Carrier CRECOMZR074A01 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480147-01 Printed in U.S.A. Form IIK-CRECOMZR74-04 Pg 1 9-21 Replaces: IIK-CRECOMZR74-03
Installation Instructions
Part No: CRECOMZR074A01 and CRECOMZR075A01
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Vertical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . 6
Barometric Hood Assembly . . . . . . . . . . . . . . . . . . . . 7
• BAROMETRIC HOOD (VERTICAL CONFIGURATION)
• BAROMETRIC HOOD (HORIZONTAL
CONFIGURATION)
Vertical and Horizontal Applications . . . . . . . . . . . . . 8
Wiring Instructions for 1 and 2 Speed Units . . . . . . 9
EconoMi$er X System . . . . . . . . . . . . . . . . . . . . . . . . 13
• W7220 ECONOMIZER CONTROLLER
• USER INTERFACE
• KEYPAD
• USING THE KEYPAD WITH MENUS
• USING THE KEYPAD WITH SETTINGS AND
PARAMETERS
• MENU STRUCTURE
• CHECKOUT TESTS
SETUP AND CONFIGURATION . . . . . . . . . . . . . . . . 19
W7220 Economizer Module Wiring . . . . . . . . . . . . . 19
Timeout and Screen Saver . . . . . . . . . . . . . . . . . . . . 20
HH79AH001 Dry Bulb Sensor . . . . . . . . . . . . . . . . . . 20
Enthalpy Settings (Enthalpy Optional) . . . . . . . . . . 20
Enthalpy Control Sensor Configuration . . . . . . . . . 21
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cooling, Unit with EconoMi$er X System . . . . . . . . 22
Heating with EconoMi$er X System . . . . . . . . . . . . 22
Demand Controlled Ventilation (DCV) . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Loss (Outage or Brownout) . . . . . . . . . . . . . 23
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Clearing Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SAFETY CONSIDERATIONS
Installation of this accessory can be hazardous due to system
pressures, electrical components, and equipment location (such as
a roof or elevated structure). Only trained, qualified installers and
service technicians should install, start-up, and service this
equipment.
When installing this accessory, observe precautions in the
literature, labels attached to the equipment, and any other safety
precautions that apply:
• Follow all safety codes
• Wear safety glasses and work gloves
• Use care in handling and installing this accessory
It is important to recognize safety information. This is the safety-
alert symbol: . When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
GENERAL
The EconoMi$er® X system utilizes the latest technology
available for integrating the use of free cooling with mechanical
cooling for packaged rooftop units. The solid-state control system
optimizes energy consumption, zone comfort, and equipment
cycling by operating the compressors when the outdoor-air
temperature is too warm, integrating the compressor with outdoor
air when free cooling is available, and locking out the compressor
when outdoor-air temperature is too cold. Demand control
ventilation is supported.
This EconoMi$er X system can be used with 1, 2, or 3 speed
(48/50LC 14) units.
CAUTION
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing, safety glasses, and
gloves when handling parts and servicing rooftop units.
CAUTION
Failure to follow this caution may result in personal injury and
damage to the unit. Cover the duct opening as a precaution so
objects cannot fall into the return duct opening. Be sure to
remove the cover when installation is complete.
WARNING
Electrical shock can cause personal injury and death. Shut off
all power to this equipment during installation. There may be
more than one disconnect switch. Tag all disconnect locations
to alert others not to restore power until work is completed.
Medium Rooftop Units
12.5 to 27.5 Tons
Ultra Low Leak EconoMi$er®X Accessory

2
The EconoMi$er X system utilizes gear-drive technology with a
direct-mount spring return actuator that will close upon loss of
power. The EconoMi$er X system comes standard with an
outdoor air temperature sensor, mixed air temperature sensor (also
called supply air temperature sensor). Outdoor enthalpy, indoor
(return) dry bulb or enthalpy, and CO2 sensors are available for
field installation.
Standard barometric relief dampers provide natural building
pressurization control. An optional power exhaust system is
available for applications requiring even greater exhaust
capabilities. The power exhaust set point is adjustable at the
EconoMi$er X controller.
See Tables 1-3 for package usage. See Table 4 for package
contents. See Table 5 for sensor usage.
Compliance
Economizers meet California Energy Commission Title 24-2016
prescriptive section 140.4 (damper leakage etc.), and mandatory
section 120.2.i for Fault Detection and Diagnostic controls.
Economizers meet ASHRAE 90.1-2016 damper leakage
requirements as stated in Section 6.5.1.1.4 and Table 6.4.3.4.3,
and meet 2016 Fault Detection and Diagnosis requirements in
section 6.4.3.12.
Economizers meet IECC 2012 section C402.4.5.2 and, IECC
2015 sections C403.2.4.3 and C403.3.3.5 for outside air, return
air, and relief air damper leakage requirements, and IECC 2015
section C403.2.4.7 for Fault Detection and Diagnostic
requirements.
NOTE: IECC 2015 section C403.2.4.7.1 requires differential
return air sensor, which must be ordered separately.
Relief air, outside air, and return air (volume) dampers are AMCA
rated.
IMPORTANT: Read these instructions completely before
attempting to install the accessory economizer.
Table 1 — Carrier Usage Chart
CARRIER MODEL NUMBER ECONOMI$ER® X PART
NUMBER
48/50TC 17-24
CRECOMZR074A00
48/50HC 17-20
48/50LC 14
48/50TCQ 17-24
48/50TC 28-30
CRECOMZR075A0048/50HC 24-28
48/50LC 16-26
Table 2 — Bryant Usage Chart
BRYANT MODEL NUMBER ECONOMI$ER X® PART
NUMBER
580J, 558J 17-24
CRECOMZR074A00581J, 551J 17-20
548J 17-24
580J, 558J 28 CRECOMZR074A00
581J, 551J 24-28
Table 3 — ICP Usage Chart
ICP MODEL NUMBER ECONOMI$ER X® PART
NUMBER
RGS, RAS 181, 183, 210, 213, 240, 243
CRECOMZR074A00RGH, RAH 181, 210
RHS 181, 240
RGS, RAS 300, 303, 336 CRECOMZR075A00
RGH, RAH 240, 300
Table 4 — Package Contents
ECONOMIZER PART
NUMBER QTY CONTENTS
CRECOMZR074A01
1 Damper Assembly with Shroud
1 Upper End Economizer Panel
1Bottom Panel with Relief Damper
(for vertical only)
1
Bottom Panel #2 with Return Duct
Opening
(for horizontal only)
1Side Replacement Panel
(for horizontal only)
3 Filter Supports
3 Central Retainer
1 Hood Top
1 Left Hood Side
1 Right Hood Side
2 Side Retainer
2 Top Diverters
3 Deflector
4 Outside Air Filter Screens
1Mixed (Supply) Air Temperature
Sensor HH79AH001 and Harness
1 50HEHMRAE-A10 Harness
1
Parts Bag with W7220 Controller
with 50HEHMRAE-A00 Harness
Attached
60 Screws #10 - 16 in. x 7/8 in.
14 ft Seal Strip 1/8 in. x 3/4 in.
CRECOMZR075A01
1 Damper Assembly with Shroud
1 Upper End Economizer Panel
1Bottom Panel with Relief Damper
(for vertical only)
1
Bottom Panel #2 with Return Duct
Opening
(for horizontal only)
1Side Replacement Panel
(for horizontal only)
3 Filter Supports
3 Central Retainer
1 Hood Top
1 Left Hood Top
1 Right Hood Top
2 Side Retainer
2 Top Diverters
3 Deflector
4 Outside Air Filter Screens
1Mixed (Supply) Air Temperature
Sensor HH79AH001 and Harness
1 50HEHMRAE--A10 Harness
1
Parts Bag with W7220 Controller
with 50HEHMRAEH-A00 Harness
Attached
60 Screws #10 - 16 in. x 7/8 in.
14 ft Seal Strip 1/8 in. x 3/4 in.

