Carrier 50PM20 Installation Instructions Manual

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Installation Instructions
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ......................... 1
INSTALLATION .................................... 2
Step 1 - Provide Unit Support ......................... 2
Step 2 - Remove Shipping Rails ....................... 2
Step 3 - Rig and Place Unit ........................... 2
Step 4 - Field Fabricate Ductwork ...................... 9
Step 5 - Make Unit Duct Connections ................... 9
Step 6 - Install Flue Hood and Inlet Hood ............... 10
Step 7 - Trap Condensate Drain ...................... 10
Step 8 - Install Outdoor Air Hood ..................... 24
Step 9 - Position Optional Power Exhaust or
Barometric Relief Damper Hood ...................... 25
Step 10 - Non-Fused Disconnect ..................... 25
Step 11 - Install All Accessories ...................... 26
PRE-START-UP ................................... 26
START-UP ........................................ 27
SERVICE ......................................... 34
TROUBLESHOOTING .............................. 44
APPENDIX A - FAN PERFORMANCE TABLES ........ 47
APPENDIX B - ADDITIONAL START-UP DATA ....... 51
UNIT START-UP CHECKLIST ....................... 54
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform the basic maintenance functions
of replacing filters. All other operations should be performed by
trained service personnel. When working on air-conditioning
equipment, observe precautions in the literature, tags and labels
attached to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguishers
available for all brazing operations.
Recognize safety information. This is the safety-alert symbol /_.
When you see this symbol on the furnace and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. 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 a hazard
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.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
iniury, death and/or equipment damage.
Puron® (R-410A) refrigerant systems operate at higher
pressures than standard R-22 systems. Do not use R-22
service equipment or components on Puron refrigerant
equipment.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could cause personal
iniury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit
rating plate.