Carrier COBRA 48/50HJ004-014- User Manual

Carrier COBRA 48/50HJ004-014

Carrier COBRA 48/50HJ004-014– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.

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Table of Contents:

  • Page 2 – COBRA Curb Application —; Fig. 1 — COBRA Energy Recovery Unit
  • Page 3 – UNIT
  • Page 7 – Fig. 7 — Typical Energy$RecyclerTM Installation
  • Page 8 – AA; Fig. 8A — COBRATM Iso-Exhaust Return Air Hood Dimensions —; COBRA SCOOP OPENING; LEGEND
  • Page 9 – Fig. 8B — COBRATM Iso-Exhaust Return Air Hood Dimensions —
  • Page 10 – Field-Installed 62AQ Application —; Ductwork attaches to the roof curb do not attach ductwork; Table 1 — Field-Installed 62AQ Required Equipment Support; MOUNTING KIT; Fig. 9 — Rooftop Unit and Field-Installed 62AQ Unit
  • Page 11 – SYSTEM OPERATION; In cooling mode the E$R upper coil acts as the evaporator.; Fig. 11 — Typical Unit Airflow Diagram; db; RH; wb
  • Page 12 – ROOFTOP UNIT
  • Page 13 – Fig. 15 — Typical Occupied Cooling Operation
  • Page 14 – Fig. 16 — Typical Occupied Cooling Operation
  • Page 15 – Changeover Thermostats —; Changeover thermostats; Fig. 18 — Changeover Thermostat
  • Page 16 – Fans —; Fig. 19 — Outdoor-Air Thermostat Heating Label
  • Page 17 – COBRATM and 62AQ Unit Options; The incorporation of the Humidi-MiZer adaptive dehumid-; Fig. 20 — Humidi-MiZer Dehumidification Option Schematic
  • Page 19 – Table 5 — Factory Supported Rooftop Unit with; Table 4 — Typical COBRATM Unit Outdoor Air Usage; SECTION; Optional 25% OA Damper
  • Page 20 – SIG COM; OC; Sensor Wiring with Electro-Mechanical Controls; Sensor Wiring with PremierLinkTM Direct Digital Control (DDC)
  • Page 22 – CONTROL BOX; LIGHT COMMERCIAL THERMIDISTAT
  • Page 24 – Cool
  • Page 25 – LIGHT COMMERICAL THERMIDISTAT
  • Page 28 – Gas Supply —; The gas supply for 48HJ gas heat units; Fig. 30 — Field Wiring Connections
  • Page 29 – and moving to the 200-volt; Field Control Wiring —; Fig. 35 — Typical Field Wiring Power Connections; NFD —
  • Page 30 – Fig. 36 — Factory Wire Routing for COBRATM Energy Recovery Unit; POWER WIRING OPTIONS FOR FIELD INSTALLED 62AQ ENERGY RECYCLER; Fig. 38 — Method B: Field-Installed 62AQ With Separate Power Wiring
  • Page 33 – PC; OR; Fig. 42 — CCN Bus Wiring
  • Page 34 – Fig. 43 — Condensate Drain Location
  • Page 35 – Table 6 — Peak Dry Bulb Temperature Summary
  • Page 36 – Design Example 2 —; Table 10 — Dry Bulb with COBRA Unit
  • Page 37 – The selection procedure with Packaged Rooftop Builder; Fig. 45 — Electronic Selection Program — COBRA Design Criteria
  • Page 38 – Fig. 46 — Electronic Selection Program — Performance Summary
Loading the manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 514-80013

Printed in U.S.A.

Form 48/50HJ,62AQ-2XA

Pg 1

12-05

Replaces: 48/50HJ,62AQ-1XA

Book 1

1

Tab

1a 1b

Application Data

CONTENTS

Page

GENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Features/Benefits

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

COBRA Curb Application

. . . . . . . . . . . . . . . . . . . . . . . . 2

COBRA Iso-Exhaust Split Return Duct

Application

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Field-Installed 62AQ Application

. . . . . . . . . . . . . . . . 10

SYSTEM OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . 11-20

Cooling Mode

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Heating Mode

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Defrost

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Changeover Thermostats

. . . . . . . . . . . . . . . . . . . . . . . 15

Fans

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

COBRA and 62AQ Unit Options

. . . . . . . . . . . . . . . . . 17

CONTROLS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-28

Thermidistat™ Device

. . . . . . . . . . . . . . . . . . . . . . . . . . . 21

PremierLink™ Controller

. . . . . . . . . . . . . . . . . . . . . . . . 21

Gas Supply

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

WIRING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-33

Field Power Supply

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Factory-Supplied Non-Fused Disconnect

. . . . . . . 29

Field Control Wiring

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

CONDENSATE PIPING

. . . . . . . . . . . . . . . . . . . . . . . . . . 34

DAMPERS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Supply-Air Dampers

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Barometric Relief Damper

. . . . . . . . . . . . . . . . . . . . . . . 34

Multiple Stage Cooling Control

. . . . . . . . . . . . . . . . . . 34

DESIGN EXAMPLES

. . . . . . . . . . . . . . . . . . . . . . . . . . .35,36

Design Example 1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Design Example 2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

SELECTION PROCEDURE WITH

PACKAGED ROOFTOP BUILDER

. . . . . . . . . . . .37,38

GENERAL

Carrier’s COBRA™ energy recovery units and field-

installed 62AQ Energy$Recycler™ units use Carrier’s patented
heat pump technology to reclaim energy from building exhaust
air. This energy is then used to pre-condition ventilation air for
the rooftop unit during winter and summer operation. These
units are designed to satisfy higher ventilation requirements and
other building codes while minimizing energy costs.