3
*Accessory CO2 sensors.
†Accessory aspirator boxes required for duct-mounted applications.
**CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
INSTALLATION
Figure 1 shows component locations on the EconoMi$er X
system.
Vertical Installation
These economizers are designed to work in both vertical and
horizontal applications. These instructions are for vertical
installations.
1. Turn off unit power supply and install lockout tag.
2. Prepare the unit for economizer installation:
a. For units with 2 position damper installed, remove the
outside air hood. Unplug the damper actuator and
remove assembly from the unit.
b. For units with manual damper installed, remove the
manual damper and hood.
3. Remove the upper panel and bottom panel (provided with the
HVAC unit) on the end of the unit to expose the return
section. (See Fig. 2.) Save the screws for use later when
replacing the panel. The panels can be discarded.
Fig. 1 — EconoMi$er X System Component
Locations
Fig. 2 — Upper and Bottom Panel on End of Unit
4. Remove the unit’s left side corner post and left side panel
from the unit to allow for easy economizer installation. (See
Fig. 3.)
5. Install economizer, with shroud attached as shown in Fig. 3,
into the return air section of the unit. Be careful not to pinch
the wires during installation. The bottom of the economizer
will rest on the base of the unit. (See Fig. 4.)
6. Reinstall the left side corner post on to the unit. NOTE: The
corner post will sit behind the economizer shroud flange (see
Fig. 5). Screw through the corner post and through the
economizer shroud. (See Fig. 4 and 5.)
Fig. 3 — Unit Left Side Panel and Corner Post
Fig. 4 — Side View
Table 5 — EconoMi$er X®Sensor Usage
APPLICATION
ECONOMI$ER X® WITH OUTDOOR AIR DRY
BULB SENSOR
Accessories Required
Outdoor Air Dry
Bulb
The HH79AH001 outdoor air dry bulb sensor is
factory installed on the economizer.
Mixed Air
Sensor
HH79AH001 provided with economizer and
field-installed in blower compartment.
Single Enthalpy HH57AC081
Differential Dry
Bulb or
Enthalpy
HH57AC081
CO2 for DCV
Control using a
Wall-Mounted
CO2 Sensor
33ZCSENCO2
OR
CGCDXSEN004A00
CO2 for DCV
Control using a
Duct-Mounted
CO2 Sensor
33ZCSENCO2 OR
CGCDXSEN004A00*
and
33ZCSENCO2
OR
CGCDXASP00100†
OR
CRCBDIOX005A00**
Outside Air
Damper
Economizer
Actuator
(This End)
Wiring
Harness
Return Air Damper
Upper End Panel
Shipped On
Base Unit
Bottom Panel
Shipped On
Base Unit
Indoor Fan Panel
Unit’s Left
Side Panel
Economizer
Shroud
Left
Corner
Post
EconoMi$er X
EconoMi$er X
Shroud
Screw
Economizer
To Base
Economizer
A
ctuator

4
Fig. 5 — Top View
7. Insert provided screw through the bottom left rear of the
economizer and into the unit base. (See Fig. 5 and 6.)
Reinstall the unit’s left side panel.
Fig. 6 — Front Left View
8. Before the economizer is secured in place on the right hand
side, remove and save the 12-pin jumper plug from the unit
wiring harness. Insert the economizer plug into the unit wir-
ing harness plug. (See Fig. 7.)
NOTE: The 12-pin jumper plug should be saved for future
use in the event that the EconoMi$er X system is removed
from the unit. The jumper plug is not needed as long as the
EconoMi$er X system is installed.
Fig. 7 — Harness and Jumper Plug
9. Install the bottom panel with the relief damper attached on the
unit. (See Fig. 8.) Screw the panel in place.
NOTE: Remove the bottom screw holding the relief blade
closed.
NOTE: Access to the economizer actuator is through the
HVAC unit’s left side panel.
Fig. 8 — Bottom Panel Installation
10. Install the upper end economizer panel over the economizer’s
outside air damper, and above the bottom panel. Screw panel
in place and screw panel into economizer in two places. (See
Fig. 9.)
Fig. 9 — End View of Unit
11. Locate the mixed (supply) air temperature sensor
(HH79AH001) in the economizer hardware bag. A 2-wire
sensor harness with spade terminals is supplied with the
sensor. Plug the harness into the top of the HH79AH001
sensor. See Fig. 10 for sensor image. Mount the sensor in the
indoor fan section of the unit. (See Fig. 11.) Locate the orange
and brown wires in the wire bundle in the indoor fan section.
Connect these orange and brown wires to the 2-wire harness
attached to the HH79AH001 sensor. Mixed air default setting
is 53°F and can be adjusted from 38° to 70°F.
Fig. 10 — Dry Bulb and Mixed Air Sensor —
HH79AH001
Units Left
Side Panel
Left Front
Corner Post
Screw Economize
r
Flange
Economizer Shroud
Economizer Outside
Air Damper
Insert
Screw
Left Front
Corner Post
Insert
Screw
Jumper Plug
(Remove)
Harness/Plug
From Economizer
Harness/Plug
From HVAC
Remove Shipping
Screw
Bottom Panel
With Relief
Damper
Upper
Economizer
Panel
Shroud
EconoMi$er X
Economizer
Actuator
Relief Damper
Provided
Upper Panel
Economizer
Outside Air
Damper
Provided
Bottom Panel
With Relief Relief Damper Remove
Shipping
Screw
Insert two (2) screws through the
panel and into the economizer
Honeywell
HH79AH001

