46 UNT-SVX07B-EN
Installation—Mechanical
Note: Instructions for using this chart appear on the preeding page. For the manual circuit setter
provided with fan-coil or Force-Flo units, use the ‘M’ .
NOTICE
Coil Damage!
In all steam coil installations, the condensate return connections must be at the low point of the
coil to ensure condensate flows freely from the coil at all times. Failure to do so could cause
physical coil damage from water hammer, unequal thermal stresses,freeze-up and/or corrosion.
1. Make piping connections to the steam coil as shown in Figure 15. Cap the unused connection.
2. The coil is already pitched within the unit to provide proper pitch to drain condensate out of the
coil. Verify that the unit has been properly leveled.
3. Install a 1/2-inch, 15-degree swing check vacuum breaker in the unused condensate return
tapp
ing as close as possible to the coil.
4. Vent the vacuum breaker line to atmosphere or connect it into the return ma
in at the discharge
side of the steam trap.
5. Pitch all steam supply and return mains down a mi
nimum of one inch per ten feet in the
direction of flow.
6. Do not drain the steam mains or
take-off through the coils. Drain the mains ahead of the coils
through a steam trap to the return line.
7. Overhead returns require one psig of pressure
at the steam trap discharge for each two-feet
elevation to ensure continuous condensate removal.
8. Proper steam trap selection and installation is necessary for
satisfactory coil performance and
service life. For installation, use the following steps:
a. Position the steam trap discharge at least 12 inc
hes below the condensate return connection.
This provides sufficient hydrostatic head pressure to overcome trap losses and ensure
complete condensate removal.
b. Trane recommends using flat and thermostatic traps because of gravity drain and
continuous discharge operation.
c. Use float and thermostatic traps with atmospheric pressure gravity condensate return, with
automatic controls or where the possibility of low pressure supply steam exists.
d. Always install strainers as close as possible to the trap inlet side. Reference Figure 14 for an
example of a properly piped steam coil.
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