Technical Guide

Subject to change without notice. Published in U.S.A. 5127524-YTG-A-0815
Copyright © 2015 by Johnson Controls, Inc. All rights reserved. Supersedes: Nothing
York International Corp.
5005 York Drive
Norman, OK 73069
UNIT TYPICAL ROOF CURB INSTALLATION (Gas model shown)
EXTERNAL STATIC PRESSURE SETUP
To measure external static pressure:
• Measure the supply air static pressure
• Record this positive number
• Measure the return air static pressure
• Record this negative number
• Treat the negative number as a positive and add the two numbers
together
• This is total system static
SUPPLY
AIR DUCT
TO POWER SUPPLY
RETURN
AIR DUCT
FIELD-SUPPLIED
DISCONNECT
SWITCH
CONTROL WIRING TO
INDOOR THERMOSTAT
TO GAS
SUPPLY LINE
MANUAL GAS
SHUTOFF VAVLE
ROOF CURB
ROOF
CONDENSATE
DRAIN
A0326-001
A0435-001
RETURN AIR
DUCT
SUPPLY AIR
DUCT