5
NOTE: Sensor will vary from illustration depending on control system.
Fig. 11 — Supply Air Sensor Placement
12. Assemble the outside air hood per Fig. 12-14.
a. Install filter supports (Item #1) to the upper end panel
using the screws provided.
b. Install each deflector (Item #8) on to each filter support
(Item #1) using the screws provided. (See Fig. 12.)
c. Apply seal strip to mating flanges on side plates of hood
(Items #4 and #5).
d. Secure side panels (Items #4 and #5) to upper panel.
e. Apply seal strip to mating flange of the hood.
(See Fig. 12.)
f. Secure hood top (Item #3) to upper panel using the
screws provided. NOTE: On 44 in. chassis, remove the
screws from across top cover of unit. The rear flange of
hood top will slide behind unit top over flange.
g. Secure side retainers (Item #6) to side panels (Item #4
and #5) using the screws provided, screwing from
outside of the hood.
h. Secure each central retainer (Item #2) to the hood top
(Item #3). Align central retainers to holes located on
filter support (Item #1), so that central retainer is
perpendicular to hood and each filter support. Secure
using screws provided.
i. Apply seal strip to top diverters (Item #7).
j. Secure top diverters (Item #7) to hood top (Item #3).
k. Install outdoor air screens by sliding them into each of
the 4 spaces created by the hood, filter support and cen-
tral retainers. First insert the air screen into the pocket
created at the end of the hood (Item #3). Then put the air
screen completely into place, slide them back into pocket
created in the filter support (Item #1). NOTE: Repeat for
each air screen. See Fig. 13 for completed hood
assembly.
13. Install the hood assembly on the unit. (See Fig. 14.)
14. Install the hood screens and other approved EconoMi$er X
accessories.
Fig. 12 — Hood Assembly
Supply Air
Temperature
Sensor
Mounting
Location
ITEM # DESCRIPTION QTY
1Filter Supports 3
2Central Retainer 3
3Hood Top 1
4Left Hood Side 1
5Right Hood Side 1
6Side Retainer 2
7Top Diverters 2
8Deflectors 3
Apply seal strip
to the front of
this flange
Apply seal strip
to the back
of this flange
Apply seal strip
to the back
of this flange Apply seal strip
to the back
of this flange
7
7
3
5688
2
8
6
4
2
1
2

6
Fig. 13 — Hood Assembly — Completed
Fig. 14 — Hood Assembly Installed
Horizontal Installation
These economizers are designed to work in both vertical and
horizontal applications. These instructions are for horizontal
applications.
The unit has a horizontal duct opening next to the horizontal
supply duct opening. However, in this application, with an
economizer, the horizontal duct will actually come into the unit
underneath the outdoor air hood. (See Fig. 15.)
Fig. 15 — Install Bottom Panel with Horizontal Return
Duct Opening
1. Turn off unit power supply and install lockout tag.
2. Prepare the unit for economizer installation:
a. For units with 2 position damper installed, remove the
outside air hood. Unplug the damper actuator and
remove assembly from unit.
b. For unit with manual damper installed, remove the
manual damper and hood.
3. Remove the upper panel and bottom panel (provided with the
HVAC unit). On the end of the unit to expose the return
section. (See Fig. 2.) Save the screws for use later when
replacing the panel. The panels can be discarded.
4. Remove the unit’s left side corner post and left side panel
from the unit to allow for easy economizer installation. (See
Fig. 16.)
NOTE: The unit’s left side panel has a duct opening in it, but
this panel/duct opening will not be used in this application
and can be discarded.
Fig. 16 — Remove Unit Corner Post and Side Panel
5. Install economizer with shroud attached, as shown in Fig. 3,
into the return air section of the unit. Be careful not to pinch
the wires during installation. The bottom of economizer will
rest on the base of the unit. (See Fig. 4.)
6. Reinstall the left side corner post on the unit. Note the corner
post will sit behind the economizer shroud flange. Screw
through the corner post and through the economizer shroud.
(See Fig. 5 and 6.)
7. Insert provided screw through the bottom left rear of the
economizer and into the unit base. (See Fig. 4). Install the
new (provided) left side panel without the duct opening on
the unit.
8. Before the economizer is secured in place on the right hand
side, remove and save the 12-pin jumper plug from the unit
wiring harness. Insert the EconoMi$er X plug into the unit
wiring harness plug. (See Fig.7.)
NOTE: The 12-pin jumper plug should be saved for future
use in the event that the EconoMi$er X is removed from the
unit. The jumper plug is not needed as long as the
EconoMi$er X is installed.
9. Install the bottom panel (provided) with the horizontal return
duct opening on the unit (see Fig. 15 and 17). Screw the panel
into place.
10. Install the upper end economizer panel in place over the econ-
omizer’s outside air damper, and above the bottom panel.
Screw panel in place and screw panel into the economizer in
2 places.
11. Locate the mixed (supply) air temperature sensor
(HH79AH001) in the economizer hardware bag. A 2-wire
sensor harness with spade terminals is supplied with the sen-
sor. Plug the harness into the top of the HH79AH001 sensor.
Mount the sensor in the indoor fan section of the unit. Locate
the orange and brown wires in the wire bundle in the indoor
fan section. Connect these orange and brown wires to the
2-wire harness attached to the HH79AH001 sensor. Mixed air
default setting is 53°F and can be adjusted from 38°F to 70°F.
Assemble the outside air hood per Fig. 12 and 13.
a. Install four hood angles to the upper end panel using the
screws provided.
b. Apply seal strip to mating flanges on the side plates of
the hood and the hood top.
Outdoor
Air Hood
Relief Damper
Bottom Panel With
Return Duct Opening
Unit’s Left Side
Panel With
Duct Opening
Left Front
Corner Post

7
c. Secure the hood side plates to the panel using screws
provided.
d. CRECOMZR074A00: Remove screws across top cover.
Attach hood top to hood side plates. (Flange will slide
behind flange of top cover.)
e. CRECOMZR074A00: Reinstall the screws previously
removed. CRECOMZR075A00: Secure top flange using
the screws provided in the kit.
f. Install the four outdoor air screens by sliding then into
the channel formed by the four angles installed previ-
ously. Make sure the screens extend across the entire
length of the hood.
g. Install the side filter supports using the provided screws.
h. Install the side drip edge angles using the provided
screws.
i. Run a continuous length of seal strip across the hood
covering the engagement hole in the lower hood.
j. Install the top diverter using the provided screws.
12. Install the hood assembly onto the unit. (See Fig. 12.)
13. If barometric relief is required, remove the relief damper and
hinges from the (provided) bottom panel used on vertical
applications. Reinstall the hinges and damper on the side of
the field-supplied return duct. (See page 8.)
NOTE: A relief hood for the horizontal application can be ordered
separately (part number CRBARHOD001A00) or can be
field-supplied.
14. Install the hood screens and other approved EconoMi$er X
accessories.
Fig. 17 — End View
Barometric Hood Assembly
The barometric hood can be assembled in vertical or horizontal
configuration. Figure 18 illustrates the barometric hood parts.
Fig. 18 — Barometric Hood Parts
BAROMETRIC HOOD (VERTICAL CONFIGURATION)
1. Remove the hood top panel from its shipping position on the
unit end. (See Fig. 19.)
Fig. 19 — Shipping Location, Vertical Units
2. Remove the side panels located in the hood parts box. (See
Fig. 20.)
Fig. 20 — Barometric Hood Box Parts Location
3. Install parts as shown in the following exploded view. (See
Fig. 21.) using the seal strip and screws provided in the parts
box.
Fig. 21 — Barometric Hood Exploded View
Figure 22 illustrates the installed barometric hood parts.
18 3/8"
Provided
Upper Panel
Economizer Outside
Air Damper
Economizer actuator
access through left
side panel
Provided bottom panel
with return duct opening
61 9/16"

