International Comfort Products DNECOMZR052A00, DNECOMZR053A00 Installation Manual
Installation Instructions
DNECOMZR052A00 and DNECOMZR053A00
Vertical and Horizontal Economizer IV Accessory
Medium Rooftop Units − 15 to 25 Tons
TABLE OF CONTENTS
PACKAGE USAGE 1..............................
SAFETY CONSIDERATIONS 1.....................
PACKAGE CONTENTS 1..........................
GENERAL 2.....................................
ACCESSORIES LIST 2............................
VERTICAL INSTALLATION 2......................
HORIZONTAL INSTALLATION 6...................
CONFIGURATION 8..............................
OPERATION 12..................................
TROUBLESHOOTING 13..........................
IMPORTANT: Read these instructions completely
before attempting to install the accessory Economizer
IV.
PACKAGE USAGE
UNIT SIZE PART NUMBER
15, 17.5, 20 Ton DNECOMZR052A00
25 Ton DNECOMZR053A00
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire,
electrical shock, or other conditions which may cause
death, personal injury, or property damage. Consult a
qualified installer, service agency, or your distributor
or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the
individual instructions packaged with the kits or
accessories when installing.
Follow all safety codes. Wear safety glasses,
protective clothing, and work gloves. Have a fire
extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult
local building codes, the current editions of the
National Fuel Gas Code (NFGC) NFPA 54/ANSI
Z223.1, and the National Electrical Code (NEC)
NFPA 70.
In Canada refer to the current editions of the National
Standards of Canada CAN/CSA-B149.1 and .2
Natural Gas and Propane Installation Codes, and
Canadian Electrical Code CSA C22.1.
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, and CAUTION. 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
Specifications subject to change without notice.
to highlight suggestions which will result in enhanced
installation, reliability, or operation.
!
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in
personal injury or death.
Before performing service and maintenance
operations on unit, turn off main power switch to
unit. If gas unit, shut off gas supply before
shutting off main power.
TAG DISCONNECT SWITCH WITH A
SUITABLE LOCK AND WARNING LABEL.
UNIT QTY CONTENTS
1 Damper Assembly
1 Upper End Economizer Panel
Bottom Panel w/Relief Damper (for
1
vertical only)
1 Bottom Panel #2 (for horizontal only)
Side Replacement Panel (for
1
horizontal only)
4 Hood Angles
DNECOMZR052A00
DNECOMZR053A00
2 Hood Side Plates
1 Hood Top
2 Side Filter Supports
2 Side Drip Angles
2 Top Hood Diverters
1 Supply Air Temperature Sensor (SAT)
60 Screws
1 Seal Strip
1 Damper Assembly
1 Upper End Economizer Panel
Bottom Panel w/Relief Damper (for
1
vertical only)
1 Bottom Panel #2 (for horizontal only)
1 Hood Angles
4 Hood Side Panels
2 Hood Top
1 Outdoor Air Screens
4 Side Filter Supports
2 Side Drip Angles
2 Top Hood Diverters
1 Supply Air Temperature Sensor (SAT)
60 Screws
1 Seal Strip
513 06 2401 01 March 2010
Table 1 Economizer IV Sensor Usage
Economizer IV WITH OUTDOOR AIR
APPLICATION
Outdoor Air Dry Bulb None. The outdoor air dry bulb sensor is factory installed.
Single Enthalpy AXB078ENT
Differential Enthalpy AXB078ENT and DNENTDIF004A00*
CO2 for DCV Control using a Duct−Mounted CO2 Sensor DNCBDIOX005A00
* DNENTDIF004A00 and DNTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be needed for
installation.
a. For units with two position damper installed,
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in
personal injury and/or death.
Disconnect power supply and install lockout tag
before attempting to install the accessory.
remove the outside air hood. Unplug the
damper actuator and remove assembly from
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 Figure 1)
Save the screws for use later when replacing the
panel. The panels can be discarded.
DRY BULB SENSOR
Accessories Required
GENERAL
!
The Economizer IV 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 ventilation is
supported.
The Economizer IV system utilizes gear-drive
technology with a direct-mount spring return actuator
that will close upon loss of power. The Economizer IV
system comes standard with an outdoor air temperature
sensor, supply air temperature sensor, and low
temperature compressor lockout switch. indoor enthalpy
and outdoor enthalpy sensors are available for field
installation. Field-installed CO
Barometric relief dampers provide natural building
pressurization control. Barometric relief dampers are
built into the design and are standard. An optional power
exhaust system is available for applications requiring
even greater exhaust capabilities. The power exhaust
set point is adjustable at the Economizer IV controller.
See Package Contents and Package Usage tables for
more information. See Table 1 for sensor usage.
sensors are available.
2
ACCESSORIES LIST
The Economizer IV has several field-installed
accessories available to optimize performance. Refer to
Table 2 for authorized parts.
Table 2
Power Exhaust 208−230 v 3 Ph DNPWREXH068A00
Power Exhaust 460 v 3 Ph DNPWREXH069A00
Power Exhaust 575 v 3 Ph DNPWREXH070A00
Outdoor Air Enthalpy Sensor AXB078ENT
Indoor Air Enthalpy Sensor DNENTDIF004A00
Return Air CO2 Sensor (4 to 20 mA) DNCBDIOX005A00
Economizer IV Field−Installed Accessories
DESCRIPTION PART NUMBER
VERTICAL INSTALLATION
These economizers are designed to work in both a
vertical and horizontal applications. These instructions
are for a vertical installation.
1. Turn off unit power supply and install lockout tag.
2. Prepare the unit for economizer installation:
2
Specifications subject to change without notice.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in
personal injury and damage to 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.
