035-16734-000
560.20-N1Y
Unitary Products Group
19
SUPPLY AIR DUCTS
See Figure 11 for suggested method of connecting supply air
ductwork.
Duct should be sized no smaller than the duct flanges on the
blower section.
Use flexible fiberglass or plastic cloth collars or other non-
flammable materials at the duct connections to minimize the
transmission of noise and vibration.
RETURN AIR DUCT FLANGE
The inlet duct frame connection is shipped on the front of the
unit. When the return air grille is used, the duct connection
frame is not used. Refer to Figure 2, 3 and 4.
NOTE:If return air duct is not used, applicable installation
codes may limit the unit to installation only in a single story
area.
INSULATION
Insulation should be applied to ductwork where it passes
through and unconditioned area during the cooling season, or
though unheated space during heating season.
Insulation should include vapor barrier to prevent absorption
of moisture by insulation.
CONDENSER WATER PIPING
1.
All internal condenser water piping in these units are
completely factory assembled.
2.
Units are arranged for piping connections on the right.
(Same side as electrical.) However, knockouts are also
provided in left end panel for piping connections if
desired. Supply and return elbow connections may be
rotated to provide for left-hand connections. Inlet water
must always enter at the lower connection of the con-
denser (See Figure 12).
3.
When local water conditions require it, install strainer in
the supply line to the condenser.
4.
It is recommended that a flexible connection be provided
between condenser and supply and return mains if noise
and vibration transmission could be a problem.
5.
Water piping should include stop valves so that any unit
can be serviced without shutting down and draining the
entire system. Since the units will be piped in parallel
(not in series), the stop valves may be used to equalized
the pressure drop through every parallel circuit for even
condenser water distribution.
PRECAUTIONS AGAINST FREEZING
1.
When units are in locations subject to freezing tempera-
tures, condenser must be drained during shut down.
FIGURE 12 : COILS AND WATER CONNECTIONS
(CED090 SHOWN)
TABLE 16: WATER CONNECTION SIZING
INLET & OUTLET WATER CONN.’S
(NPT, FEEM
CED060
1”
CED090
1-1/4”
CED120
1-1/4”
CED180
1-1/2”
WATER MUST BE BLOWN FROM CONDENSER,
AS IT WILL NOT DRAIN COMPLETELY BY
GRAVITY BECAUSE OF THE SPIRAL DESIGN.
A WATER FLOW SWITCH IS RECOMMENDED
ON THE WATER OUTLET CONNECTION
(EXTERNAL TO THE UNIT) TO PREVENT THE
COLLASPE OF THE TUBES INSIDE THE
REFRIGERANT TO WATER HEAT EXCHANGER
DUE TO LACK OF WATER FLOW.
WATER OUTLET
CONDENSERS
WATER INLET
