Page 11
Figure 11. Controls Location.
Rating Plate
Manual
Pilot
Valve
Water
Circulating
Pump
Safety
Gas
Valve
Operating/Safety
Gas Valve
Ignition Control
Flow
Switch
Pressure
Relief
Valve
Power
(On/Off/Auto)
Switch
Pump Time
Delay Relay
Operating
Control
Terminal Strip
In
Out
Hi-Limit
Manual
Main
Gas Valve
on all models/sizes of thes heaters to control the
pool water temperature. The temperature sensor
(thermistor) located in the pool loop piping (see
Section 2.8).
3. Heater Power (On/Off/Auto) Switch:
This provides for constant or automatic pump
operation.
4. High Limit Controls:
a. The manual reset high limit switch is provided
as standard equipment on all heaters. The
temperature sensing bulb of the switch is
always located in the heater outlet. Burners
will automatically shut down whenever
overheating of water occurs.
b. The auto reset limit switch is provided as
standard equipment on all heaters. The
temperature sensing bulb of the switch is field
installed and should be located in the pool
loop piping. (See Section 2.8 for installation
instructions.) Burners will automatically shut
down whenever overheating of water occurs.
5. Flow Switch:
Standard on all sizes/models of these pool
heaters, the flow switch is mounted in a tee fitting
on the outlet header. This is a paddle type switch
which is deflected by the water flow in the fitting.
Any condition which interrupts or decreases the
flow through the secondary loop will shut down
the burners.
6. Low Water Cut Off (optional):
The low water cut off automatically shuts
off heater whenever water level in the heat
exchanger drops below probe level. It is located
in the inlet header and is a manually reset device.
Figure 12 - Safety Components
Manual Reset
High Limit
Flow
Switch
Low Water
Cutoff
(Optional)
Figure 13 - Pilot Burners
Thermo-
couple
Spark Ignition
Standing Pilot
MightyTherm Pool Heater
