54
T-Series Climate Changer Air Handler IOM •
CLCH-SVX06A-EN
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.
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.
Note: Trane steam coils require a minimum of 2 psi of pressure to assure even heat
distribution.
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
automatic steam-control valve. Size the traps for each coil using the capacity of the
first coil in direction of airflow.
5. Use a modulating valve that has linear flow characteristics to obtain gradual
modulation of the coil steam supply.
Note: Do not modulate systems with overhead or pressurized returns unless the
condensate is drained by gravity into a receiver, vented to atmosphere, and
returned to the condensate pump.
6. Pitch all supply and return steam piping down 1 inch for every 10 feet in the direction
of the steam or condensate flow.
Note: Do not drain the steam mains or take-offs through the coils. Drain the mains ahead
of the coils through a steam trap to the return line.
7.
Ensure overhead returns have 1 psig of pressure at the steam trap discharge for every
2 feet of elevation for continuous condensate removal.
