460906 Rev. D 8/2020 MASTERTEMP
125 Pool and Spa Heater Installation and User’s Guide
9
Contents (Continued)
Section 1. Installation Instructions (Continued) ......................................................................... 34
Electrical Connections ............................................................................................................................................... 34
Fireman’s Switch Connection/Remote Control Connections ................................................................................. 35
MasterTemp 125 Heater Terminal Board/Control and Connection Wiring Diagram ............................................. 35
Heater Bonding ........................................................................................................................................................ 36
Connecting the MasterTemp Heater to the IntelliCenter Control System Load Center via RS-485 .......................... 37
Connecting the RS-485 Cable from the Heater to the Load Center ...................................................................... 38
Heater Wiring Diagram (3-Wire System) ............................................................................................................... 40
Heater Electrical Schematic Ladder Diagram ........................................................................................................ 41
Section 2. Operations .............................................................................................................. 42
Basic System Operation ............................................................................................................................................ 42
HSI (Hot-Surface Ignition) Lighting/Operation ........................................................................................................... 42
Start-Up and Operation Before Start-Up ................................................................................................................... 42
Operating Instructions .............................................................................................................................................. 43
To Turn Off Gas to Appliance ............................................................................................................................ 43
Safety Controls/Air Flow Switch (AFS) ...................................................................................................................... 44
Water Pressure Switch .......................................................................................................................................... 44
High Limits (Safety Device) ................................................................................................................................... 44
Operation of Ignition Module (ICM) ....................................................................................................................... 45
Diagnostic Indicator ........................................................................................................................................... 45
Error PS Message ................................................................................................................................................. 45
Control Panel ............................................................................................................................................................. 46
Menu Navigation ....................................................................................................................................................... 46
Operating the Heater ................................................................................................................................................. 46
Menu ..................................................................................................................................................................... ... 47
Section 3. Troubleshooting ..................................................................................................... 48
Initial Troubleshooting / Error and Fault Codes ......................................................................................................... 49
Troubleshooting Instruction ....................................................................................................................................... 50
Troubleshooting Chart (Important Read Me First) ..................................................................................................... 50
Heater Will Not Fire - A ......................................................................................................................................... 51
Heater Will Not Fire - B ......................................................................................................................................... 52
IGN is On (Alarms: AGS, AFS, HLS, PS, EO1, or 126 ............................................................................................. 53
Diagnostic Alarms: AGS, AFS, HLS, PS, EO1, or 126 .............................................................................................. 54
Diagnostic Alarms: ERR SFS .................................................................................................................................... 55
Burner Troubleshooting ............................................................................................................................................. 56
Heat Exchanger Troubleshooting .............................................................................................................................. 56
Section 4. Maintenance ........................................................................................................... 57
Care and Maintenance / De-Iiming The Heater ......................................................................................................... 57
Pressure Relief Valve (Not Factory Installed) ........................................................................................................... 57
After Start-Up (Checking Water Flow) ....................................................................................................................... 58
After Start-Up / Spring, Fall and Winter Operation .................................................................................................... 58
Maintaining Pool Temperature .................................................................................................................................. 59
Energy Saving Tips ................................................................................................................................................... 59
Chemical Balance ..................................................................................................................................................... 59-60
Section 5. Replacement Parts ................................................................................................ 61-65
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