IOM / Rooftop Smart and Linéa™ Range - Page 39
GR
GR
GR
GR
GRA
A
A
A
A VITY EXHA
VITY EXHA
VITY EXHA
VITY EXHA
VITY EXHAUS
US
US
US
UST DAMPERS
T DAMPERS
T DAMPERS
T DAMPERS
T DAMPERS
Gravity exhaust dampers allow exhaust air to be discharged
from the system when an economiser and/or power exhaust
is operating. Gravity exhaust dampers also prevent outdoor
air infiltration during unit off cycle.
Gravity exhaust dampers are used in downflow air discharge
applications. Horizontal gravity exhaust dampers are used
in horizontal air discharge applications and are installed in
the return air plenum.
INSTALLATION -
Downflow Application
1. Disconnect power to unit. Remove lower rear unit pa-
nel.
2. Remove screw in damper or sheet metal straps across
face of dampers which hold dampers in place for
shipping.
3. Apply foam insulating tape around the back of the
flanged edges of the gravity exhaust damper assembly.
NOTE : on unit when gravity exhaust damper is being used
with the power exhaust fans, gravity exhaust damper is
installed over the outside side of the power exhaust fan
assembly.
4. Align holes along the flanged edge of the gravity
exhaust damper with holes along the bottom of the unit.
5. Use screws provided to secure gravity exhaust
assembly to unit.
6. Reapply power to unit.
GRAVITY EXHAUST DAMPER INSTALLATION
Figure 53
NOTE :
Apply foam insulating tape
to back of flanged edges
before installing
749
330
165
102
HORIZONTAL GRAVITY EXHAUST DAMPER INSTALLATION
Figure 54
RETURN AIR
PLENUM
HOOD SIDE
VIEW
Plenum
Foam tape
Hood assembly
Damper
assembly
Gravity exhaust dampers must be used any time a power
exhaust damper is installed in an LINEA Series unit. A gravity
exhaust damper is required in the system when an
economiser is installed unless other provisions are made to
exhaust indoor air.
INSTALLATION -
Horizontal Application
1. Cut opening in return air plenum on 020 to 045 units
and two openings in return air plenum on 055 to 090
units. See figure 53 for dimensions. Make sure
openings is centered top to bottom in plenum. On 055
to 090 units, gravity exhaust dampers may be installed
either on opposing sides of plenum or adjacent to each
other. If adjacent, allow a minimum of 102mm between
the two openings.
2. Secure hood sides to hood top as shown in figure 53.
3. Apply foam insulating tape around the back of the
flanged edges of the horizontal gravity exhaust damper
assembly.
4. Align screw holes on top edges of hood and damper
assembly.
5. Slide combined horizontal gravity exhaust damper
assembly into plenum opening and secure using screws
provided (see figure 53).
