38
Table 20 — Single Enthalpy and Dual Enthalpy High Limit Curves
TWO-SPEED FAN OPERATION —
The W7220 control-
ler has the capability to work with a system using a 2-speed sup-
ply fan. 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, see Ta-
Table 21 — Fan Speed
The W (heating mode) is not controlled by the W7220 but it
requires the status to know where to position the OA damper for
minimum position for the fan speed.
The 2 speed fan delay is available when the system is pro-
grammed 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 con-
troller.
After the delay one of two actions will happen:
• The Y2 In call will be satisfied with the damper 100%
open and fan on high speed and the call will turn off
OR
• If the call for additional cooling in the space has not been
satisfied then the first stage of mechanical cooling will be
enabled through Y1 Out or Y2 Out.
CHECKOUT —
Inspect all wiring connections at the econo-
mizer module’s terminals, and verify compliance with the instal-
lation wiring diagrams.
For checkout, review the Status of each configured parameter
and perform the Checkout tests.
NOTE: See “Interface Overview” on page 28 for information
about menu navigation and use of the keypad.
Power Up — After the W7220 module is mounted and wired,
apply power.
Initial Menu Display — On initial start up, Honeywell displays
on the first line and Economizer W7220 on the second line. After
a brief pause, the revision of the software appears on the first line
and the second line will be blank.
Power Loss (Outage or Brownout) — All setpoints and ad-
vanced settings are restored after any power loss or interruption.
NOTE: All settings are stored in non-volatile flash memory.
Status — Use the Status menu (see Table 10) to check the pa-
rameter values for the various devices and sensors configured.
NOTE: See “Interface Overview” on page 28 for information
about menu navigation and use of the keypad.
Checkout Tests — Use the Checkout menu (in Table 10) to test
the damper operation and any configured outputs. Only items
that are configured are shown in the Checkout menu.
NOTE: See “Interface Overview” on page 27 for information
about menu navigation and use of the keypad.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu using the
▲
and
▼
buttons.
2. Press the
button to select the item. RUN? appears.
3. Press the
button to start the test. The unit pauses and
then displays IN PROGRESS. When the test is complete,
DONE appears.
4. When all desired parameters have been tested, press the
(Menu Up) button to end the test.
The Checkout tests can all be performed at the time of instal-
lation or at any time during the operation of the system as a test
that the system is operable.
TROUBLESHOOTING
Alarms — The economizer module provides alarm messages
that display on the 2-line LCD.
NOTE: Upon power up, the module waits 60 minutes before
checking for alarms. This allows time for all the configured
devices (e.g. sensors, actuator) to become operational. The
exception is the SAT sensor which will alarm immediately.
If one or more alarms are present and there has been no key-
pad activity for at least 5 minutes, the Alarms menu displays and
cycles through the active alarms.
You can also navigate to the Alarms menu at any time.
ENTHALPY
CURVE
TEMP. DRY
BULB (F)
TEMP.
DEWPOINT (F)
ENTHALPY
(btu/lb/da)
POINT P1
POINT P2
TEMP. (F)
HUMIDITY
(%RH)
TEMP. (F)
HUMIDITY
(%RH)
ES1
80
60
28.0
80
36.8
66.3
80.1
ES2
75
57
26.0
75
39.6
63.3
80.0
ES3
70
54
24.0
70
42.3
59.7
81.4
ES4
65
51
22.0
65
44.8
55.7
84.2
ES5
60
48
20.0
60
46.9
51.3
88.5
HL
86
66
32.4
86
38.9
72.4
80.3
STATE
FAN SPEED
OCC
Low
Y1
Low
Y2
High
W
High
WARNING
Failure to follow this warning could result in personal
injury, property damage, or death.
Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lock(s) and lockout tag(s). Unit may have more than one
power switch. Ensure electrical service to rooftop unit
agrees with voltage an amperage listed on the unit rating
plate.
If any wiring changes are required, first be sure to re-
move power from the economizer module before starting
work. Pay particular attention to verifying the power con-
nection (24 Vac).
Summary of Contents for LEGACY 580J*20M Series
Page 4: ...4 Fig 2 Unit Dimensional Drawing 17 and 20 Size Unit...
Page 5: ...5 Fig 2 Unit Dimensional Drawing 17 and 20 Size Unit cont...
Page 6: ...6 Fig 3 Unit Dimensional Drawing 24 and 28 Size Unit...
Page 7: ...7 Fig 3 Unit Dimensional Drawing 24 and 28 Size Unit cont...
Page 8: ...8 Fig 4 Unit Dimensional Drawing 30 Size Unit...
Page 9: ...9 Fig 4 Unit Dimensional Drawing 30 Size Unit cont...
Page 13: ...13 Fig 8 Roof Curb Details 17 and 20 Size Units 17 20...
Page 14: ...14 Fig 9 Roof Curb Details 24 and 28 Size Units 24 28...
Page 15: ...15 Fig 10 Roof Curb Details 30 Size Units 30...
Page 25: ...25 Fig 33 Typical Perfect Humidity Adaptive Dehumidification System Humidistat Wiring...
Page 40: ...40 Fig 41 Typical RTU Open System Control Wiring Diagram...
Page 41: ...41 Fig 42 Typical RTU Open System Control Wiring Diagram with Perfect Humidity System...
