Pentair Fenwal User Manual
IGNITION CONTROL MODULE (ICM) REPLACEMENT KIT
USA (P/N 476224) AND AUSTRALIA (P/N 476223)
FOR MASTERTEMP® AND MAX-E-THERM® POOL AND SPA HEATERS
INSTALLATION INSTRUCTIONS
FAILURE TO FOLLOW ALL INSTRUCTIONS AND WARNINGS CAN RESULT IN SERIOUS BODILY INJURY OR DEATH. THIS PRODUCT SHOULD BE
INSTALLED AND SERVICED ONLY BY A QUALIFIED POOL SERVICE
PROFESSIONAL. INSTALLERS, POOL OPERATORS AND OWNERS MUST READ
THESE WARNINGS AND ALL INSTRUCTIONS IN THE HEATER
INSTALLATION AND USER’S GUIDE BEFORE USING THIS PRODUCT.
THESE INSTRUCTIONS MUST BE LEFT WITH THE POOL OWNER.
Pentair Water Pool and Spa heater related products are available at:
https://www.pentair.com/en/products/pool-spa-equipment/pool-heaters.html
Call (800) 831-7133 for additional free copies of these instructions.
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS - SAVE THESE INSTRUCTIONS
Fenwal® Ignition Control Model (ICM)
The following instructions describe how to replace an existing Ignition Control Module (ICM) into a
MasterTemp or Sta-Rite pool and spa heater (USA and Australia models) that doesn’t have RS-485
communication capability.
Contents
ICM Replacement (USA) page 2-5
ICM Replacement (Australia) page 6-9
P/N 476249.A 9/2020
1
HEATER ICM REPLACEMENT INSTRUCTIONS (USA)
P/N 476223 Parts List
P/N Description Qty.
476221 ICM F/FLAME SENSE DOM 1
476206 ADAPT 6 PIN FOR DOM ICM AFTR RS485 1
476208 ADAPT F1-F2 FOR DOM ICM AFTER RS485 1
476202 ADAPT 5PIN FOR DOM ICM AFTER RS485 1
476213 LED WIRE ADAPTER 1
476249 INSTALLATION INSTRUCTIONS 1
ICM Fenwal
®
(USA) P/N 476221
ICM
FENWAL
ICM
FENWAL
F2
F1
N/A
IND
TH
P/N: 476206
P/N: 476208
IND
TH
F2
F1
HARNESS
HARNESS
ICM
FENWAL
FENWAL
ICM
S2
L2
S1/240
L1
S1/120
S2
L2
S1/240
N/A
L1
S1/120
HARNESS
P/N: 476202
RED
2 1
P/N: 476213
2
HEATER ICM REPLACEMENT INSTRUCTIONS (USA)
FIGGGGG. 3
. 3
. 3. 3
. 3aa
a
33. 3
. 3333b
. 44. 4
. 4
scscwswsws
.
.
When installing this kit, basic safety precautions should always be followed. Read and follow all instructions.
Required installation tools:
• Powered socket/nut driver
• 1/4” nut driver bit
• 5/16” socket and nut driver
• 3/8” nut driver
To replace the ICM on a MasterTemp® or Max-E-Therm® Heater:
1. MasterTemp Heater: Remove left side panel from the heater (Fig. 1
and Fig. 2).
CAUTION!: Before unplugging ICM connector plugs, be sure to match
the wire label on both the existing and replacement wire harnesses.
5. Connect the ICM to wire adapter (P/N 476208) for F1
and F2 as shown in Fig. 5. One end of the adapter is
a two position Molex
ICM. The other end of the adapter is a ¼” male quick
connect terminal.
F1/F2
WIRE
ADAPTER
®
connector that connects to the
FIG. 1.
MasterTemp
STD Heater
FIG. 2.
MasterTemp 125 Heater
2. Max-E-Therm Heater: Remove the four (4) bolts from the heater
jackets. Remove, see Fig. 3.
FIG. 3.
Max-E-Therm Heater
3. LEGACY ICM (P/N 42001-0100): Disconnect all connector
plugs and wires from the legacy ICM. Remove the two (2)
mounting screws from the legacy ICM. Remove the legacy ICM
unit from the heater.
4. Install the ICM (P/N 476221): Install the ICM into the heater
Junction Box compartment. Secure the unit with the two (2)
screws.
FIG. 3a
FIG. 3b
FIG. 5.
6. Connect the wire adapter (P/N 476202) with five
position connector housing to the ICM (see Fig. 6).
Leave the female connector header on the other end.
FIG. 6.
7. Connect the last wire adapter (P/N 476206) to the
lower right side of the ICM (see Fig. 7.). Notice that
the new ICM no longer has the 24V or R connection
of the ICM in the upper left side. The 24 V is now in
the multi pin connector header. Additionally, one
location of the multi-pin connector is not in use,
which is in between 24V and VAL.
FIG. 4
FIG. 4.
FIG. 7.
3
HEATER ICM REPLACEMENT INSTRUCTIONS (USA)
Now that the wire adapters are connected to the ICM.
Proceed connecting each end of the wire adapters to
the existing wire harness as follow:
8. Connect the male terminals from F1 and F2 to the corresponding F1 and F2 cables of the wire harness as
shown in Fig. 8 and Fig. 9.
11. Connect the yellow/white wire coming from GND in the
ICM to the GND cable as shown in Fig. 12.
FIG. 12.
FIG. 8.
FIG. 9.
9. Connect the Molex connector as shown in Fig. 10. Be
sure the two end flat connections mate properly.
12. Connect the red/yellow wire coming out of the multi-pin
connector to the red/yellow wire coming from the PCBA
as shown in Fig. 13.
FIG. 13.
13. Connect the yellow wire labeled 24V from the multi-pin
connector to the yellow wire labeled 24V coming from
the PCBA as shown in Fig. 14.
FIG. 10.
FIG. 10.
10. The new ICM does not have a 240-spade terminal; this
connection is now in the middle of the Molex connector.
The wire adapter has a cable coming out of the Molex that
needs to be connected to the 240 gray cable as show in
Fig. 11.
FIG. 11.
FIG. 14.
FIG. 7.
14. Reassemble the heater control panel assembly. Be
sure that the control panel can be adjusted without
having to lean over the exhaust vent.
4
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