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Fig. 18 — Outdoor-Air Thermostat/
Enthalpy Control Installation
LEGEND
OAT — Outdoor-Air Thermostat
NOTE: See unit wiring diagram for more details.
Fig. 19 — Wiring Connections for Outdoor-Air Thermostat
Fig. 20 — Varislide™ Economizer Barometric Relief
Damper Characteristics
c. Connect T and T1 to the 24 V power supply.
d. After installation is complete, calculate the mini-
mum airflow across the economizer. To calculate the
minimum airflow, the following data is needed: total
cfm (cfm
), temperature of the total cfm (T
3
perature of the return air (T
the entering outside air (T
cfm, which will be the minimum airflow.
T
(cfm
) + T
1
1
cfm
cfm
= (cfm
2
Therefore:
T
(cfm
) + T
1
1
Use this equation to determine cfm
mum airflow across the economizer.
cfm
=
1
If cfm
does not match the desired minimum air-
1
flow from Step 1, re-adjust the minimum position set-
ting screw.
—15—
), and temperature of
2
). Cfm
is the outside air
1
1
(cfm
)
2
2
= T
3
3
– cfm
)
3
1
(cfm
– cfm
)
2
3
1
= T
cfm
3
, which is the mini-
1
(T
– T
) cfm
3
2
3
(T
– T
)
1
2
), tem-
3
3
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