McQuay MHC Series, Installation & Maintenance Data, Page: 6 / 36

Page 6 of 36 / IM 985-1
Note: Use the appropriate fasteners by others in
accordance with local building codes.
STOP! If an outside air damper kit is to be installed,
refer to IM 974 for the manual damper and the
motorized damper kit and install it now.
6 .­ Insert­fasteners­through­the­mounting­holes­in­
the subbase and finish securing the unit to the
floor, tightening the fasteners. Do not over-tighten
fasteners­and­distort­or­warp­the­subbase­plate .­
7 .­ Locate­mounting­brackets­at­locations­at­the­wall­as­
shown­in­Figure­3 .
Note: Brackets should be located approximately 3"
from the top of the chassis, or lower if clearance is
necessary to fasten bracket.
8 .­ Mark­the­position­of­the­bracket­mounting­holes­
onto­the­wall .­Remove­the­brackets­and­using­a­pre-
set­depth­drill,­pre-drill­holes­to­accept­a­wall­anchor­
(by­others) .
Failure to use a pre-set depth drill could result in serious
injury or death.
Note: It is preferred that the brackets are screwed
directly into a stud where available. However,
drywall anchors can be utilized when studs are
absent at bracket locations. It is the responsibility of
the installing contractor to provide the appropriate
fasteners and anchors to ensure that the unit is
secured properly.
WARNING
Left End View
Right End View
Provided Mounting
Brackets
Subbase
Chassis
(Shown removed from subbase for clarity)
Approximately 3"
5
Alternate Unit Installation
(Using Provided Brackets)
Procedure
1 .­ With­the­front,­left­and­right­cabinet­panels­
removed, set the entire unit in its final mounting
position .
2 .­ With­the­chassis­still­mounted­on­the­subbase,­
remove filter to allow access to the subbase bottom
plate .
3. Locate the existing 1/4" mounting holes in the
bottom­of­the­subbase­labeled­(5)­in­Figure­3 .
Note: Make sure electrical and piping connections
are in the proper location within the subbase end
piping compartment.
4. Transfer a mark with a marker or pencil to the floor
at­mounting­hole­locations­(5) .
5. Move unit away to pre-drill 1/4" mounting holes in
the floor at marked locations.
Clean unit mounting area of all construction debris. Check
that the floor is level and at 90 degrees to the wall as
shown in Figure 2, page 5
McQuay recommends the placement of a sound absorbing
mat beneath the unit footprint before continuing to the next
installation step.
IMPORTANT
Figure 3. Mounting Bracket Installation