Section 11 - W7220 JADE™ Economizer Module
127 Honeywell Economizers 63-8594-02
Fig. 12. Single Enthalpy curve and boundaries.
Table 12. Single Enthalpy and Dual Enthalpy High Limit Curves.
Two-Speed Fan Operation
The later versions of the W7220 JADE™
controller have the capability to work with a
system using a 2-speed supply fan operated
by a 2-speed motor. The W7220 does not
control the supply directly but uses the
following input status to determine the speed
of the supply fan and controls the OA damper
to the required position.
The W (heating mode) is not controlled by the
W7220 but it requires the status to know
where to position the OA for minimum position
for the fan speed.
The 2 speed fan delay is available when the
system is programmed for 2 speed fan (in the
System Setup menu item). The 2 speed fan
delay is defaulted to 5 minutes and can be
changed in the Advanced Setup menu item.
When the unit has a call for Y1 In and in the
free cooling mode and there is a call for Y2 In,
the 2-speed fan delay starts and the OA
damper will modulate 100% open, the supply
fan should be set to high speed by the unit
controller. After the delay one of two actions
will happen:
Enthalpy
Curve
Temp. Dry-
Bulb (°F)
Temp. Dew
point (°F)
Enthalpy
(btu/lb/da)
Point P1 Point P2
Temp. °F Humidity %RH Temp. °F Humidity %RH
ES1 80.0 60.0 28.0 80.0 36.8 66.3 80.1
ES2 75.0 57.0 26.0 75.0 39.6 63.3 80.0
ES3 70.0 54.0 24.0 70.0 42.3 59.7 81.4
ES4 65.0 51.0 22.0 65.0 44.8 55.7 84.2
ES5 60.0 48.0 20.0 60.0 46.9 51.3 88.5
HL 86.0 66.0 32.4 86.0 38.9 72.4 80.3
ECONOMIXING
AVAILABLE
NOT AVAILABLE
TEMPERATURE
ABSOLUTE HUMIDITY
RA TEMP
R
A
H
U
M
(
%
R
H
)
ENTHALPY
ES4 ES3 ES2 ES1 HL
P2 (T,RH)
DUAL ENTHALPY
HIGH LIMIT
SINGLE ENTHALPY
ES5
P1
(T,RH)
M32286A
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