8
Fig. 22 — Installed Barometric Hood Side View and
Isometric View
BAROMETRIC HOOD (HORIZONTAL CONFIGURATION)
For horizontal return and field installed economizer, install the
economizer as follows:
1. Install the field provided horizontal ductwork onto the unit.
Duct height must be at least 19-1/2 in. high, however the duct
can be no taller than the top of the relief opening in the
bottom panel, or airflow into the outside air hood will be
restricted. (See Fig. 23.)
Fig. 23 — Relief Damper
2. Cut a 16 in. x 36 in. opening in the return duct for the relief
damper. (See Fig. 23.)
3. On the field installed economizer (CRECOMZR0**A00), a
birdscreen or hardware cloth is shipped attached to the
bottom panel used for vertical applications.
NOTE: This panel is not used for horizontal return applications.
Remove the screen from the provided panel and install it over the
relief opening cut in return duct.
4. Using the blade brackets, install the relief damper onto the
side of the return duct. (See Fig. 24.) The two brackets and
relief damper are provided with the economizer.
5. Using the provided hardware, screw the
CRBARHOD001A00 hood sides and top together. (See
Fig. 25.)
Caulk the backside of the mating flanges to ensure a watertight
seal. Install the CRBARHOD001A00 over the relief damper and
screw to the return duct, as illustrated in Fig. 24 and 26.
Fig. 24 — Installing CRBARHOD001A00 Over Relief
Damper
Fig. 25 — CRBARHOD001A00 Hood Sides and Top
Fig. 26 — Reinstall Hinges and Damper on Return
Vertical and Horizontal Applications
1. The W7220 EconoMi$er X controller is shipped mounted to
a bracket. Install the controller/bracket in the unit control box
as shown in the wiring diagram. Screw in place through pre-
punched holes.
2. For 1 and 2 speed units connect the plugs coming from the
controller as shown in Fig. 27 and 28.
3. For 3 speed (48/50LC 14-26) units, the harness attached to
the W7220 EconoMi$er X controller must be removed, and
can be discarded. Locate the 48LCHSRADH--A00 harness
shipped in plastic bag in control box of unit. Attach this har-
ness to the W7220 controller as shown in Fig. 27, 29, and 30.
NOTE: The 50HEHMRAEH-A00 harness shipped attached to the
W7220 controller will not be used with 3 speed (LC14-26) units
Unit
Outside
Air Hood
Min
19 1/2"
Relief
Opening Return Duct
16"
1"
18 3/8"
Outdoor Air
Hood
CRBARHOD001A00
Relief Hood
Ordered Separately
Field Supplied
Return Duct
Relief Damper

9
and can be removed from the W7220 and discarded. Follow all
local and other applicable codes.
Wiring Instructions for 1 and 2 Speed Units
1. Install W7220 (with harnesses attached) in unit top left of
control box. See wiring diagram in instructions.
2. Mount supply air temperature (SAT) sensor, with 2 wire SAT
harness attached, in the indoor blower section.
3. Unplug the EconoMi$er X harness from PL6 with 10-pin
plug shown in Fig. 27, from Central Terminal Board (CTB).
4. Attach 10-pin plug disconnected from (CTB) to 10-pin plug
harness from W7220 controller.
5. Connect other 10-pin plug from W7220 controller into
ECONO terminals on CTB. (See Fig. 27.)
6. Inside control box – connect 4-pin plug from the W7220
controller to the 4-pin 50HEHMRAE--A10 harness provided
with economizer accessory.
7. Inside the control box – the brown and orange wires with
male terminals from the 50HEHMRAE--A10 harness
connect to the female terminals on the pink and violet wires
from the PL6 harness.
8. Inside the control box – connect the pink and violet wires
with female terminals on 50HEHMRAE--A10, to the pink
and violet wires with male terminals from the PL6 harness.
9. Inside the Indoor Blower Section connect the pink and violet
wires from the PL6 harness to the (2) green wires leading to
the SAT.
Fig. 27 — Harness Detail
PL6
SAT
ORN
BRN
CONTROL BOX
CENTRAL
TERM.BRD
.
ECONO
W7720
48TMHSRSE--A20
SEE DETAIL
Unplug the 10-pin plug from
Pl6 from the central terminal
Board (in control box) and plug
Into 10-pin plug from W7220.
Plug 10-pin from
W7220 into econo
Terminals on central
Terminal board.
INDOOR BLOWER
SECTION
CONNECT SAT SENSOR AND PINK
AND VIOLET WIRES FROM PL6 TO
THE 48TMHSRSE--A20
HARNESS.
HARNESS WITH 4-PIN
PLUG
ECONOMIZER X

10
Fig. 28 — Typical EconoMi$er X Wiring Diagram for 1 and 2 Speed Units

11
Fig. 29 — Typical EconoMi$er X Wiring Diagram for 3 Speed Units
(See 3 Speed Unit Instructions for Complete Diagram)
NOTES:
1. Wires shown in bold are part of 48LCHSRADH--A00 harness which is provided with 48/50LC 14-26 size with 3 speed units.
2. Harness 50HEHMRAEH-A00 which is provided with economizer accessory is not used on 3 speed units.

