GENERAL DESCRIPTION
11
HUMIDITY
The ZPH-Series chambers provide the same temperature ranges for heating and
cooling as the ZP-Series, but add the ability to control humidity within the range
of 10% to 98% relative humidity as limited by a 185°F (85°C) maximum dry bulb
temperature and a 45°F (7°C) dewpoint. The chambers have the ability to
control humidity as low as 5% when the Dry Air Purge / Low RH option is
utilized. Standard systems use a steam generation humidity system. Refer to
Figure 4. for more information on achievable humidity points.
HUMIDITY COMPONENTS (Steam Generator System)
The water supply connection for humidity is located at the rear of the unit.
The following is a description and function of the major components.
A. (OPTIONAL) Water Valve and Rack Assembly (Located at the rear of unit)
1. The valve is used to temporarily turn off the water supply in order to
change the demineralizer filter without interrupting chamber operation.
2. The rack holds the demineralizer filter.
B. (OPTIONAL) Demineralizer Filter (Located at rear of unit)
1. The filter removes most common impurities from tap or soft water.
2. The outer casing of the filter is transparent, and the crystals are visible. A
new cartridge is violet or dark blue when water flows through it. A spent
cartridge will turn brown, orange, yellow or white. The cartridge should
be changed before it completely changes color. A reference mark is
provided on the filter to indicate when it should be changed. Spare
cartridges are available through the CSZ Service Department. Refer to the
Humidity Maintenance Section for instructions on how to change the
filter.
C. Water Fill Solenoid
1. This is a normally closed solenoid valve and is energized (opened) only
when the float switch in the steam generator drops below the reset level.
The valve remains energized until the water is at the right level.
D. Steam Generator System
1. The steam generator provides humidity in the form of steam. The steam
generator has a multi-level float switch which controls the water level.
The heater boils the water to generate steam. The steam is injected into
the chamber.
2. A high temperature safety thermostat is located on the side of the steam
generator. It will remove heater power if an over-temperature situation is
reached.
E.
(OPTIONAL) Water pressure regulator
1. Reduces incoming water pressure to 10 PSI (69 kPa) for an atomizer and
25PSI (172 kPa) for a boiler.
Water specification 0.05 to
2 Mega OHMS in addition
to <2mg/L of free chlorine
pressure is 10 PSI (69kPa)
for an atomizer and 25 PSI
(172 kPa) for a boiler.
Exceeding this pressure
may cause catastrophic
failure of the filter housing.
For optimal use of the
atomizer and boiler
systems, inlet water
pressure should not fall
below 10 PSI (69 kPa) for
both boilers and atomizers.
Failure to maintain cartridge
may result in chloride
corrosion of stainless-steel
interior surfaces which is not
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