Parts And Accessories; How The Humidifier Works - Honeywell Home HM750A1000 Instructions D'installation

Parts and Accessories

The following parts and accessories are available and may have been included with your HM750 humidifier. The cylinder
is the only item that will need periodic replacement to maintain proper humidifier operation.
Replacement Cylinder
HumidiPRO Humidistat
Drain and Fill Valve Kit
Remote and Duct Nozzle Kit
Replacement PC Board
15 ft. Steam Hose Kit
Differential Pressure Switch for Air Proving

How the Humidifier Works

The HM750 is an atmospheric steam generator that uses
heat generated by electrical current flowing between
submerged electrodes to generate steam. The HM750 is
designed for on-demand air humidification via a steam
distributor nozzle.
STEAM GENERATION
• Once the humidistat terminals and the air proving
terminals are closed (AP on the control board), the
humidifier closes the power relay and measures the
electrical current.
• If current is lower than full load amperage, after a brief
delay the water fill valve will be activated and water will
flow into the fill cup. Water from the fill cup flows into
the bottom of the cylinder through a hose connected to
the drain valve housing.
NOTE: The cylinder is gravity fed from the fill cup. If
backpressure from the steam line is too high it
will cause water to back up in the fill cup and flow
down the overflow line to the drain.
• As soon as the water in the cylinder comes in contact
with the energized electrodes, current flows through
the water. The resistance of the water to the electrical
current generates heat and in turn steam. The electrical
current (and steam output) increases as the level of
water increases, as more of the electrode becomes
submerged. The unit continues to fill until the current
reaches full load amperage, or the high water sensor
detects a high water level.
• The water level and current draw in the cylinder
decreases from evaporation (through steam
generation).
• If the high water sensor was activated before full load
amperage is achieved, the water will boil down until the
high water sensor is no longer activated. If full load
amperage was achieved, the water will boil down to a
predefined amperage.
• The HM750 repeats the fill and boil down cycle
repeatedly to provide a constant steam output.
• Over time, minerals in the water will adhere to the
cylinder electrodes. The humidifier will automatically
fill to a higher water level to maintain full capacity
during the life of the cylinder. Eventually, because of
Table 2. Parts and accessories.
Part/Accessory Part Number
HM750ACYL
H6062A1000
HM750AVKIT
HM750ANKIT
HM750APCB
HM750AHOSEKIT
50027910-001
scale formation, it will no longer be possible for the
humidifier to reach its full capacity. The HM750
software monitors this condition and, when detected,
will stop operating and the Cylinder LED will be
illuminated.
DRAINS
• As steam is produced, minerals are left behind,
increasing the conductivity of the water. The HM750
auto-adaptive cycle will monitor the water conductivity
and perform drains to maintain the water at optimal
conductivity for peak performance.
• The auto-adaptive cycle ensures cylinder life is
maximized. It does this by keeping the tightest control
and most efficient use of water during the entire
cylinder life.
STEAM DISTRIBUTION
Steam generated by the humidifier may be introduced into
the air in two different ways. The humidifier may be
mounted directly onto the duct, to allow the steam
distributor nozzle to enter into the supply air duct.
Alternatively, the humidifier may be located remotely from
the air supply duct. It may be connected to the distributor
nozzle at the duct using a steam hose.
STEAM LINE
The steam line between the cylinder steam outlet and the
distributor nozzle serves two purposes: it is used as a
conduit to transfer the atmospheric steam from the
humidifier to the distributor nozzle, as well as providing a
means to remove condensate. See "Steam Line
Instructions" on page 7 for information on selecting steam
lines.
Whenever steam is distributed, condensate is formed in
the distribution system. Insulating steam lines is one
important way to reduce the amount of condensate
formed. Steam lines must also be sloped so that
condensate does not collect in the lines and create a
restriction to steam flow. As shown in the Plumbing
section, steam lines should maintain a slope back to the
humidifier of, as a minimum, 4 in. (10 cm) RISE per 12 in.
(30 cm) of RUN.
3
HM750A1000
33-00289EF—05