Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420019-01
Printed in U.S.A.
Form 42DH-2SI
Pg 1
8-19
Replaces: 42DH-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 . . . . . . . . . . . . . . . . . . . . 5
Step 3 — Connect Cooling/Heating Piping . . . . . . . . 7
Step 4 — Make Electrical Connections . . . . . . . . . . 12
Step 5 — Connect Ductwork . . . . . . . . . . . . . . . . . . 12
Step 6 — Make Final Preparations . . . . . . . . . . . . . 13
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Cooling/Heating System . . . . . . . . . . . . . . . . . . . . . . 13
Air Balance System . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Motor/Blower Assembly . . . . . . . . . . . . . . . . . . . . . . 14
Electronically Commutated Motor (ECM) . . . . . . . . 14
Control Board Adjustment . . . . . . . . . . . . . . . . . . . . 14
Water Balancing System . . . . . . . . . . . . . . . . . . . . . 15
Water Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electric Resistance Heater Assembly . . . . . . . . . . . 16
Cabinet/Control Box Maintenance Light . . . . . . . . . 17
Electrical Wiring and Controls . . . . . . . . . . . . . . . . . 17
Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Filters — Throwaway . . . . . . . . . . . . . . . . . . . . . . . . 17
Filters — Replacement and Installation . . . . . . . . . 17
APPENDIX A — TYPICAL WIRING DIAGRAM
EXAMPLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause explosion, fire, electrical shock or oth-
er 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 quali-
fied installer or agency must use factory-authorized kits or ac-
cessories 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 ex-
tinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult lo-
cal building codes and appropriate national electrical codes (in
USA, ANSI/NFPA 70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the safe-
ty-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, CAU-
TION, 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 signi-
fies hazards which
could
result in personal injury or death.
CAUTION is used to identify unsafe practices, which
may
re-
sult in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which
will
result in en-
hanced installation, reliability, or operation.
Equipment is initially protected under the manufacturer’s stan-
dard warranty; however, this warranty is provided under the
condition that the steps outlined in this manual for initial in-
spection, proper installation, commissioning, regular periodic
maintenance, and everyday operation of the equipment be fol-
lowed in detail. This manual should be fully reviewed and un-
derstood 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, always turn off main power switch to unit and install
lock(s) and lockout 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 06-30
Horizontal Direct Drive Blower Fan
Coils
