11
COIL INSTALLATION
WATER, STEAM, DX & AMMONIA
Visit http://www.titan-air.com/ and click on “Tools & Resources” and then the “Technical” tab for
more detailed installation and maintenance instructions.
DESIGN REQUIREMENT: Piping must be sized and installed in accordance with
applicable codes and standards. Refer to equipment name plate for flow and
pressure ratings.
Cooling coil piping must be properly insulated up to coil header (inside air handler) to prevent
condensate from dripping outside of the drain pan. Utilize sealant between piping or coil stub and
equipment casing before applying insulation. Some coils are equipped with multiple header
connections to allow for universal airflow direction. Extra connections are capped in the field.
WATER, STEAM & AMMONIA
IMPORTANT: Always use a backup wrench when attaching piping to coils with
copper headers. Do not overtighten coil connections. Support coil piping
independently of the coils. Swing joints or flexible fitting may be needed to avoid
thermal expansion/contraction strains.
INSTALLATION CONSIDERATION: Exercise caution when using Teflon tape or a
piping compound not to overtighen the piping connections.
Piping should be equipped with shut-off
valves and union fittings to facilitate coil
removal. Water coil piping is typically
arranged to provide counterflow operation
(supply piping on lower, air leaving side of
coil and return on upper, air entering side)
See Diagram, on the right.
Verify that equipment is installed level to
allow for free draining. External vent and
drain connections are recommended. When
coils are drained, compressed air must be
applied to the vent connection for a complete
purge. Coils must be vented of air on initial
start-up and each time the coil is re-filled. This can be accomplished manually, or a commercially
available hydronic system air eliminator can be installed.
Water coils must be protected from freezing if cold outside air moves across the coil. Chilled
water coils should be drained or use a suitable anti-freeze solution during cold weather. Additional
steps can be taken to reduce likelihood of freezing a coil including:
Use a pre-heat coil with modulating valve forced fully open below a set outside air
temperature. This is typically accompanied by a reheat coil or face & bypass
dampers to provide supply air temperature control.
A coil loop pump to produce constant flow through the coil with modulation
accomplished by varying the percentage of supply water and return water to the
coil. Providing constant flow with variable temperature instead of variable flow
through the coil reduces the opportunity for freeze-up.
VENT
WATER
OUT
WATER
IN
DRAIN
AIR OUT
AIR IN
WATER COIL COUNTERFLOW DIAGRAM
HEAD
ER
HEAD
ER
