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Installation Manual – THH
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THH HIGH PERFORMANCE HORIZONTAL
FAN COIL UNITS
Section 1 - Receipt & Initial Installation
COIL HANDING
This unit features a field reversible coil assembly should the need arise
upon installation to change the handing of the coil. To change the coil
handing, remove the plenum box (if applicable) from the coil by removing
all screws to the coil casing. Next, remove the fan(s), fan deck, and top
and bottom casings from the coil. Replace the bottom coil casing in the
top coil casing position and the top coil casing in the bottom coil casing
position and reattach the fan deck, fan(s) and plenum box (if applicable) in
the original locations.
The leaving air side of the fin pack will remain the same
after changing the coil handing.
COILS
All fan coils are available in 2 or 4 pipe configurations. Heating and cooling
coils are field reversible for right or left side connections. On units with
water coils, the maximum water pressure applied to the unit should never
exceed 300 PSIG at 200°F. On units with steam heating coils, the maximum
steam pressure applied to the unit should never exceed 15 PSIG. The drain
piping and steam trap should be sized and routed to allow for proper
condensate flow. (Minimum ambient temperature 35°F. Coils may freeze.)
PIPING CONNECTIONS
Toxic residues and loose particles resulting from
manufacturing and field piping techniques such as joint
compounds, soldering flux, and metal shavings may be
present in the unit and the piping system. Special
consideration must be given to system cleanliness when
connecting to solar,domestic or potable water systems.
Submittals and Product Catalogs detailing unit operation, controls, and
connections should be thoroughly reviewed BEFORE beginning the
connection of the various cooling and/or heating mediums to the unit.
All accessory valve packages should be installed as required, and all valves
should be checked for proper operation.
note
caution
If coil and valve package connections are to be made with “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. Valve bodies should be wrapped with a wet rag to help
dissipate heat encountered during brazing. Use a brazing alloy to make
connections such as BCup- 2. Soft solder is not recommended.
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 the union seal surface and destroying the
union. 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 auxiliary drain pan
or other device. Valves and TXV’s should be secured or supported to avoid
damage to coil headers or distributor tubes.
DUCT WORK CONNECTIONS
All duct work and/or supply and return grilles should be installed in
accordance with the project plans and specifications. If not included on
the unit or furnished from the factory, Johnson Controls supply and return
grilles are available in a variety of types.
All units must be installed in non-combustible areas. Some models are
designed to be connected to duct work with a MINIMUM amount of
external static pressure. Consult the approved submittals and the product
catalog for unit external static pressure limitations.
Units provided with outside air for ventilation should have some form of
low temperature protection to prevent coil freeze-up. Outside air should be
pretreated for best results.
It should be noted that none of these methods would adequately protect
a coil in the event of power failure. The safest method of freeze protection
is to use glycol in the proper percent solution for the coldest expected air
temperature. Consult glycol supplier literature for correct solution ratios.
The manufacturer assumes no responsibility for undesirable system
operation due to improper design, equipment or component selection, and/
or installation of duct work, grilles, and other field supplied components.
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