12
Fig. 30 — 48LCHSRADH-A00 Harness for 3 Speed Units (48/50LC 14-26)
(Provided with 3 Speed Units, Field Attached to W7220 Controller)
FIELD ATTACH TO W7220 CONTROLLER
CONNECT TO UNIT
TERMINAL BOARD
CONNECT TO
UNIT TERMINAL
BOARD

13
EconoMi$er X System
The field-installed accessory consists of the following:
• Low leak economizer assembly
• HH79AH001 OA Dry Bulb Sensor
• HH79AH001 Mixed Air Sensor and Harness
• W7220 Controller
• 50HEHMRAE--A10 Harness (not used on 3 speed units)
W7220 ECONOMIZER CONTROLLER
The economizer controller used on electro-mechanical units is a
Honeywell W7220 which is to be located in the RTU base unit’s
control box. See Fig. 31 for button description of the W7220
controller. See the Installation Instruction for your base unit for
the location of the Control Box access panel.
USER INTERFACE
The user interface consists of a LCD display and a 4-button
keypad on the front of the economizer controller.
KEYPAD
The four navigation buttons (see Fig. 31) are used to scroll
through the menus and menu items, select menu items, and to
change parameter and configuration settings.
USING THE KEYPAD WITH MENUS
To use the keypad when working with menus:
• Press the ▲ (Up arrow) button to move to the previous
menu.
• Press the ▼ (Down arrow) button to move to the next
menu.
• Press the (Enter) button to display the first item in the
currently displayed menu.
• Press the (Menu Up/Exit) button to exit a menu’s item
and return to the list of menus.
USING THE KEYPAD WITH SETTINGS AND
PARAMETERS
To use the keypad when working with Setpoints, System and
Advanced Settings, Checkout Tests and Alarms:
1. Navigate to the desired menu.
2. Press the (Enter) button to display the first item in the
currently displayed menu.
3. Use the ▲ and ▼ buttons to scroll to the desired parameter.
4. Press the (Enter) button to display the value of the currently
displayed item.
5. Press the ▲ button to increase (change) the displayed
parameter value.
6. Press the ▼ button to decrease (change) the displayed
parameter value.
NOTE: When values are displayed, pressing and holding the
▲ or ▼ button causes the display to automatically increment.
7. Press the (Enter) button to accept the displayed value and
store it in nonvolatile RAM.
8. “CHANGE STORED” displays.
9. Press the (Enter) button to return to the current menu
parameter.
10. Press the (Menu Up/Exit) button to return to the previous
menu.
MENU STRUCTURE
Table 6 illustrates the complete hierarchy of menus and
parameters for the EconoMi$er X system.
The Menus in display order are:
• STATUS
• SETPOINTS
• SYSTEM SETUP
• ADVANCED SETUP
• CHECKOUT
• ALARMS
Fig. 31 — W7220 Controller

14
The W7220 controller provides the following:
• 2-line LCD interface screen for setup, configuration and
troubleshooting
• On-board fault detection and diagnostics
• Sensor failure loss of communications identification
• Automatic sensor detection
• Capabilities for use with multiple-speed indoor fan
systems
See Fig. 32 for wiring the W7220 controller for exhaust and fault
alarm.
Fig. 32 — Wiring W7220 Controller for Exhaust and Fault Alarm
IMPORTANT: The default setting on the W7220 controller is
for a “Fan Type” with 2 speed, which is correct for 2 or 3 speed
units (48/50LC 14-26). If your unit is 1 (single) speed, the
setting under SYSTEM SETUP > FAN TYPE must be changed
to 1 speed.
ROOF TOP UNIT
Y1O
Y2O
Y1I
Y2I
OCC
24 VAC
E-GND
Y1 G
W2
W1
Y2
O/B
OCC
W7220 ECONOMIZER CONTROLLER MODULE
THERMOSTAT
CO2
SENSOR
2-10 VDC
(OPTIONAL)
MAT
MAT
OAT
OAT
C R
R(+)
C(-)
IAQ (2-10V)
IAQ COM
IAQ 24V
ACT (2-10V)
ACT COM
ACT 24V
3
1
2
OAT TEMP
SENSOR
20K NTC
MS3103J
OR MS3105J
1
1
MA TEMP
SENSOR
20K NTC
S-BUS
4
5
S-BUS
AUX1-0
AUX2-I
NOTE THAT THE 20K NTC SENSOR CAN BE MOUNTED IN THE OAT TERMINALS ONLY IN THIS CONFIGURATION.
WHEN USING A HEAT PUMP THERMOSTAT, THERMOSTAT TERMINALS MAY DIFFER: W1 MAY BE LABELED O OR B AND W2 MAY BE LABELED W.
WHEN USING A HEAT PUMP WITH DEFROST FEEDBACK, ADD AN ISOLATION RELAY BETWEEN O AND C.
2
2
3
3
1K1
1K1
EXH1
EXHAUST
ANNUNCIATION –
LIGHT OR OTHER
C
24VAC
24VAC
WIRING W7220 FOR EXHAUST AND FAULT ALARM

15
Table 6 — Menu Structure
See Legend and notes on page 18.
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER RANGE AND
INCREMENT NOTES
STATUS
ECONO AVAIL NO YES/NO YES = economizing available; the system can use
outside air for free cooling when required
ECONOMIZING NO YES/NO YES = outside air being used for 1 stage cooling
OCCUPIED NO YES/NO
YES = OCC signal received from space thermostat or
unitary controller
YES = 24 Vac on terminal OCC
NO = 0 Vac on terminal OCC
HEAT PUMP N/A COOL
HEAT
Displays COOL or HEAT when system is set to heat
pump
(Non-conventional)
COOL Y1—IN OFF ON/OFF
Y1─I signal from space thermostat or unitary controller
for cooling stage 1.
ON = 24 Vac on terminal Y1─I
OFF = 0 Vac on terminal Y1─I
COOL Y1—OUT OFF ON/OFF
Cool stage 1 Relay Output to stage 1 mechanical
cooling
(Y1─OUT terminal)
COOL Y2—IN OFF ON/OFF
Y2─I signal from space thermostat our unitary
controller for second stage cooling.
ON = 24 Vac on terminal Y2─I
OFF = 0 Vac on terminal Y2─I
COOL Y2—OUT OFF ON/OFF Cool Stage 2 Relay Output to mechanical cooling
(Y2─OUT terminal)
MA TEMP _ _ . _ F 0 to 140 F
Displays value of measured mixed air from MAT
sensor.
Displays _ _ . _ F if not connected, short or out-of-
range.
DA TEMP _ _ . _ F 0 to 140 F
Displays when Discharge Air sensor is connected and
displays measured discharge temperature.
Displays _ _ . _F if sensor sends invalid value, if not
connected, short or out-of-range.
OA TEMP _ _ . _ F -40 to 140 F
Displays measured value of outdoor air temperature.
Displays _ _ . _F if sensor sends invalid value, short or
out-of-range.
OA HUM _ _ % 0 to 100%
Displays measured value of outdoor humidity from
OA sensor.
Displays _ _% if not connected short, or out-of-range.
RA TEMP _ _ . _ F 0 to 140 F
Displays measured value of return air temperature from
RAT sensor.
Displays _ _ . _ F if sensor sends invalid value, if not
connected, short or out-of-range
RA HUM _ _ % 0 to 100%
Displays measured value of return air humidity from
RA sensor.
Displays _ _% if sensor sends invalid value, if not
connected, short or out-of-range
IN CO2 _ _ _ ppm 0 TO 2000 ppm Displays value of measured CO2 from CO2 sensor.
Invalid if not connected, short or out-of-range
DCV STATUS N/A ON/OFF Displays ON if above setpoint and OFF if below
setpoint, and ONLY if a CO2 sensor is connected.
DAMPER OUT 2.0v 2.0 TO 10.0v Displays voltage output to the damper actuator.
EXH1 OUT OFF ON/OFF
Output of EXH1 terminal:
ON = relay closed
OFF = relay open
EXH2 OUT OFF ON/OFF Output of AUX terminal; displays only if AUX = EXH2
ERV OFF ON/OFF Output of AUX terminal; displays only if AUX = ERV
MECH COOL ON 0 0, 1, or 2 Displays stage of mechanical cooling that is active.

