Tec-Notes for Firestorm Water Heaters Current Documents Safety | Publication number 1-10-213 The Heatec commitment and warranty | Publication number 7-04-138 | Revised 4-14-10 Setting Heatec (Yokogawa) UT150 modulating controller | Publication number 1-10-214 Controls | Publication number 1-10-215 Burner management controls | Publication number 1-10-216 Operation | Publication number 1-10-217 Maintenance | Publication number 1-10-218 Troubleshooting | Publication number 1-10-219 Troubleshooting modulation motors | Publication number 1-10-220 Wiring diagram, power | Publication number 4001905 Wiring diagram, controls, Page 1 | Publication number 4001906 Wiring diagram, controls, Page 2 | Publication number 4001907