Greenheck Fan VSU Make-Up Air Unit with Direct-Fired Gas Heater 470654 - Manual (Page 9)

9 Model VSU Make-Up Air
®
5. Fasten three (3/8 in. x 1-1/2 in.) hex head bolts into
the side of the platform
base. Secure each bolt
with two (3/8 in.) hex
head nuts placed back
to back on each bolt as
shown in Figure B. These
bolts will be used to
attach the platform base
to the unit.
6. Facing the control panel side of the unit, find the
center of the housing and drill a (7/16 in.) hole
through the housing and support stand (3/8 in.)
above the form line as shown in Figure C.
Next, drill two more (7/16 in.) holes through the
housing and support stand (12 in.) on either side of
the center hole, (3/8 in.) above the form line. These
holes are used to attach the platform base to the
unit.
7. Attach the service platform to the control panel
side of the housing by inserting the three (3/8 in. x
1-1/2 in.) bolts of platform base into the three holes
of the housing. Securely fasten with three (3/8 in.)
hex nuts.
8. Level service platform if necessary by adjusting
legs and then attach leg cross member with two
(3/8 in. x 3/4 in.) hex head bolts and 3/8 in. hex head
nuts.
9. Securely fasten all nuts and bolts. Make sure all
nuts and bolts are tight.
10. Attach arm rails of service platform to the housing
by first drilling a 5/16 in. hole through the housing at
the attachment point as shown in Figure D. Secure
arm rails to the housing with (3/8 in. x 1 in.) thread
cutting screws. Be sure not to over-tighten screws.
11. Attach safety chains to the right hand rail, across
the entryway. Assembly is complete.
Figure B
Assembly
1. Position platform base as shown below in Figure A
with the grate side up.
2. Attach the left and right handrails to the platform
base with (3/8 in. x 3/4 in.) hex head bolts and (3/8
in.) hex nuts as shown in Figure A. Use six bolts and
nuts on each rail.
3. Raise the platform base, grate side up, with a crane
or forklift.
4. Attach legs to the slots on sides of platform base
with two (3/8 in. x 3/4 in.) hex head bolts and
(3/8 in.) hex nuts.
Figure A
3/8 inch
Form Line
12 inches
12 inches
Figure C
Attachment Points
for Step 11
Figure D