16
Table 6 — Menu Structure (cont)
See Legend and notes on page 18.
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER RANGE AND
INCREMENT NOTES
SETPOINTS
MAT SET 53°F 38°F to 65°F; increment by 1 Setpoint determines where the economizer will modulate the
OA damper to maintain the mixed air temperature.
LOW T LOCK 32°F -45°F to 80°F;
increment by 1
Setpoint determines outdoor temperature when the
mechanical cooling cannot be turned on. Commonly referred
to as the Compressor lockout.
DRYBLB SET 63°F 48°F to 80°F; increment by 1
Setpoint determines where the economizer will assume
outdoor air temperature is good for free cooling; e.g.; at 63°F
unit will economize at 62°F and below and not economize at
64°F and above. There is a 2°F deadband.
ENTH CURVE ES3 ES1,ES2,ES3,ES4, or ES5 Enthalpy boundary “curves” for economizing using single
enthalpy.
DCV SET 1100ppm 500 to 2000ppm; increment
by 100
Displays only if CO2 sensor is connected. Setpoint for Demand
Control Ventilation of space. Above the setpoint, the OA
dampers will modulate open to bring in additional OA to
maintain a space ppm level below the setpoint.
MIN POS 4.4 V 2 to 10 Vdc Displays ONLY if a CO2 sensor is NOT connected.
VENTMAX
With 2-speed fan units
VENTMAX L (low speed
fan) and VENTMAX H
(high speed fan) settings
are required
4.4 V
2 to 10 Vdc
or
100 to 9990 cfm;
increment by 10
Displays only if a CO2 sensor is connected. Used for Vbz
(ventilation max cfm) setpoint. Displays 2 to 10 V if <3 sensors
(RA,OA, and MA). In AUTO mode dampers controlled by
CFM.
VENTMAX L 6 V N/A N/A
VENTMAX H 4.4 V N/A N/A
VENTMIN
With 2-speed
fan units VENTMIN L (low
speed fan) and VENTMIN
H (high speed fan) set
2.8 V 2 to 10 Vdc or 100 to 9990
cfm increment by 10
Displays only if a CO2 sensor is connected. Used for Ba
(ventilation min cfm) setpoint. Displays 2 to 10 V if <3 sensors
(RA, OA, and MA). Va is only set if DCV is used. This is the
ventilation for less than maximum occupancy of the space. In
AUTO mode dampers controlled by CFM.
VENTMIN L 3.7 V N/A N/A
VENTMIN H 2.8 V N/A N/A
ERV OAT SP 32°F 0 to 50F; increment by 1 Only when AUX1 O = ERV
EXH1 SET
With 2-speed fan units
Exh1 L (low speed fan)
and Exh1 H (high speed
fan) settings are required
50% 0 to 100%;increment by 1 Setpoint for OA damper position when exhaust fan 1 is
powered by the economizer.
Exh1 L 65% N/A N/A
Exh1 H 50% N/A N/A
EXH2 SET
With 2-speed fan units
Exh2 L (low speed fan)
and Exh2 H (high speed
fan) settings are required
75% 0 to 100%; increment by 1
Setpoint for OA damper position when exhaust fan 2 is
powered by the economizer. Only used when AUX is set to
EHX2.
Exh2 L 80% N/A N/A
Exh2 H 75% N/A N/A
SYSTEM SETUP
INSTALL 01/01/10 N/A Display order = MM/DD/YY
Setting order = DD, MM, then YY.
UNITS DEG F F or C Sets economizer controller in degrees Fahrenheit or Celsius
EQUIPMENT CONV Conventional or HP
CONV = conventional; HP O/B = Enable Heat Pump mode.
Use AUX2 I for Heat Pump input from thermostat or
controller.
AUX2 I W SD/W or HP(O)/HP(B)
In CONV mode: SD + Enables configuration of shutdown
(default); W = Informs controller that system is in heating
mode. In HP O/B mode: HP(O) = energize heat pump on Cool
(default); HP(B) = energize heat pump on heat.
FAN TYPE 2 speed 1 speed/2 speed
Sets the economizer controller for operation of 1 speed or 2
speed supply fan. (NOTE: for 3 speed units (48/50LC 14-26),
setpoint is a 2 speed.)
FAN CFM 5000cfm 100 to 15000 cfm;
increment by 100
This is the capacity of the RTU. The value is found in the
Project Submittal documents for the specific RTU.
AUX OUT NONE
NONE
ERV
EXH2
SYS
• NONE = not configured (output is not used)
• ERV = Energy Recovery Ventilator
• EXH2 = second damper position relay closure for second
exhaust fan
• SYS = use output as an alarm signal
OCC INPUT INPUT or ALWAYS
When using a setback thermostat with occupancy out (24
vac), the 24 vac is input “INPUT” to the OCC terminal. If no
occupancy output from the thermostat then change program to
“ALWAYS” OR add a jumper from terminal R to OCC
terminal.
FACTORY DEFAULT NO NO or YES
Resets all set points to factory defaults when set to YES. LCD
will briefly flash YES and change to NO but all parameters will
change to the factory default values.

