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9UH-PRC001-EN
Application
Considerations
General Notes
The following general notes on piping
propeller unit heaters are presented
based on competent engineering and
installation practice:
1. Suspend unit heaters securely with
provisions for easy removal.
2. Make certain units hang level vertically
and horizontally.
3. Provide for expansion in supply lines
(note swing joints in suggested piping
arrangements).
4. Provide unions adjacent to unit heaters
in both supply and return laterals. Also
provide shut-off valves in all supply
laterals.
5. Use 45' angle runoffs from all supply
and return mains.
6. Provide at least 7" (more if necessary)
clearance above tops of Model P
Projection Unit Heaters. Motors are
removable from below on all sizes.
It is desirable to form dirt pockets with
pipe of the same size as the return
tapping of the unit heater. Pipe in the
branch-off should be the same size as the
tapping in the trap. Beyond the trap, the
return lateral should be increased one
size to the return main.
Figure AC-2
Figure AC-3
High Pressure Steam System
Overhead supply main is used with
lower return main. Where steam
pressure fluctuates over a wide range, a
swing check valve should be placed in
the return lateral between strainer and
bucket trap to prevent reverse flow of
condensate of flash steam when
pressure drops suddenly. Top of bucket
trap must be located below return outlet
of coil for complete drainage of
condensate. Refer to Figure AC-3.
Hot Water System – Using Circulating
Pump
Overhead supply and return mains are
used with bottom connections to mains.
Manual vent (pet cock) is used at high
point on return main. Automatic air vent
may be substituted if desired. Refer to
Figure AC-2.