Trane Climate Changer T Series Installation Operation & Maintenance page 54

Installation - Piping
CAUTION
Coil Condensate!
Condensate must flow freely from the coil at all times to prevent coil damage from
water hammer, unequal thermal stresses, freeze-up and/or corrosion. In all steam coil
installations, the condensate return connections must be at the low point of the coil.
Failure to follow these instructions may result in equipment damage.
Proper steam trap installation is necessary for satisfactory coil performance and service
life. For steam trap installation:
1. Install the steam trap discharge 12 inches below the condensate return connection.
Note: Trane steam coils require a minimum of 2 psi of pressure to assure even heat
2. Trap each coil separately to prevent holding up condensate in one or more of the coils.
3. Install strainers as close as possible to the inlet side of the trap.
4. If installing coils in series airflow, control each coil bank independently with an
5. Use a modulating valve that has linear flow characteristics to obtain gradual
Note: Do not modulate systems with overhead or pressurized returns unless the
6. Pitch all supply and return steam piping down 1 inch for every 10 feet in the direction
Note: Do not drain the steam mains or take-offs through the coils. Drain the mains ahead
7. Ensure overhead returns have 1 psig of pressure at the steam trap discharge for every
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Twelve inches provides sufficient hydrostatic head pressure to overcome trap losses
and ensures complete condensate removal.
a. Use float and thermostatic traps with atmospheric pressure gravity condensate
return, with automatic controls, or where the possibility of low-pressure supply
steam exists. (Float and thermostatic traps are recommended because of gravity
drain and continuous discharge operation.)
b. Use bucket traps only when the supply steam is not modulated and is 25 psig or
higher.
distribution.
automatic steam-control valve. Size the traps for each coil using the capacity of the
first coil in direction of airflow.
modulation of the coil steam supply.
condensate is drained by gravity into a receiver, vented to atmosphere, and
returned to the condensate pump.
of the steam or condensate flow.
of the coils through a steam trap to the return line.
2 feet of elevation for continuous condensate removal.
T-Series Climate Changer Air Handler IOM • CLCH-SVX06A-EN