17
Table 6 — Menu Structure (cont)
See Legend and notes on page 18.
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER RANGE AND
INCREMENT NOTES
ADVANCED
SETUP
MA LO SET 45°F35°F to 55°F;
Incremented by 10
Temperature to achieve Freeze Protection (close
damper and alarm if temperature falls below setup
value).
FREEZE POS CLO CLO or MIN Damper position when freeze protection is active
(closed or MIN POS).
CO2 ZERO 0ppm 0 to 500 ppm; Increment by
10 CO2 ppm level to match CO2 sensor start level.
CO2 SPAN 2000ppm 1000 to 3000 ppm;
Increment by 10 CO2 ppm span to match CO2 sensor.
STG3 DLY 2.0h
0 min, 5 min, 15 min, then 15
min intervals. Up to 4 h or
OFF
Delay after stage 2 cool has been active. Turns on 2nd
stage of cooling when economizer is 1st stage and
mechanical cooling is 2nd stage. Allows three stages of
cooling, 1 economizer and 2 mechanical.
OFF = no Stage 3 cooling
SD DMPR POS CLO CLO or OPN
Indicates shutdown signal from space thermostat or
unitary controller. When controller receives 24 Vac
input on the SD terminal in conventional mode, the OA
damper will open if programmed for OPN and OA
damper will close if programmed for CLO. All other
controls, e.g., fans, etc. will shut off.
DCVCAL ENA MAN MAN (manual) AUTO
Turns on the DCV automatic control of the dampers.
Resets ventilation based on the RA, OA, and MA
sensor conditions. Requires all 3 RA, OA, and MA
sensors.
MAT T CAL 0.0°F ±2.5°FAllows for the operator to adjust for an out of calibration
temperature sensor.
OA T CAL 0.0°F ±2.5°FAllows for the operator to adjust for an out of calibration
temperature sensor.
OA H CAL 0% RH ±10% RH Allows for operator to adjust for an out of calibration
humidity sensor.
RA T CAL 0.0°F ±2.5°FAllows for the operator to adjust for an out of calibration
temperature sensor.
RA H CAL 0% RH ±10% RH Allows for operator to adjust for an out of calibration
humidity sensor.
DA T CA; 0.0°F ±2.5°FAllows for the operator to adjust for an out of calibration
temperature sensor.
CHECKOUT
DAMPER VMIN─HS N/A N/A Positions damper to VMIN position
DAMPER VMAX─HS N/A N/A Positions damper to VMAX position
DAMPER OPEN N/A N/A
Position damper to the full open position.
Exhaust fan contacts enable during the DAMPER
OPEN test. Make sure you pause in the mode to allow
exhaust contacts to energize due to the delay in the
system.
DAMPER CLOSE N/A N/A Positions damper to the fully closed position
CONNECT Y1─O N/A N/A Closes the Y1─O relay (Y1─O)
CONNECT Y2─O N/A N/A Closes the Y2─O relay (Y2─O)
CONNECT AUX N/A N/A
Energizes the AUX output. If Aux setting is:
• NONE ─ not action taken
• ERV ─ 24 Vac out. Turns on or signals an ERV that
the conditions are not good for economizing but are for
ERV operation.
• SYS ─ 24 Vac out. Issues a system alarm

18
Table 6 — Menu Structure (cont)
LEGEND NOTES:
1. Table 6 illustrates the complete hierarchy. Your menu parameters
may be different depending on your configuration. For example if
you do not have a DCV (CO2) sensor, then none of the DCV
parameters appear.
2. When values are displayed, pressing and holding the or
button causes the display to automatically increment.
3. N/A = Not Applicable.
4. ERV Operation: When in cooling mode AND the conditions are
NOT OK for economizing - the ERV terminal will be energized. In
the Heating mode, the ERV terminal will be energized when the
OA is below the ERV OAT setpoint in the setpoint menu.
MENU PARAMETER
PARAMETER
DEFAULT
VALUE
PARAMETER RANGE AND
INCREMENT NOTES
ALARMS
Alarms display only when they are active. The menu title “ALARMS(#)” includes the number of active alarms in parenthesis ( ). When using SYLK bus
sensors, “SYLK” will appear on the screen, and when using 20k OA temperature sensors, “SENS T” will appear on the screen
MA T SENS ERR N/A N/A Mixed air sensor has failed or become disconnected -
check wiring then replace sensor if the alarm continues.
CO2 SENS ERR N/A N/A
CO2 sensor has failed, gone out of range or become
disconnected - check wiring then replace sensor if the
alarm continues.
OA SYLK T ERR N/A N/A Outdoor air enthalpy sensor has failed or become
disconnected - check wiring then replace sensor if the
alarm continues.
OA SYLK H ERR N/A N/A
RA SYLK T ERR N/A N/A Return air enthalpy sensor has failed or become
disconnected - check wiring then replace sensor if the
alarm continues.
RA SYLK H ERR N/A N/A
DA SYLK T ERR N/A N/A
Discharge air sensor has failed or become
disconnected - check wiring then replace sensor if the
alarm continues.
OA SENS T ERR N/A N/A
Outdoor air temperature sensor has failed or become
disconnected - check wiring then replace if the alarm
continues.
ACT ERROR N/A N/A
Actuator has failed or become disconnected - check for
stall, over voltage, under voltage and actuator count.
Replace actuator if damper is movable and supply
voltage is between 21.6 V and 26.4 V. Check actuator
count on STATUS menu.
FREEZE ALARM N/A N/A
Check if outdoor temperature is below the LOW Temp
Lockout on setpoint menu. Check if Mixed air
temperature on STATUS menu is below the Low
Setpoint on Advanced menu. When conditions are back
in normal range then the alarm will go away.
SHUTDOWN ACTIVE N/A N/A AUX2 IN is programmed for SHUTDOWN and 24 V has
been applied to AUX 2IN terminal.
DMP CAL RUNNING N/A N/A
If DCV Auto enable has been programmed, when the
W7220 is completing a calibration on the dampers, this
alarm will display. Wait until the calibration is completed
and the alarm will go away. Must have OA, MA and RA
sensors for DCV calibration; set up in the Advanced
setup menu.
DA SENS ALM N/A N/A
Discharge air temperature is out of the range set in the
ADVANCED SETUP Menu. Check the temperature of
the discharge air.
SYS ALARM N/A N/A
When AUX1-0 is set to SYS and there is any alarm
(e.g., failed sensors, etc.), the AUX1-0 terminal has 24
Vac out.
ACT UNDER V N/A N/A Voltage received by actuator is above expected range.
ACT OVER V N/A N/A Voltage received by actuator is below expected range.
ACT STALLED N/A N/A Actuator stopped before achieving commanded
position.
CLO — Compressor Lockout
ERV — Energy Recovery Ventilator
LCD — Liquid Crystal Display
MA — Mixed Air
MAT — Mixed Air Temperature
N/A — Not Applicable
OA — Outdoor Air
OAT — Outdoor Air Temperature
OCC — Occupied
RA — Return Air
RAT — Return Air Temperature
RTU — Rooftop Unit
SYS — System

