Carrier 42DH, Manual

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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420022-01 Printed in U.S.A. Form 42DHV-2SI Pg 1 1-22 Replaces: 42DHV-1SI
Installation, Start-Up, and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
AHRI Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
C-ETL-US Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . 3
Prepare Job Site for Unit Installation . . . . . . . . . . . . 3
Identify and Prepare Units . . . . . . . . . . . . . . . . . . . . . 3
Protect Units from Damage . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 — Place Unit In Position . . . . . . . . . . . . . . . . . 3
Step 2 — Install Mixing Box . . . . . . . . . . . . . . . . . . . . 7
Step 3 — Connect Cooling/Heating Piping . . . . . . . 10
Step 4 — Make Electrical Connections . . . . . . . . . . 19
Step 5 — Connect Ductwork . . . . . . . . . . . . . . . . . . 19
Step 6 — Make Final Preparations . . . . . . . . . . . . . 20
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Cooling/Heating System . . . . . . . . . . . . . . . . . . . . . . 20
Direct Expansion (DX) Systems . . . . . . . . . . . . . . . . 21
Air Balance System . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Motor/Blower Assembly . . . . . . . . . . . . . . . . . . . . . . 21
Electronically Commutated Motor (ECM) . . . . . . . . 21
Control Board Adjustment . . . . . . . . . . . . . . . . . . . . 21
Water Balancing System . . . . . . . . . . . . . . . . . . . . . 22
Water Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electric Resistance Heater Assembly . . . . . . . . . . . 23
Cabinet/Control Box Maintenance Light . . . . . . . . . 24
Electrical Wiring and Controls . . . . . . . . . . . . . . . . . 24
Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Filters — Throwaway . . . . . . . . . . . . . . . . . . . . . . . . 24
Filters — Replacement and Installation . . . . . . . . . 24
APPENDIX A — TYPICAL WIRING DIAGRAM
EXAMPLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock or
other conditions which may cause 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 and work gloves. Use
quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult local
building codes and appropriate national electrical codes (in USA,
ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA
C22.1) for special requirements.
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.
Equipment is initially protected under the manufacturer’s standard
warranty; however, this warranty is provided under the condition
that the steps outlined in this manual for initial inspection, proper
installation, commissioning, regular periodic maintenance, and
everyday operation of the equipment be followed in detail. This
manual should be fully reviewed and understood in advance of
initial installation, start-up, and any maintenance. Should any
questions arise, please contact your local Sales Representative or
the factory BEFORE proceeding.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or
death.
Before performing service or maintenance operations on unit,
turn off main power switch to unit and install lock(s) and lock -
out tag(s). Unit may have more than one power switch.
CAUTION
CUT HAZARD
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 air conditioning equipment.
42DH, DV 06-30
Direct Drive Blower Fan Coils