Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
7
SECTION ONE — Receipt & Initial Installation, Cont'd.
BEFORE beginning the connection of the various cooling
and/or heating mediums to the unit.
Horizontal Unit Drain Pan Removal
CXB, CBY, CHY and CPY Horizontal models come with a
removable drain pan. The drain pan should be removed
before installing or servicing the valve package. An
extended drill bit may be necessary to access the screws
to remove the drain pan.
NOTE: Exact location of screws to remove drain pan may vary based
on Horizontal model.
Valve Package Installation and Maintenance
All accessory valve packages should be installed as
required, and all service valves should be checked for
proper operation.
If coil and valve package connections are to be made with
a “sweat” or solder joint, care should be taken to assure
that no components in the valve package are subjected
to a high temperature which may damage seals or other
materials. Many two-position electric control valves,
depending on valve operation, are provided with a manual
opening lever. This lever should be placed in the “open”
position during all soldering or brazing operations.
If the valve package connection at the coil is made with
a union, the coil side of the union must be prevented
from twisting (“backed up”) during tightening to prevent
damage to the coil tubing. Over-tightening must be
avoided to prevent distorting (“egg shaping”) the union
seal surface and destroying the union.
The supply and return connections are marked on the coil
stub-outs and the valve package, with an “S” meaning
supply or inlet and “R” meaning return or outlet indicating
flow direction to and from the coil. Blue letters mark the
chilled water connections and red letters mark the hot
water or steam connections. In the case of field-installed
valves and piping, the chilled water valve cluster (or
expansion valve on DX units) should be installed in such
a way that any dripping or sweating is contained in the
drain pan or other device such as an optional extended
drain pan or factory drip lip. Factory drip lips are field
installed and may be packaged separately from the unit.
Factory supplied cooling coil valve packages will be
arranged to locate as much of the package as possible
over a standard drip lip.
If none of the above factory accessories have been
provided with the units, a drip lip (available from the
factory) may still be required to direct piping condensate
into the unit drain pan.
After the connections are completed, the system should
then be tested for leaks. Since some components are not
designed to hold pressure with a gas, hydronic systems
should be tested with water. Pressure testing should be
completed prior to sheet rocking or painting.
CAUTION: All water coils must be protected
from freezing after initial filling with water.
Even if the system is drained, unit coils may still hold
enough water to cause damage when exposed to
temperatures below freezing.
Refrigerant systems should be tested with dry nitrogen
rather than air to prevent the introduction of moisture
into the system. In the event that leaking or defective
components are discovered, the Sales Representative
must be notified BEFORE any repairs are attempted.
All leaks should be repaired before proceeding with the
installation.
After system integrity has been established, the piping
should be insulated in accordance with the project
specifications. This is the responsibility of the installing or
insulation contractor. All chilled water piping and valves
or refrigerant suction piping not located over drain pans
or drip lips must be insulated to prevent damage from
sweating. This includes factory and field piping inside the
unit cabinet.
Condensate Drain: The drain should always be connected
and piped to an acceptable disposal point. For proper
moisture carry-off, the drain piping should be sloped away
from the unit at least 1/8 inch per foot. A drain trap may
be required by local codes and it is strongly recommended
for odor containment. When furnished, the optional 5/8-
inch secondary or “tell-tale” connection must be piped to