19
CHECKOUT TESTS
Use the Checkout menu (see Table 6) to test the damper operation
and any configured outputs. Only items that are configured are
shown in the Checkout menu.
NOTE: See User Interface 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.
3. RUN? appears.
4. Press the button to start the test.
5. The unit pauses and then displays IN PROGRESS.
6. When the test is complete, DONE appears.
7. When all desired parameters have been tested, press the
(Menu Up) button to end the test.
Checkout test can be performed at any time during the operation
of the system as a test that the system is operable.
SETUP AND CONFIGURATION
W7220 Economizer Module Wiring
Use Fig. 33 and Tables 7 and 8 to locate the wiring terminals for
the economizer module.
NOTE: The four terminal blocks are removable. You can slide out
each terminal block, wire it, and then slide it back into place.
Fig. 33 — W7220 Economizer Module Terminal Connection Labels
CAUTION
Failure to follow this caution may result in damage to
equipment. Be sure to allow enough time for compressor
startup and shutdown between checkout tests so that you do
not short-cycle the compressors.
NA
AUX2-
OCC
E-GND
EXH1
AUX1-O
Y2-
Y1-
Y2-O
Y1-O
C
R
50048848-002
Rev. A
NA
A2
OCC
EX
A1
Y2I
Y2O
Y1I
Y1O
C
R
MAT
MAT
OAT
OAT
S-BUS
S-BUS
IAQ 2-10
IAQCOM
IAQ 24V
ACT 2-10
ACT COM
ACT 24V
MA
MA
OA
OA
SB
SB
SB
SB
SB
SB
V
C
R
V
C
R
NA
50040839-001
Rev. G
HJW10
www.energy.ca.gov
Certified FDD Product
California Title 24, Part 6

20
Table 7 — Economizer Module - Left Hand Terminal
Blocks
Table 8 — Economizer Module - Right Hand Terminal
Blocks
Timeout and Screen Saver
When no buttons have been pressed for 10 minutes, the LCD
displays a screen saver, which cycles through the Status items.
Each status item displays in turn and cycles to the next item after
5 seconds.
HH79AH001 Dry Bulb Sensor
Economizers are shipped standard with an HH79AH001 outside
air dry bulb sensor (see Fig. 34). System default setting (high
temp limit) is 63°F, and has a range of 48°F to 80°F. The sensor is
factory installed on the economizer.
NOTE: A second HH79AH001 sensor is provided for mixed
air temperature.
Fig. 34 — HH79AH001 Dry Bulb and Mixed Air Sensor
NOTE: California high temperature setting requirements by
region are shown below in Table 9.
Table 9 — California Title 24 Regional High Limit Dry
Bulb Temperature Settings
* Only the high limit control devices listed are allowed to be used and at the
setpoints listed. Others such as Dew Point, Fixed Enthalpy, Electronic Enthalpy,
and Differential Enthalpy Controls, may not be used in any climate zone for
compliance with Section 140.4(e)1 unless approval for use is provided by the
Energy Commission Executive Director.
† At altitudes substantially different than sea level, the Fixed Enthalpy limit value
shall be set to the enthalpy value at 75°F and 50% relative humidity. As an
example, at approximately 6,000 foot elevation, the fixed enthalpy limit is approxi-
mately 30.7 Btu/lb.
Enthalpy Settings (Enthalpy Optional)
If installing the optional HH57AC081 enthalpy sensor. The
HH79AH001 dry bulb outside air sensor must first be removed.
Wire enthalpy to S-BUS connections on W7220 controller
through (2) gray wires.
When the OA temperature, enthalpy and dew point are below the
respective setpoints, the outdoor air can be used for economizing.
Figure 35 shows the new single enthalpy boundaries in the
W7220. There are 5 boundaries (setpoints ES1 through ES5),
which are defined by dry bulb temperature, enthalpy and dew
point.
See Table 10 for ENTH CURVE setpoint values.
To use enthalpy the W7220 must have a HH57AC081 enthalpy
control sensor for OA. The W7220 calculates the enthalpy and
dewpoint using the OA temperature and humidity input from the
OA sensor. When the OA temperature, OA humidity and OA dew
point are all below the selected boundary, the economizer sets the
economizing mode to YES, economizing is available.
When all of the OA conditions are above the selected boundary,
the conditions are not good to economize and the mode is set to
NO. If using OA enthalpy sensor option, remove and discard the
dry bulb sensor shipped with the economizer. System default
setting is ES3 enthalpy curve. See Table 9 for California Title 24
high limit dry bulb temperature settings.
Figure 35 shows the 5 current boundaries. There is also a high
limit boundary for differential enthalpy. The high limit boundary
is ES1 when there are no stages of mechanical cooling energized
and HL (high limit) when a compressor stage is energized.
Table 10 provided the values for each boundary limit.
LABEL TYPE DESCRIPTION
Top Left Terminal Block
MAT
MAT
20k NTC
and COM
Mixed Air Temperature Sensor (Polarity
Insensitive Connection)
OAT
OAT
20k NTC
and COM
Outdoor Air Temperature Sensor (Polarity
Insensitive Connection)
S-BUS
S-BUS
S-BUS
(Sylk Bus)
Enthalpy Control Sensor
(Polarity Insensitive Connection)
Bottom Left Terminal Block
IAQ 2-10 2-10 vdc Air Quality Sensor Input (e.g. CO2 sensor)
IAQ COM COM Air Quality Sensor Common
IAQ 24V 24 vac Air Quality Sensor 24 vac Source
ACT 2-10 2-10 vdc Damper Actuator Output (2-10 vdc)
ACT COM COM Damper Actuator Output Common
ACT 24v 24 vac Damper Actuator 24 vac Source
LABEL TYPE DESCRIPTION
Top Right Terminal Blocks
AUX2 I 24 vac IN The first terminal is not used.
OCC 24 vac IN
Shut Down (SD) or HEAT (W)
Conventional only
and
Heat Pump Changeover (O-B) in Heat
Pump mode.
E-GND E-GND Occupied/Unoccupied Input
EXH1 24 vac OUT Exhaust Fan 1 Output
AUX1 O 24 vac OUT
Programmable:
Exhaust fan 2 output
or
ERV
or
System alarm output
Bottom Right Terminal Blocks
Y2-I 24 vac IN Y2 in - Cooling Stage 2 Input from space
thermostat
Y2-O 24 vac OUT Y2 out - Cooling Stage 2 Output to stage
2 mechanical cooling
Y1-I 24 vac IN Y1 in - Cooling Stage 2 Input from space
thermostat
Y1-O 24 vac OUT Y1 out - Cooling Stage 2 Output to stage
2 mechanical cooling
C COM 24 vac Common
R 24 vac 24 vac Power (hot)
DEVICE TYPE* CLIMATE
ZONES
REQUIRED HIGH LIMIT
(ECONOMIZER OFF
WHEN):
DESCRIPTION
FIXED DRY BULB
1, 3, 5, 11-16 OAT exceeds 75°F
2, 4, 10 OAT exceeds 73°F
6, 8, 9 OAT exceeds 71°F
7 OAT exceeds 69°F
DIFFERENTIAL DRY
BULB
1, 3, 5, 11-16 OAT exceeds RA Temp.
2, 4, 10 OAT exceeds -2°F
6, 8, 9 OAT exceeds -4°F
7 OAT exceeds -4°F
FIXED ENTHALPY†
+ FIXED DRY BULB ALL OAT exceeds 28 Btu/lb of dry air or OAT exceeds 75°F
Honeywell
HH79AH001