Carrier CRECOMZR074A01 Installation Instructions Manual
  1. Manuals
  2. Brands
  3. Carrier Manuals
  4. Air Conditioner
  5. CRECOMZR074A01
  6. Installation instructions manual

Carrier CRECOMZR074A01 Installation Instructions Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Part No: CRECOMZR074A01 and CRECOMZR075A01
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Vertical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . 6
Barometric Hood Assembly . . . . . . . . . . . . . . . . . . . . 7
Vertical and Horizontal Applications . . . . . . . . . . . . . 8
EconoMi$er X System . . . . . . . . . . . . . . . . . . . . . . . . 13
SETUP AND CONFIGURATION . . . . . . . . . . . . . . . . 19
W7220 Economizer Module Wiring . . . . . . . . . . . . . 19
Timeout and Screen Saver . . . . . . . . . . . . . . . . . . . . 20
HH79AH001 Dry Bulb Sensor . . . . . . . . . . . . . . . . . . 20
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Heating with EconoMi$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
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
Ultra Low Leak EconoMi$er
Installation Instructions
Page
Printed in U.S.A.
Form IIK-CRECOMZR74-04
Medium Rooftop Units
•
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.
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.

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.
Pg 1
12.5 to 27.5 Tons
X Accessory
®
9-21 Replaces: IIK-CRECOMZR74-03

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the CRECOMZR074A01 and is the answer not in the manual?

Questions and answers

Related Manuals for Carrier CRECOMZR074A01

Summary of Contents for Carrier CRECOMZR074A01

  • Page 1: Table Of Contents

    Medium Rooftop Units 12.5 to 27.5 Tons Ultra Low Leak EconoMi$er X Accessory ® Installation Instructions Part No: CRECOMZR074A01 and CRECOMZR075A01 • Wear safety glasses and work gloves CONTENTS • Use care in handling and installing this accessory Page It is important to recognize safety information. This is the safety- SAFETY CONSIDERATIONS .

  • Page 2: Compliance

    Bottom Panel #2 with Return Duct Relief air, outside air, and return air (volume) dampers are AMCA Opening rated. (for horizontal only) Side Replacement Panel Table 1 — Carrier Usage Chart (for horizontal only) Filter Supports ECONOMI$ER X PART ®...

  • Page 3: Installation

    Table 5 — EconoMi$er X Sensor Usage ® Indoor Fan Panel ECONOMI$ER X WITH OUTDOOR AIR DRY ® BULB SENSOR APPLICATION Upper End Panel Accessories Required Shipped On Outdoor Air Dry The HH79AH001 outdoor air dry bulb sensor is Base Unit Bulb factory installed on the economizer.
  • Page 4 Install the bottom panel with the relief damper attached on the unit. (See Fig. 8.) Screw the panel in place. Units Left NOTE: Remove the bottom screw holding the relief blade Side Panel closed. NOTE: Access to the economizer actuator is through the HVAC unit’s left side panel.
  • Page 5 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.

  • Page 6: Horizontal Installation

    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. Unit’s Left Side Panel With Duct Opening Fig. 13 — Hood Assembly — Completed Outdoor Air Hood Left Front...

  • Page 7: Barometric Hood Assembly

    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.

  • Page 8: Barometric Hood (Horizontal Configuration)

    Fig. 22 — Installed Barometric Hood Side View and Isometric View Fig. 24 — Installing CRBARHOD001A00 Over Relief BAROMETRIC HOOD (HORIZONTAL CONFIGURATION) Damper For horizontal return and field installed economizer, install the economizer as follows: Install the field provided horizontal ductwork onto the unit. Duct height must be at least 19-1/2 in.

  • Page 9: Wiring Instructions For 1 And 2 Speed Units

    and can be removed from the W7220 and discarded. Follow all Inside control box – connect 4-pin plug from the W7220 local and other applicable codes. controller to the 4-pin 50HEHMRAE--A10 harness provided with economizer accessory. Wiring Instructions for 1 and 2 Speed Units Inside the control box –...
  • Page 10 Fig. 28 — Typical EconoMi$er X Wiring Diagram for 1 and 2 Speed Units...
  • Page 11 NOTES: 1. Wires shown in bold are part of 48LCHSRADH--A00 harness which is provided with 48/50LC 14-26 size with 3 speed units. 2. Harness 50HEHMRAEH-A00 which is provided with economizer accessory is not used on 3 speed units. Fig. 29 — Typical EconoMi$er X Wiring Diagram for 3 Speed Units (See 3 Speed Unit Instructions for Complete Diagram)
  • Page 12 CONNECT TO UNIT TERMINAL BOARD CONNECT TO UNIT TERMINAL BOARD FIELD ATTACH TO W7220 CONTROLLER Fig. 30 — 48LCHSRADH-A00 Harness for 3 Speed Units (48/50LC 14-26) (Provided with 3 Speed Units, Field Attached to W7220 Controller)