Figure 1 Upper and Bottom Panel on End of Unit
Upper End Panel
Shipped on Base Unit
Bottom Panel
Shipped on Base Unit
4. Remove the unit's left side corner post and left
side panel from the unit to allow for easy econom
izer installation. (See Figure 2)
5. Install economizer, as shown in Figure 2, into the
return air section of the unit. Be careful not to
pinch the wires during installation. Bottom of eco
nomizer will rest on the base of the unit. (See
Figure 5)
6. Reinstall the left side corner post on to the unit.
Note the corner post will sit behind the economizer
flange. (See Figure 3) Screw through the corner
post and through the economizer. (See Figure 3
and Figure 4)
7. Insert provided screw through the bottom left rear
of the economizer and into the unit base. (See
Figure 5) Reinstall the unit's left side panel.
8. Before the economizer is secured in place on the
right hand side, remove and save the 12-pin jump
er plug from the unit wiring harness. (See
Figure 6) Insert the economizer plug into the unit
wiring harness plug.
NOTE: The 12-pin jumper plug should be saved for
future use in the event that the Economizer IV is
removed from the unit. The jumper plug is not needed as
long as the Economizer IV is installed.
CAUTION
Indoor-fan Panel
C09327
513 06 2401 01
Figure 2 Unit Left Side Panel and Corner Post
Unit's Left
Left
Corner
Post
Economizer IV
Side Panel
C09328
Figure 3 Top View
9. Remove the indoor-fan motor access panel. (See
Figure 1)
10. Install the supply air temperature sensor (SAT).
The sensor looks like and eyelet terminal with 2
attached wires, and is shipped in the economizer
hardware bag. The sensor is located on the
“crimped” end and is sealed for moisture. Mount
the SAT to the indoor blower housing. (See
Figure 7) Use the provided screw to secure in
place. Attach the PINK and VIOLET wires in the
unit to the sensor.
11. Replace the indoor-fan motor access panel.
12. Install the bottom panel with the relief damper at
tached on the unit. (See Figure 8) Screw panel in
place.
NOTE: Remove the bottom screw holding the relief
blade closed.
13. 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
Figure 8)
Figure 6 Unit Wiring Harness
Figure 4 Front Left View
Economizer Outside
Air Damper
Insert
Screw
Left Front
Corner Post
Insert
Screw
Figure 5 Side View
C09329
C09330
C09332
513 06 2401 01
C09331
Specifications subject to change without notice.
3
Figure 7 Blower Housing
V
C09333
Figure 8 End View of Unit
Insert (2) screws thru panel
and into economizer
Provided
Upper Panel
Economizer
Outside Air
Damper
Provided Bottom
Panel with
Relief
Relief Damper
Remove
shipping
screw
C09334
Figure 9 Economizer IV Component Locations
Outside Air
Damper
Economizer
Actuator
Low Temp.
Lockout
Economizer I
Controller
Wiring
Harness
g. Install the side filter supports using the screws
provided.
h. Install the side drip edge angles using the
screws provided.
i. Run a continuous length of seal strip across
the hood covering the engagement hole in the
lower hood.
j. Install top diverter using screws provided.
15. Install the hood assembly on to the unit. (See
Figure 11 and Figure 12)
16. Through the outdoor air hood, review and adjust
the Economizer IV controller settings. See “Opera
tion” section of this manual for details.
a. The standard Economizer IV controller has a
factory setting of 63 F for the outdoor air tem
perature changeover and 55F (fixed) for the
supply air temperature sensor. The outdoor air
temperature changeover setting is adjusted on
the sensor by setting the dip switches on the
sensor. See Fig 19. The ABCD potentiometer
on the controller should be set to the “D” posi
tion.
b. The low temperature compressor lockout
switch is fixed at 42F.
c. The minimum position for the outdoor air
damper can be configured for specific job re
quirements at the controller. When not using
with a CO2 sensor, the DCV Max potentiomet
er on the controller must be fully closed (CCW)
for the Minimum Position potentiometer to func
tion correctly.
d. Settings for the optional outdoor enthalpy
sensor, indoor enthalpy sensor, power exhaust,
and CO
troller.
sensor can be configured at the con
2
17. Install the hood screens and other approved
Economizer IV accessories.
Outside Air
Temp (OAT)
sensor
Return Air Damper
C09335
14. Assemble the outside air hood per Figure 10 and
Figure 11.
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.
c. Secure the hood side plates to the panel using
screws provided.
d. On 44 inch chassis, remove screws across top
cover. Attach hood top to hood side plates (on
44 inch chassis, flange will slide behind flange
of top cover).
e. On 44 inch chassis, reinstall the screws previ
ously removed. On the 52 inch chassis, secure
top flange using screws provided in kit.
f. Install the front outdoor air screens by sliding
them into the channel formed by the four
angles installed previously. Make sure the
screens extend across the entire length of the
hood.
NOTE: Screens may be left out at this time to allow for
Economizer IV adjustments.
4
Specifications subject to change without notice.
513 06 2401 01
Figure 10 Hood Assembly
A
pply Seal Strips
to the back of
these flanges
2
Seal Strips
Figure 11 Hood Assembly
5
Apply Seal Strip
to the front of
this flange
6
Apply Seal Strips
to the back of
these surfaces
7
4
Item # Description Qty
1 Angles 4
2 Side Plates 2
3 Hood 1
4 Outdoor Air Screens 4
5 Side Filter Supports 2
6 Side Drip Angles 2
7 Top Diverters 2
4
1
3
7
4
Apply Seal Strip
to the back of
this flange
Apply Seal Strip
to the front of
this flange
4
2
5
6
C09079
C09090
Figure 12 Hood Assembly Installed on Unit
Outdoor Air Hood
Relief Damper
C09338
513 06 2401 01
Specifications subject to change without notice.
5
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