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Traps
NOTE: Do not place steam traps outdoors.
• Size traps in accordance with the manufacturers'
recommendations. Make sure the required pressure
differential is always available. Do not undersize.
• Use float and thermostatic or bucket traps for low
pressure steam. On high pressure steam, use bucket
traps. Use thermostatic traps only for air venting.
• Use bucket traps for ON/OFF control only.
• Locate traps at least 12 inches below the coil return
connection.
• Multiple coil installation—individually trap each coil or
group of coils.
• Coils in series—use separate traps for each coil, or a
bank of coils.
• Coils in parallel—a single trap can be used, but an
individual trap for each coil is preferred.
• Do not attempt to lift condensate when using modulating
or ON/OFF control.
• With coils arranged for series airflow, use a separate
control on each bank or coil in the direction of airflow.
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Valves
• Do not use modulating steam valves on high pressure
systems.
• Properly size modulating valves. Do not undersize.
• Avoid freezing conditions (entering air temperatures
below 35°F).
• Daikin strongly recommends 5JA, 8JA, 5RA and 8RA coils.
• Supply 5 psi steam to coils at all times.
• Do not use modulating valves. Provide control by face
and bypass dampers.
• Consider using two or three coils in series with two
position steam control valves on the coil or coils that
handle 35°F or colder air. Use a modulating valve on the
downstream coil to provide the desired degree of control.
• Thoroughly mix fresh air and return air before it enters the
coil. Also, to obtain true air mixture temperatures, properly
locate temperature control elements.
• As additional protection against freeze-up, install the
trap sufficiently below the coil to provide an adequate
hydrostatic head to remove condensate during an
interruption in the steam pressure. Estimate three feet for
each 1 psi of trap differential required.
• On startup, admit steam to coil ten minutes before
admitting outdoor air.
• Close fresh air dampers if steam supply pressure falls
below the minimum specified.
15
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IM 777-8 • Skyline Air Handler
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