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Instruction Sheet
102-076
Replacing Zone Valve Power Head
SUPERSEDES: January 15, 1996 EFFECTIVE: June 30, 1999
Plant I.D. 001-998
Models 555-
570-
Failure to read and follow all instructions carefully before installing or operating this product could cause personal
injury or property damage.
Twist off Power Head
1
", 556-
2
/
1
", 571-
/
2
Procedure to remove power unit and replace with Taco 555-050RP, 555-151RP,
555-154RP or 555-173RP (as applicable) replacement power unit:
1. Turn off room thermostat.
2. Mark wires; 1, 2, and 3, according to terminal strip numbers on power unit.
3. Disconnect wires from power unit terminal strip. Do not allow wires to come in
contact with each other or other objects.
4. Wait two (2) minutes for power unit to cool down.
5. Push down slightly, and rotate power unit clockwise (as shown) to remove, and
lift off.
6. Position new Taco replacement power unit on valve body, push down slightly and
twist counter-clockwise to assemble onto valve body.
7. Reconnect wires marked 1, 2, and 3 to their respective terminals on the replacement power unit.
3
", 557-1", 560-
4
/
3
", 572-1", 573-1
/
4
▲
CAUTION
1
", 561-
2
/
1
", 5101-
/
4
3
", 562-1",
4
/
3
"
/
4
8. Check to make sure that the manual operation lever is in the auto position before
returning the thermostat to normal operation.
(Note: no manual lever on 555-173RP.)
O
D
TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.
TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
IT
O
NCE
. D
O
IT
R
IGHT
.
Printed in USA
Copyright 1999
TACO, Inc.
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