P/N 475114 Rev. F 9/2020 MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide
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Contents
Heater Identification Information (HIN) / Code Requirements / References ..................................................................................................... ii - iii
Heater Identification Information (HIN) ............................................................................................................................................................. iii
Warnings and Safety Instructions / Consumer Information / General Specifications .............................................................................. iv - viii
Operating the Control Panel ..................................................................................................................................................... ix
Section 1. Operation Instructions ......................................................................................................... 1
Operating Instructions / Basic System Operation ........................................................................................................................... 1
Heater HSI (Hot-Surface Ignition) Lighting/Operation .................................................................................................................... 1
Start-up and Operation / Before You Start ....................................................................................................................................... 1
Operating Instructions ....................................................................................................................................................................... 2
To Turn Off Gas to Appliance ............................................................................................................................................................ 2
Safety Controls: Air Flow Switch (AFS) / Water Pressure Switch / High Limit Devices .............................................................. 3
Operation of Ignition Module ............................................................................................................................................................. 4
Temperature Setting / Adjust The Maximum Temperature Set Point ............................................................................................ 4
Section 2. Installation Instructions ....................................................................................................... 5
Heater Description ................................................................................................................................................................................ 5
Sequence of Operation ......................................................................................................................................................................... 5
Putting the Heater into Service ............................................................................................................................................................. 6
Specifications ....................................................................................................................................................................................... 6
Plumbing Connections .......................................................................................................................................................................... 7
Water Connections ............................................................................................................................................................................... 7
Valves ................................................................................................................................................................................................... 8
Manual By-Pass ................................................................................................................................................................................... 8
Below Pool Installation ......................................................................................................................................................................... 8
Gas Connections / Gas Line Installation .............................................................................................................................................. 9
Sediment Trap/Drip Leg ...................................................................................................................................................................... 9
Testing Gas Leaks and Gas Pressure .................................................................................................................................................. 10
Inlet Gas Pressure Requirements ........................................................................................................................................................ 10
Outdoor Installation / Heater Clearances ............................................................................................................................................. 11 - 12
Indoor Venting— General Requirements / Heater Clearances / Outside Vent cover Removal .......................................................... 13
Combustion Air Supply / Corrosive Vapors and Possible Causes ................................................................................................... 14
Horizontal or Vertical Venting - Using Single-Wall Stainless Gas Vent .......................................................................................... 15
Connecting Single-Wall Stainless Steel Vent to the Heater ............................................................................................................. 16 - 17
Direct Air Intake Duct with 76 mm (3 in - UK) PVC Pipe (Indoor Installation) .................................................................................. 18
Control Panel Indexing ......................................................................................................................................................................... 18
Final Installation Check ........................................................................................................................................................................ 18
Electrical Connections .......................................................................................................................................................................... 19
Fireman’s Switch Connection/Remote Control Connections ................................................................................................................ 20
Heater Wiring Diagram / Heater Electrical Schematic Ladder Diagram ............................................................................................... 21 - 22
Section 3. Troubleshooting .................................................................................................................... 23
Initial Troubleshooting and Troubleshooting Chart ............................................................................................................................... 23
Heater Will Not Fire Troubleshooting (A, B, C, D) ................................................................................................................................ 24 - 27
LED Diagnostics (AGS, AFS, HLS, PS Thermistor) ............................................................................................................................. 28 - 29
Burner / Heat Exchanger Troubleshooting ........................................................................................................................................... 30
Section 4. Maintenance Instructions .................................................................................................... 31
Care and Maintenance ......................................................................................................................................................................... 31
De-Limiting the Heater .......................................................................................................................................................................... 31
Pressure Relief Valve ........................................................................................................................................................................... 31
After Start-Up ........................................................................................................................................................................................ 32
Check Water Flow ................................................................................................................................................................................ 32
Spring, Fall (Autumn) and Winter Operation ....................................................................................................................................... 32
Maintaining Pool Temperature / Energy Saving Tips ........................................................................................................................... 33
Chemical Balance ................................................................................................................................................................................. 33 - 34
Replacement Parts ............................................................................................................................................................................... 35 - 39
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