VF, DHT, AES Series Manual |
Refrigerated Air Dryer User Manual
9
should be sized by a qualified electrician and comply with
all applicable national and local codes. Our company is
not liable for any code violations, component damage,
downtime or consequential damage related to customer
supplied electrical components and connections.
9. The ambient temperature should be between 40 °F and
100 °F. Low temperature could affect the dryer process
and result in high outlet dew point. In conditions where
the ambient drops below freezing, it is recommended that
a heat trace be used for the equipment. This will ensure
trouble-free operation during the winter months (the dew
point of the outlet air will be consistent).
• In some cases, a head pressure control valve may be
needed. (Optional)
10. Do not place the system in service until the above steps
have been completed and that all ratings and specifications
have been verified to match the requirements in the
drawing package supplied with the unit.
11. If there are any changes in the operating conditions of
the system from those published in this manual, contact
Technical Support.
3.4.1 AIR-COOLED CONDENSER REQUIREMENTS
Cooling air must be drawn from a clean source to reduce dust
and dirt accumulation on the condenser coils. Air temperature
should not exceed 100°F (38°C).
3.4.2 COOLING WATER REQUIREMENTS (WATER-
COOLED CONDENSING UNITS)
Cooling water is required for water-cooled refrigerant
condensers (scfm rated model 100 and up). The user is
responsible for piping the water to and from the condenser.
The required water flow rate depends on the water
temperature. A water-regulating valve (supplied with the dryer)
automatically adjusts the flow to compensate for variation in
water temperature, water pressure, and dryer air load. The
table below indicates the amount of cooling water required
in gallons per minute (gpm) at given incoming temperatures
for the condenser Hp size in each model. The refrigerant
discharge pressure control will shut down the refrigerant
compressor if cooling is inadequate.
NOTICE:
• Water cooled condensers are pre-set at the factory for city
water usage.
• Water regulating valve may need to be adjusted to other
water supply conditions. Contact technical support for
assistance.
• Minimum water pressure is 25 psig for city water and 35
psig for tower water. Cooling water pressures less than
these minimums may reduce dryer drying capacity.
• Maximum water pressure is 125 – 150 psig.
• Water flow rate requirements must be increased by 10%
for seawater cooled condensers (Assuming 3.5% salinity
at 77°F.
Drain
Valve
Air or Water
Cooled
Condenser
Air
Compressor
Drain
Valve
Dry Air
to Plant
Drain
Valve
Refrigerated Dryer
After Filter
Pre-Filter
Wet Receiver
(optional)
Dry Receiver
(optional)
Separator
Drain
Valve
FIGURE 3-1: Typical Installation Setup
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