Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420017-01 Printed in U.S.A. Form 42S-4SI Pg 1 8-18 Replaces: 42S-3SI
Installation, Start-Up and Service
Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 2
Unpack and Inspect Units . . . . . . . . . . . . . . . . . . . . 2
Protect Units From Damage . . . . . . . . . . . . . . . . . . 2
Prepare Jobsite for Unit Installation . . . . . . . . . . . 3
Identify and Prepare Units. . . . . . . . . . . . . . . . . . . 13
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Step 1 — Place Units in Position . . . . . . . . . . . . . 13
• 42SG, SH, AND SJ UNITS
• 42SU UNIVERSAL ARRANGEMENT
• 42SM UNITS
Step 2 — Make Electrical Connections . . . . . . . . 22
• FACTORY-INSTALLED OPTIONS
• STANDARD WIRING PACKAGES
Step 3 — Make Duct Connections . . . . . . . . . . . . 23
Step 4 — Frame and Finish Unit . . . . . . . . . . . . . . 23
Step 5 — Cut Out Openings for Grilles and
Thermostats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Step 6 — Make Final Preparations . . . . . . . . . . . . 24
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Cooling/Heating System . . . . . . . . . . . . . . . . . . . . 25
Air System Balancing . . . . . . . . . . . . . . . . . . . . . . 26
Water System Balancing . . . . . . . . . . . . . . . . . . . . 26
Water Treatment. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Controls Operation . . . . . . . . . . . . . . . . . . . . . . . . 26
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Excessive Condensation on Unit . . . . . . . . . . . . . 26
To Clean Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Check Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Fan Motor Bearings . . . . . . . . . . . . . . . . . . . . . . . . 27
Clean Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Clean Electric Heater . . . . . . . . . . . . . . . . . . . . . . . 27
Electrical Wiring and Controls . . . . . . . . . . . . . . . 27
Valves and Piping . . . . . . . . . . . . . . . . . . . . . . . . . 27
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
APPENDIX A — BLOCK-OUT
CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . .29
APPENDIX B — POTENTIOMETER
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .32
APPENDIX C — EVO/ECM 4-SPEED
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .33
START-UP CHECKLIST FOR 42S SERIES
FAN COIL AIR CONDITIONERS . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation of this unit can be hazardous due to electrical
components and equipment location (such as an elevated
structure). Only trained, qualified installers and service me-
chanics should install and service this equipment.
See Fig. 1 for the Proposition 65 warning label.
CAUTION
When installing this unit, observe precautions in the liter-
ature, labels attached to the equipment, and any other
safety precautions that apply.
• Follow all safety codes.
• Wear safety glasses and work gloves. Never wear
bulky or loose fitting clothing when working on any
mechanical equipment. Gloves should be worn for
proper protection against heat and other possible inju-
ries. Safety glasses or goggles should always be worn
when drilling, cutting, or working with chemicals
such as refrigerants or lubricants.
• Use care in handling and installing this unit.
• Never pressurize any equipment beyond specified test
pressures. Always pressure-test with an inert fluid or
gas such as clear water or dry nitrogen to avoid possi-
ble damage or injury in the event of a leak or compo-
nent failure during testing. Always protect adjacent
flammable material when welding or soldering. Use a
suitable heat-shield material to contain sparks or drops
of solder. Have a fire extinguisher readily available.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury or
death.
Before performing installation, service, or maintenance opera-
tions on unit, turn off main power switch to unit and install
lock(s) and lockout tag(s). Ensure electrical service to unit
agrees with voltage and amperage listed on the unit rating
plate. Unit may have more than one power switch.
42S Series
Fan Coil Air Conditioners
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