The 62AQ Energy$Recycler unit can be field-installed or

factory-installed. When it is factory-installed on a 48HJ or
50HJ rooftop unit, the combined total package is designated as
a COBRA unit. Factory installation of the 62AQ unit provides
the benefit of reduced field-installation time, single point
power connections, and the assurance of a factory test for the
complete COBRA unit. The COBRA unit requires less mainte-
nance than other energy recovery systems and can be serviced
by a qualified refrigerant technician. See Fig. 1.

NOTE: The COBRA unit nameplate is located on the opposite
end of the rooftop section, on the upper right-hand part of the
panel due to the location of the 62AQ Energy$Recycler
section.

For field-installed 62AQ applications, the 62AQ unit must

be connected to the base unit in the field. The 62AQ unit
attaches directly to the return air opening of the rooftop unit
using hardware provided in an accessory mounting kit and
support rail. Power and control wiring for the 62AQ unit are
also field provided. The rooftop unit must be curb mounted in
the vertical supply and return configuration only. Connection to
competitive units requires field-supplied mounting arrange-
ments and ductwork.

Additional literature available for 62AQ Energy$Recycler

units or the combined COBRA units include:
• The 62AQ Energy$Recycler Product Data: applies to

COBRA and field-installed 62AQ units.

• The COBRA Energy Recovery Unit Installation, Start-

Up and Service Supplement: applies to COBRA units
only.

• The 62AQ Energy$Recycler Installation, Start-Up and

Service Instructions applies to field-installed 62AQ
units.

Features/Benefits —

Carrier’s

COBRA

and

field-

installed 62AQ units provide all-in-one unitary offerings with
energy recovery capability and total latent load control.
DOWNSIZE ROOFTOP UNIT — By pre-conditioning the
outdoor air, the evaporator mixed entering air conditions can be
reduced, which may allow for use of a smaller tonnage rooftop
unit. Units have up to 100% outdoor air (OA) capability for
compliance with industry ventilation standards.
COST EFFICIENT OPERATION — Utilizing energy from
exhaust air allows for improved indoor air quality (IAQ) and
enhanced rooftop unit efficiency at both peak and part load
conditions.
ADDITIONAL STAGES — System flexibility allows for the
energy recovery device to operate as an additional stage of
heating or cooling.
EASE OF INSTALLATION — Available

as

a

factory-

installed option on the Weathermaster® 48/50HJ 3 to 12

1

/

2

ton

rooftop product line, COBRA energy recovery units provide
expanded capability to the rooftop unit’s performance. The
factory-installed COBRA energy recovery unit is applicable
for vertical-supply, vertical-return configuration units only.
UNIT MOUNTING — The 62AQ Energy$Recycler unit is
designed to mount directly to vertically ducted rooftop units
using an accessory mounting kit and support rail. No additional
roof curb is required.

COBRA™ Energy Recovery Units

48/50HJ004-014 with 62AQ060-300

Single-Package Rooftop Units

and Field-Installed 62AQ060-300

ENERGY$RECYCLER™ Units

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Summary

Page 2 - COBRA Curb Application —; Fig. 1 — COBRA Energy Recovery Unit

2 FACTORY INSTALLATION BENEFITS — When a 62AQEnergy$Recycler™ unit is factory-installed on a rooftop unit, itis designated as COBRA™ unit. See Fig. 1 for COBRAconfiguration. Benefits of factory installation of the energyrecovery section include:• reduced field-installation time• single point power c...

Page 3 - UNIT

3 FULL PERIMETER ROOF CURB Deck pans 67 3/8" 37 3/16" 14" 92 1/2" 37 3/16" 14" Deck pans must be watertight R1 Supply SIDE VIEW END VIEW 2" 2" Return support.Only used on someapplications. DUCT OPENING SIZES Supply = 13 7/8" x 20 1/4"R1 = 13 5/8" x 17 3/4&...

Page 7 - Fig. 7 — Typical Energy$RecyclerTM Installation

7 EXHAUST AIR CONDENSER-FANDISCHARGE AIR FRESH AIR INLET MOUNTINGKIT FILTERACCESS OUTDOOR-AIRINLET RETURN AIRBAFFLE ROOF CURB RETURN AIR SUPPLY AIR OUTDOOR AIRFLOW INDOOR AIRFLOW Fig. 7 — Typical Energy$Recycler™ Installation (Field-Installed 62AQ with Standard Unit Roof Curb Shown)

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