Economizer Damper Adjustment - Trane IntelliPak WEHE Series Installation, Operation And Maintenance Manual

System Start-up
Table 30. 50% exhaust fan drive selections (casings 2-9)
3 HP
Casing
Size RPM Drive No
500 5
600 6
2 700 7
800 8
900 9
500 5
600 6
3 700 7
800 8
900 9
4 & 5
6
9

Economizer Damper Adjustment

Exhaust Air Dampers
With the unit "Off", verify that the exhaust dampers (if
equipped) close tightly when the unit is off. Adjust the
damper linkage as necessary to ensure proper closure. An
access panel is provided under each damper assembly.
Fresh Air & Return Air Damper Operation
The fresh air and return air damper linkage is accessible
from the filter section of the unit. The damper linkage
connecting the fresh air dampers to the return air dampers
is preset from the factory in the number 1 position. Refer
to Table 31, p. 91 for the appropriate linkage position for
the unit and operating airflow (cfm).
WARNING
Reinforce base sheet metal surface!
Do NOT walk on the base sheet metal surface before it
has been reinforced. Bridging between the unit's main
supports may consist of multiple 2 by 12 boards or
sheet metal grating. Failure to comply could result in
death or serious injury.
Arbitrarily adjusting the fresh air dampers to open fully
when the return air dampers are closed or; failing to
maintain the return air pressure drop with the fresh air
dampers when the return air dampers are closed, can
90
5 HP 7½ HP
RPM Drive No RPM
800 8
900 9
1000 A
500 5 600
600 6 700
700 7
400 4 700
500 5
600 6
15 HP
Drive No RPM Drive No
6
7
7
500 5
600 6
700 7
800 8
overload the supply fan motor and cause building
pressurization control problems due to improper cfm
being delivered to the space.
The fresh air/return air damper linkage is connected to a
crank arm with a series of holes that allows the installer or
operator to modify the amount of fresh air damper travel
in order to match the return static pressure. Refer to
Table 31 for the equivalent return air duct losses that
correspond to each of the holes illustrated in
p. 93.
To Adjust the Fresh Air Damper Travel:
1. Drill a 1/4" hole through the unit casing up stream of
the return air dampers. Use a location that will produce
an accurate reading with the least amount of
turbulence. Several locations may be necessary, and
average the reading.
.
WARNING
Hazardous Voltage!
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1
OR UNIT DISCONNECT SWITCH 1S14. Disconnect all
electric power, including remote disconnects before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
Failure to disconnect power before servicing could
result in death or serious injury.
Figure 49,
RT-SVX35H-EN