Bosch GWH 260 PN Service Bulletin Booklet page 18

Compact water heaters
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REPLACING ECO/TEMPERATURE
LIMITER
MODELS:
1000P, 1600P, 1600H,
260PN, 425PN, 425HN
The ECOs/temperature limiters are overheat protection
sensors that will shut off all gas to the water heater in
the event of overheating.
Note
Note
Note
Note: If experiencing frequent pilot outages during or
Note
just after use, first test the temperature limiter/ECO
before replacing it. See Bulletin CT-02 Ther mocouple
and pilot test.
Tools
Philips head screwdriver, pliers and 22mm or adjust-
able wrench
Replacing lower ECO/temperature limiter
(not included on model 1000P)
1. Close installer supplied cold water isolation valve to
the water heater.
2. Locate the lower ECO on the ½" copper pipe exiting
the bottom left side of the heat exchanger (See F ig. 1).
3. Using pliers, disconnect both spade connections to the
ECO.
4. Using a 22mm or adjustable wrench, unscrew the ECO
from the ½" copper pipe. Be careful not to overstrain
the copper pipe.
5. Install new ECO and reconnect wires from electromag-
net and flue gas sensor . Wire orientation/polarity does
not mat ter when making this connection.
6. Turn on cold water supply and return the water heater
to service.
FIGURE 1
©BBT NORTH AMERICA CORPORATION
Bosch Group
W W W W W ARNIN
ARNIN
ARNIN
ARNING G G G G
ARNIN
LP & N
LP & N
G ARE EXTREMEL
G ARE EXTREMEL
LP & NG ARE EXTREMEL
LP & N
LP & N
G ARE EXTREMELY FL
G ARE EXTREMEL
T T T T T AKE EXTRA PRECA
AKE EXTRA PRECA
AKE EXTRA PRECA
AKE EXTRA PRECAUTIONS WHEN
AKE EXTRA PRECA
PERF
PERFORMIN
PERF
ORMIN
ORMIN
ORMIN G ANY W
G ANY WORK T
G ANY W
G ANY W
PERF
PERF
ORMIN
G ANY W
Replacing upper ECO/temperature limiter
1. Close installer supplied cold water isolation valve to
the water heater.
2. Locate the upper ECO installed on the copper bend on
the upper right side of the heat exchanger (Fig. 2)
3. Using pliers disconnect both spade wire connections
to the ECO.
4. Remove Philips head screw from the ECO bracket.
5. Slide bracket and ECO away from the heat exchanger
and separate the bracket from the ECO. Do not loose
the bracket.
6. Insert new ECO into the bracket. If a new bracket is
provided with the ECO, there is no need to reuse the
old bracket.
7. Slide ECO and bracket onto the mounting of the heat
exchanger. Heat exchanger mounting should reside be-
tween the ECO and bracket. (See Fig. 2)
8. Insert Philips head screw through ECO, heat exchanger
mount and tighten into ECO bracket.
9. Reconnect wires from the flue gas sensor and the ther-
mocouple to the ECO. Wire orientation/polarity does
not mat ter when making t his connection.
10. Turn on cold water supply and return water heater to
service.
FIGURE 2
340 Mad River Park, Waitsfield, VT 05673
Y FL
Y FL
AMMABLE SO
AMMABLE SO
Y FL
Y FLAMMABLE SO
AMMABLE SO
AMMABLE SO
UTIONS WHEN
UTIONS WHEN
UTIONS WHEN
UTIONS WHEN
ORK T
ORK T
ORK TO THE HEA
O THE HEATER
O THE HEA
O THE HEA
TER
TER
TER
ORK T
O THE HEA
TER
Bosch Water Heating
CT-24
page 1 of 1
rev 10/06

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Cwh 1000 pGwh 1600 hGwh 425 hnGwh 425 pnGwh 1600 p ng

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