Page 8
MS8C / MS8H (208-230V)
II. INSTALLATION
IMPORTANT INSTALLER INFORMATION
* Confirm proper slope and routing of condensate lines to ensure moisture is drained away from the indoor unit (see
procedure starting on page 12)
* Confirm proper insulating, taping and bundling of refrigeration lines, main power lines and drain line (see procedure
starting on pages 25).
General
The MS8 air conditioners and heat pumps are matched with
an indoor evaporator unit to create a ductless system that
uses HFC-410A refrigerant.
Clearances
CAUTION
In order to avoid injury, take proper precaution when lifting
heavy objects.
SYSTEM CLEARANCES
Refer to figure 2 for mandatory installation clearance
requirements.
A
B
C
D
E
F
G
H
I
INSTALL UNIT AWAY
FROM WINDOWS
MINIMUM INSTALLATION CLEARANCES
FIGURE 2
TABLE 4
MINIMUM SYSTEM CLEARANCES
ID Location
Clearance
Required
A Clearance between unit and ceiling. 6 in. (152 mm)
B Clearance between unit and floor. 6 ft.(1829 mm)
C / D Clearance to the right and left of unit. 6 in. (152 mm)
E Clearance above unit. 2 ft. (610 mm)
F
Clearance between air inlet and
structure.
12 in. (305 mm)
G
Clearance between unit and
structures
12 in. (305 mm)
H 4 ft. (1219 mm)
I 12 in. (305 mm)
Torque Requirements for Caps and Fasteners
When servicing or repairing HVAC components, ensure the
fasteners are appropriately tightened. Table 5 provides
torque values for fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc -
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory-torqued (from 9 ft-lbs for
small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
See the Lennox Service and Application Notes #C-08-1
for further details and information.
TABLE 5
TORQUE REQUIREMENTS
Parts
Recommended Torque
United States
Customary
System*
Metric
(Newton Meter)
Service valve cap 8 ft.- lb. 11
Sheet metal screws 16 in.- lb. 2
Machine screws #10 27 in.- lb. 3
Compressor bolts 7 ft.- lb. 10
Gauge port seal cap 8 ft.- lb. 11
*The United States customary system (also called American system) is a
system of measurement commonly used in the United States. This system
is based on the British Imperial System.
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