5
Mode Selection Box Location
Consider the following items when positioning the mode
selection box for installation:
•
Sounds are made by refrigerant as solenoid valves
open and close inside the mode selection box. Do not
install the mode selection box where these sounds
may disturb building occupants.
•
The mode selection box must be sloped 1/8” toward
condensate drain outlet.
• Provide
suf
fi
cient clearance around mode selection
box to allow 3 feet of straight pipe before the
fi
rst
elbow or branch pipe is installed. See Figure 3.
•
If the unit is being installed in an application that
includes a sheet rock (plasterboard) ceiling, it is
required that an access panel be installed in a
suitable location. This will also allow access for
future maintenance (requirement of Lennox warranty
program).
Access is required during the commissioning process
to check the internal components, solenoid valves and
associated
fl
are nuts (See page 3), and to check the
local disconnect.
ANGLE IRON
BOLTED IN PLACE
ACROSS WOODEN JOISTS
WOODEN JOIST
Ǫ´7+5($'(
D
ROD
ANGLE IRON
ACROSS
WOODEN JOISTS
$1&+25
CONCRETE CEILING
USING ANCHORS
Ǫ´7+5($'(
D
ROD
STRUCTURAL CEILING
LEVELING NUT
Ǫ´7+5($'('
52'
SUSPENSION
BRACKET
SUSPENSION
BRACKETS
%2;08676/23(´
72:$5'&21'(16$7('5$,1&211(&7,21
Mode Selection Box Installation
Use the provided suspension brackets to suspend the
mode selection box(es) between the outdoor and indoor
units. The mode selection box location must be able to
accommodate the size of the box, as well as the required
3 feet of straight pipe length between the box and the
fi
rst
elbow or branch pipe. Refer to the dimension drawing on
Page 3 and Figure 3.
1. Make sure that the structural ceiling is able to support
the weight of the mode selection box(es). It may be
necessary to add extra support. If the structural ceiling
is constructed of concrete, install anchors to accept
four
⅜
inch threaded rods to suspend the mode
selection box. If the structural ceiling includes wooden
joists, use angle iron or a Unistrut channel
fi
xed
securely in place to accept the
⅜
inch threaded rods.
See Figure 1.
Figure 1. Suspending Methods
Figure 2. Suspension Hardware
NOTE - Threaded rod (requirement of Lennox
warranty program) is the ONLY acceptable method of
suspending the unit; do not use chains or straps.
2. Slide one nut and one washer onto each threaded rod.
Use electrical tape to keep the washer from failing off.
Position the nuts slightly above the
fi
nal resting place
of the four suspension brackets.
Model No.
Application
V8MSBB01*
1 group, 1 indoor unit maximum
V8MSBB02
2 groups, 4 indoor units maximum per group,
8 indoor units maximum
V8MSBB03
4 groups, 4 indoor units maximum per group,
16 indoor units maximum
V8MSBB04
6 groups, 4 indoor units maximum per group
24 indoor units maximum
*Use with VHIA072 and VHIA096 only.
Table 1. Mode Selection Boxes
3. Raise the mode selection box and insert the threaded
rods into the suspension brackets. Slide a washer
and then a nut onto each rod below each suspension
bracket. Use the leveling nut (beneath suspension
bracket) to adjust the mode selection box. Remove
the electrical tape holding the upper washers and nuts
in place and tighten each of the four nuts above the
brackets down onto the brackets. The mode selection
box must be sloped 1/8” toward condensate drain
outlet.
4. Continue with refrigerant piping connections.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFC’s and HCFC’s) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for non-compliance.