OPERA
TION & CONTROLS
Temperature Sensor – Lockout
1. Low-Temp Lockout - a. Inlet Water Temperature below 36ºF (2ºC). Heater will not operate
(Prolonged operation with inlet temperatures below 50ºF (10ºC) will create condensation
that will damage the heater). b. For cold weather operation, consider maintaining a preset
temperature of 50ºF to 70ºF (10ºC - 21ºC), or the lowest point at which condensation does
not occur. Set temperature can then be raised to the desired swim temp.
2. Over-Temp Lockout - Outlet Temp was higher than 180°F (82.0°C). Check water flow.
3. Flue Extreme Low - Flue temperature is below 140ºF (60ºC). Service required.
4. Flue Over Temp - Flue temperature is higher than 390ºF (199ºC). Power must be cycled to
clear the fault. Service attention is required.
1a
1b
1.
25
2
4
3