  • Page 13: Economi$Er X System

    USING KEYPAD WITH SETTINGS EconoMi$er X System PARAMETERS The field-installed accessory consists of the following: To use the keypad when working with Setpoints, System and • Low leak economizer assembly Advanced Settings, Checkout Tests and Alarms: • HH79AH001 OA Dry Bulb Sensor Navigate to the desired menu.
  • Page 14 The W7220 controller provides the following: IMPORTANT: The default setting on the W7220 controller is • 2-line LCD interface screen for setup, configuration and for a “Fan Type” with 2 speed, which is correct for 2 or 3 speed troubleshooting units (48/50LC 14-26).
  • Page 15 Table 6 — Menu Structure PARAMETER PARAMETER RANGE AND MENU PARAMETER DEFAULT NOTES INCREMENT VALUE YES = economizing available; the system can use ECONO AVAIL YES/NO outside air for free cooling when required ECONOMIZING YES/NO YES = outside air being used for 1 stage cooling YES = OCC signal received from space thermostat or unitary controller OCCUPIED...
  • Page 16 Table 6 — Menu Structure (cont) PARAMETER PARAMETER RANGE AND MENU PARAMETER DEFAULT NOTES INCREMENT VALUE Setpoint determines where the economizer will modulate the MAT SET 53°F 38°F to 65°F; increment by 1 OA damper to maintain the mixed air temperature. Setpoint determines outdoor temperature when the -45°F to 80°F;...
  • Page 17 Table 6 — Menu Structure (cont) PARAMETER PARAMETER RANGE AND MENU PARAMETER DEFAULT NOTES INCREMENT VALUE Temperature to achieve Freeze Protection (close 35°F to 55°F; MA LO SET 45°F damper and alarm if temperature falls below setup Incremented by 10 value).
  • Page 18 Table 6 — Menu Structure (cont) PARAMETER PARAMETER RANGE AND MENU PARAMETER DEFAULT NOTES INCREMENT VALUE 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”...

  • Page 19: Checkout Tests

    CHECKOUT TESTS Checkout test can be performed at any time during the operation of the system as a test that the system is operable. Use the Checkout menu (see Table 6) to test the damper operation and any configured outputs. Only items that are configured are CAUTION shown in the Checkout menu.

  • Page 20: Timeout And Screen Saver

    Table 7 — Economizer Module - Left Hand Terminal Blocks LABEL TYPE DESCRIPTION Top Left Terminal Block 20k NTC Mixed Air Temperature Sensor (Polarity and COM Insensitive Connection) H H 7 9 A H 0 0 1 20k NTC Outdoor Air Temperature Sensor (Polarity and COM Insensitive Connection) S-BUS...

  • Page 21: Enthalpy Control Sensor Configuration

    ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 35 — Single Enthalpy Curve Boundaries Table 10 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...

  • Page 22: Operation

    Should 100% outside air not be capable of satisfying the space OPERATION temperature, space temperature will rise until Y2 is closed. The Cooling, Unit with EconoMi$er X System economizer control will call for compressor operation. Dampers will modulate to maintain SAT at set point concurrent with For Occupied mode operation of EconoMi$er X system, there Compressor 1 operation.

  • Page 23: Demand Controlled Ventilation (Dcv)

    Demand Controlled Ventilation (DCV) Alarms If a field-installed CO sensor is connected to the EconoMi$er X The economizer module provides alarm messages that display on control, a Demand Controlled Ventilation strategy will operate the 2-line LCD. automatically. As the CO level in the space increases above the NOTE: Upon power up, the module waits several seconds before setpoint (on the EconoMi$er X controller), the minimum position...
  • Page 24 © 2021 Carrier 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 24 9-21 Replaces: IIK-CRECOMZR74-03...

This manual is also suitable for:

Crecomzr075a01

Table of Contents

Save PDF