5
Torque Requirements for Caps and
Fasteners
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. “Table 1. Torque
Requirements” provides torque values for fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc -
Rockwell scale minimum). Fully insert the wrench into
the valve stem recess.
Service valve stems are factory-torqued from 9 ft.-lbs.
(12 N*m) for small valves, to 25 ft.-lbs. (34 N*m) 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 1. Torque Requirements
Parts
Recommended Torque
U.S.
Newton-Meter- N
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
Outdoor Unit Installation
Placement Considerations
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Consider the following when positioning the unit:
• In coastal areas or other places with salty atmosphere
of sulfate gas, corrosion may shorten the life of the
unit. In coastal areas, the coil should be cleaned with
potable water several times per year to avoid corrosive
buildup (salt)
• Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the property where the unit is in-
stalled. Install the unit as far as possible from the prop-
erty line
• When possible, do not install the unit directly outside
a window. Glass has a very high level of sound trans-
mission
• Install unit level
Ground
Level
Building Structure
Figure 4. Install Unit Level
• Choose a place solid enough to bear the weight and
vibration of the unit, where the operation noise will not
be amplified
• Choose a location where the hot air discharged from
the unit or the operation noise will not be a nuisance
to neighbors
• Avoid installing the outdoor unit near a bedroom or
other places where noise may cause a problem
•
There must be sufficient space to carry the unit into
and out of the site
•
There must be unobstructed air flow around the air in
-
let and the air outlet
•
The unit must not be installed in areas where a flam
-
mable gas leak may occur
•
Install the outdoor unit a minimum of 3 feet (1m) away
from any antenna, power cord (line), radio, telephone,
security system, or intercom. Electrical interference
and radio frequencies from any of these sources may
affect operation
• Since water drains from the outdoor unit during vari-
ous stages of operation, do not place anything which
may be damaged by moisture under the unit
Direct Sunlight, Rain, Snow and Ice Protection
• If the outdoor unit is subjected to prolonged exposure
to direct sunlight with temperatures over 100°F (38°C)
a canopy is recommended as illustrated in “Figure 5.
Outdoor Unit on Pedestal (Stand) and Protective Can-
opy” on page 6 or “Figure 10. Dog House-Style
Shelter” on page 7
IMPORTANT
The construction of a canopy or shade is necessary
because of an ambient limit control set to 122°F (50°C)
to protect the electronics. If the outdoor unit is placed in
direct sunlight it is possible that the limit may activate
and shut down the unit.
• Place unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil or
into unit. Construct a canopy as illustrated in “Figure 5.
Outdoor Unit on Pedestal (Stand) and Protective Can-
opy” on page 6
