McQuay RCS User Manual

Page 48 IM-738
Preparing Unit for Operation
Relief Damper Tie-Down
Economizer sections with a 30" or 40" return fan have a
relief damper that is tied down for shipping. Two brackets
and two screws must be removed before operation to allow
free movement of dampers. Access is from inside the econo-
mizer section.
Spring Isolated Fans
Release of Spring Mounts
The optional spring-mounted supply and return fans are
locked down for shipment. Hold-down fasteners are located
at each spring mount. These fasteners must be removed
before operating the fans. Figure 59 shows a typical spring
mount. Note that the 3/8" hold-down bolt securing the fan
base to the unit cross channel must be removed, as well as all
1/4"screws directly above the spring mount.
In some unit arrangements, one of the 3/8" hold-down bolts
lies below the motor base. The bolt can be reached with a
9/16" socket and must be removed.
After removing the hold-down fasteners, the fan assembly
should be rocked by hand to check for freedom of movement.
Figure 59. Spring Mounted Hold-Down Fasteners - All Units
Figure 60. Supply Fan Assembly - All Units
Adjustment of Spring Mounts
During operation, all fans should ride level, with the bottom
of the fan base approximately 3/8" (10mm) above the top of
the unit's cross channel. Unhoused single-width "plug" fans
will also ride at this level when at rest.
When not operating, housed double-width fans will ride
lower at the discharge end of the fan base than at the motor
end. When the fan is operating against a static pressure, it
should run level. If not, level the assembly as follows
(refer to Figure 61):
1. Loosen the 15/16" jam nut above the fan base.
2. Using a large, straight blade screwdriver, turn the 5/8"
leveling screw clockwise to lower the fan base, counter-
clockwise to raise the fan base.
3. When properly adjusted, retighten the jam nut.
Figure 61. RDT Spring Mount Hold Down Fasteners
WARNING
Moving machinery hazard.
May cause severe injury or death.
Disconnect power and lock off before servicing
equipment. More than one disconnect may be required
to de-energize unit.
3
/ 8 " H o l d - d o w n B o l t
( M a y b e s e c u r e d t o
e
i t h e r f l a n g e o n
c
r o s s c h a n n e l ) ;
R e m o v e B e f o r e
R u n n i n g F a n
1 / 4 " H o l d - d o w n S c r e w ;
R e m o v e B e f o r e
R u n n i n g F a n
WARNING
Moving machinery hazard.
May cause severe injury or death.
The fans must be started for the first time in
accordance with the “Check, Test, and Start
Procedures” on page 77. If this is not done, severe fan
damage can occur.
F a n
B a s e
3 / 8 " ± 1 / 4 "
W I T H F A N
R U N N I N G !
S
p r i n g
M o u n t
A
s s e m b l y
C r o s s
C h a n n e l
L e v e l i n g
S c r e w J a m N u t
H o l d - d o w n
F a s t e n e r s
H o l d - d o w n
F a s t e n e r s

McQuay RCS Specifications

General

Brand	McQuay
Model	RCS
Category	Air Handlers
Language	English