indicated
below.
Humidifier ON: A temperature rise of 4˚C in one
minute and a temperature greater than 30˚C
Humidifier OFF: A temperature drop of 2˚C in
one minute and a temperature less than 35˚C
• This setting will be useful when you find that the
Figure 32
35 ∞C OFF
humidifier is shutting off too early or in the middle
of a furnace cycle. If your furnace is multi-speed
(the furnace fan will change speeds during the heating cycle) or if
you have a high efficiency furnace, where the furnace burner will
cycle ON and OFF during the heating cycle in order to save energy.
OPTIONAL SETTING #2 – Fig 33
THE
The control comes from the factory set with the criteria indicated
below.
Humidifier ON: A temperature rise of 4˚C in one minute and a
temperature greater than 30˚C
Humidifier OFF: A temperature drop of 2˚C in one minute and a
temperature less than 55˚C
• This setting will be useful when you find that the
humidifier is not turning off when your furnace has
cycled off. Typically this will occur because the
furnace's cool down cycle is short and the furnace is
shutting off when there is still hot air circulating
through the ducts. As well this will be seen when the
Figure 33
furnace is located in an enclosed space and as a
55 ∞C OFF
result the ambient temperature is high.
OPTIONAL SETTING #3 – Fig 34
The control comes from the factory set with the criteria indicated
below.
Humidifier ON: A temperature rise of 4˚C in one minute and a
temperature greater than 30˚C
Humidifier OFF: A temperature drop of 2˚C in
one minute and a temperature less than 65˚C
• This setting will be useful when option # 2
(55˚C) does not work. You will find this when a
furnace does not have a cool down cycle at all, on
Figure 34
65 ∞C OFF
older model furnaces. This could be occurring
when the furnace is older and has short off cycles
or if the furnace is located in a tight enclosed space and the
ambient temperature is very high.
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