OUTDOOR UNIT MODIFICATIONS
1.Disconnect all high and 24V voltage power to the unit and the control circuit.
2.Mark and disconnect all thermostat, sensor and low volt- age control connections from the YorkGuard IV control.
3.Remove the six #10 screws holding the control and remove the control.
4.Using five of the six screws removed in Step 3, mount the new board in place (omit the top middle screw).
5.Reconnect the wires removed in Step 2.
INDOOR UNIT MODIFICATIONS
NOTE: Indoor transformer should be rated for a minimum of 40VA. Replace transformer if necessary.
FOSSIL FUEL APPLICATION - The YorkGuard VI control does not require an
START-UP OPERATION
1.Reapply power to the unit and the control voltage circuit.
2.The LED on the defrost control will flash on and off when there is power to the control and it is working properly.
3.Verify unit operation.
For more information on control operation, refer to “OPER-
ATION INSTRUCTIONS - “DEMAND DEFROST CONTROL BOARD” on upgnet.com.
Subject to change without notice. Published in U.S.A. | |
Copyright © 2009 by Johnson Controls, Inc. All rights reserved. | Supersedes:Nothing |
Johnson Controls Unitary Products
5005 York Drive
