Nonaccessible Ceilings - Carrier Moduline 37HS Series Installation, Start-Up And Service Instructions Manual

NONACCESSIBLE CEILINGS — Nonaccessible ceilings
include plaster and concealed spline ceilings. These appli-
cations require the 37HS equipped with a removable dif-
fuser assembly. Removal of the diffuser assembly allows ac-
cess to the unit controls and tubing connections. To remove
diffuser assembly, loosen 3 screws by inserting an allen wrench
through diffuser slot as shown in Fig. 20. After diffuser is
removed, disconnect aspirator tube and the tube connected
to thermostat. When using removable diffuser with standard
controls, longer tubing must be installed between thermostat
and volume controller and between aspirator and unit end.
This will enable connections to be retained when diffuser
assembly is dropped below the ceiling line. Disconnect as-
pirator and thermostat connections before completely re-
moving diffuser. When diffuser assembly is reinstalled, the
connections can be made below the ceiling line and the as-
sembly completed with the capscrews.
Plaster Ceiling— Obtain plaster frames field fabricated to
the dimensions shown in Fig. 21. Install accessory hanger
mounting brackets on the unit. The diffuser protective tape
should be left in place during the installation.
Unit installation details may differ due to the many plas-
tering methods used. The actual installation procedure is left
to the discretion of the individual plasterer. One typical
Fig. 20 — Installation Details, Moduline® Air Terminals in a Plaster Ceiling
method, shown in Fig. 20, shows 2 Model 37HS Moduline®
air terminals installed. Wire hangers with eyebolts for lev-
eling and supporting the terminals are shown at the plenum
ends. The units are directly coupled for a feed-thru appli-
cation, with an end trim piece used between units. The end
trim piece may be fastened to either unit. One unit is a con-
trol unit and the other a slave unit. A 12-in. crossover tube
is used to make the control connection. The end trim strip is
added to the diffusers of the end units before the actual in-
stallation. Then the units are suspended below the finished
ceiling level. A field-supplied plaster frame is installed com-
pletely around the unit. A wire mesh which is supported by
wires from the ceiling cross members is then attached to the
plaster frame. These cross members have been wired to main
runners which have been suspended from the building struc-
ture. The plaster scratch coat is then troweled beyond the
edge of the side diffuser. When the plaster has set, the unit
is then raised to the proper level. This is accomplished either
through hand holes cut into the plaster, through a nearby light
fixture, or by removing the diffuser assembly. The final sur-
face finish is now applied with diffuser assembly lowered
3 ⁄ in. from unit.
8
NOTE: The entire diffuser assembly must be removable from
the unit for access to the unit and controls.
11