Pentair RS-485 INSTALLATION INSTRUCTIONS
RS-485 COMBO CONVERSION REPLACEMENT KIT
USA (P/N 476211) AND AUSTRALIA (P/N 462049)
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
RS-485 Combo Conversion Instructions for USA and Australian heater models
The following instructions describe how to replace the PCBA, Membrane Pad, Ignition Control Module
(ICM) and Wiring Harness in a MasterTemp or Sta-Rite pool and spa heater (USA and Australia
models) that doesn’t have RS-485 communication capability.
Contents
RS-485 Combo Conversion Replacement (USA) page 2-5
RS-485 Combo Conversion Replacement (Australia) page 6-8
P/N 476251.A 9/2020
1
RS-485 COMBO CONVERSION REPLACEMENT INSTRUCTIONS (USA)
476211 RS-485 COMBO CONVERSION (USA)
Parts List
P/N Description Qty.
466225 WH HRN US W/ FC 1
476221 ICM W/ FLAME SENSE US 1
476201 MEM PAD MT 6 BUTTONS 1
476199 PCBA MT/MET HTR W/RS485 1
476251 INSTALLATION INSTRUCTIONS 1
462049 RS-485 COMBO CONVERSION (AUSTRALIA)
Parts List
P/N Description Qty.
476226 WH HRN AUSTRALIA W/ FC 1
476222 ICM W/ FLAME SENSE AU 1
476251 INSTALLATION INSTRUCTIONS 1
476201 MEM PAD MT 6 BUTTONS 1
476199 PCBA MT/MET HTR W/RS485 1
2
RS-485 COMBO CONVERSION REPLACEMENT INSTRUCTIONS (USA)
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
CAUTION! Before starting: Always disconnect AC power to the heater before proceeding with
the wire harness replacement instructions.
CAUTION!: Before unplugging ICM connector plugs, be sure to match the
wire identication on both the existing and replacement wire harnesses.
To replace the membrane pad PCBA on a MasterTemp
®
Heater
To open the heater:
1. Remove left side panel from the heater (Fig. 1 and Fig. 2). Remove the four (4) wing nuts holding the top in place.
FIG. 1.
MasterTemp
2. Disconnect the wire harness from the back of the PCBA.
3. Disconnect the membrane pad from the PCBA.
4. Remove the four (4) screws holding the PCBA and remove the PCBA.
5. Peel the membrane pad from the top panel by pulling one of the corners. Set the panel aside.
6. Disconnect the wires from the ICM. Remove the two (2) screws that secure the ICM to the junction box.
7. Route the membrane pad connector through the top panel slot in order to connect it to the control board. Peel off the membrane
pad backing off the new membrane.
8. Align the membrane pad with the bottom of the recess in the lid and press firmly into place. Smooth the membrane pad with your
hand.
9. Place new PCBA into underside of cover and secure with four (4) mounting screws.
10. Reconnect the membrane pad to the PCBA (note the arrow on the membrane connector should be on the bottom)the upper jackets
halves from the heater (Fig. 3).
11. Place lid assembly aside and continue with replacing the ICM and Wire Harness.
STD Heater
FIG. 2.
MasterTemp 125 Heater
3
RS-485 COMBO CONVERSION REPLACEMENT INSTRUCTIONS (USA)
F
I
L
T
E
R
PUMP
AUX
1
AUX
2
H
IG
H
SPE
ED
L
OW
S
PE
ED
BOOS
TE
R P
UM
P
Retaining
Pins
To replace the membrane pad and PCBA on a Sta-Rite Max-E-Therm
1. Unbolt the four bolts and separate the jackets halves. Pull hair pin clips. (Fig. 3).
2. Press the plastic clips on the control panel assembly.
3. Lift control panel assembly off of support plate.
4. Disconnect the connectors from the control panel assembly.
FIG. 3.
Max-E-Therm Heater
5. Disconnect the wire harness from the back of the PCBA.
6. Disconnect the membrane pad from the PCBA.
7. Remove the four (4) screws holding the PCBA and remove the PCBA
8. Peel the membrane pad from the top panel by pulling one of the corners.
9. Route the membrane pad connector through the top panel slot in order to connect it to the control board. Peel off the membrane
backing
10. Align the membrane pad with the bottom of the recess in the lid and press firmly into place. Smooth the membrane pad with your
hand.
11. Place new PCBA into underside of cover and secure with four (4) mounting screws.
12. Reconnect the membrane pad to the PCBA (note the arrow on the membrane connector should be on the bottom)the upper
jackets halves from the heater (Fig. 3).
13. Route the membrane pad connector through the top panel slot to connect to the control board. Peel of the membrane backing.
Align the membrane pad properly onto the area of the top panel.
14. Set the lid assembly aside and continue replacing the ICM and wire harness replacing it with the new Control Board with RS-485
communication. Note: The PCBA is not serviceable.
Control Panel
FIG. 3b
AUX
2
EED
SP
W
LO
PUMP
TER
OS
BO
D
UX
PEE
S
A
IGH
1
H
ER
LT
FI
P
PUM
Heater Display
Cover
AUX
2
D
SPEE
W
LO
P
M
PU
TER
BOOS
D
E
AUX
H SPE
G
1
HI
FILTER
ON
F
F
O
NT
VE
SS
E
PR
B
TA
T
LO
I
P
PUMP
Membrane Pad
(Included with Kit)
Control Board
Enclosure Kit
Control Board
Index Plate
FIG. 4.
4
RS-485 COMBO CONVERSION REPLACEMENT INSTRUCTIONS (USA)
To replace the Ignition Control Module:
1. Disconnect all connector plugs and wires from the legacy
ICM. Remove the screws from the legacy ICM. Remove
ICM from the heater. (Fig. 5).
2. Install the new ICM into the heater Control Box compartment. Secure the unit with the two (2) screws.
FIG. 5.
To replace the wire harness:
- LEGACY WIRE HARNESS (USA) (P/N 42001-0104):
Disconnect all connector plugs and wires from all heater
components. Remove the wire harness from the heater.
- Install wire harness (USA) (P/N 476221):BEFORE
YOU START, LAY OUT THE WIRING HARNESS.
3. Bring the Flat 5-pin plug, 2-pin plug and multi-pin
connector into the control box. Install the bushing in the
hole. Also, bring the Flame current cable into the control
box. (Fig. 7).
FIG. 7.
4. Route the Red and Green wires into the Control Box
through the bottom hole. Plug the Fireman’s jumper into
the terminal board. Install bushing. Be sure the bushings
are install when routing the wires into the Junction box.
(Fig. 8). Note: The plugs are shown in the control box and
the Fireman’s jumper installed.
1. Cut one tie to release two jumpers.
2. Route the 12-pin plug in the control box from the back.
The plug is shown from outside the Control Box. (Fig. 6.)
Note: Narrow key hole in the upper right corner of the
plug.
FIG. 6.
FIG. 8.
5
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