INSTALLATION PROCEDURES
3-19
Figure.3-14 Steam Valve Connection
Table 3-4 Steam Requirements High Pressure
Consumption (Approximate)
2. Installation Instructions
To insure that an adequate supply of steam is provided, be sure that the steam supply and
steam return lines are sized and laid out as stipulated in this manual. Inadequate steam supply and
steam return lines or improper steam plumbing will result in poor performance and can cause
component failure. Clean, dry, regulated steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will. VOID THE
WARRANTY.
a. The pressure of the condensate in the steam supply will cause water hammer and
subsequent heat exchanger (steam coil) failure. The steam supply connection into the
main supply line must be made with a minimum 12 – inches riser. This will prevent any
condensate from draining towards the dryer.
b. The steam supply piping to the dryer must include a 12 – inches rise along with a drip
trap and check valve. This will prevent any condensate from entering the steam coil.
c. Flexible hoses or couplings must be used. The dryer vibrates slightly when it runs and
this will cause the steam coil connections to crack if they are hard piped to the supply and
return mains.
d. Shut – off valves for each dryer should be installed in the supply, return, and drip trap
return lines. This will allow the dryer to be isolated from the supply and return mains if
the dryer needs maintenance work.
e. Install an inverted bucket steam trap and check valve for each unit at least 12 – inches
below steam coil as close to the coil as possible. A trap with a capacity of 1,200 pounds
of condensate per hour at 125 Psi is needed for each unit.
f. A 3/4” vacuum breaker should be installed for each unit in the piping. This will prevent
the condensing steam from causing a vacuum inside the coil and possibly damaging the
coil.
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