SECTION FOUR – Routine Maintenance and Professional Servicing
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The inlet and outlet piping is connected to the
Inlet/Outlet Manifold by 2-inch union connections.
The Manifold must be removed to gain access to the
Internal Bypass Valve or to remove the Manifold
Adapter.
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The Inlet/Outlet Manifold provides the connections
for inlet and outlet water. The Manifold houses the
Thermal Regulator and the Internal Bypass Valve.
See Pages 4-21 and 4-22 for heaters built after 3/15/01.
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To access the Inlet/Outlet Manifold:
1. Turn off the filter pump and all electrical power to
the heater. Close the external Manual Gas Valve.
2. If the heater is below the water level of the pool,
close isolation valves to avoid draining the pool.
3. Disconnect the gas pipe back to the external Manual
Gas Valve so that the heater can move enough to
provide working clearance.
4. Open the Drain Cock under the Manifold Adapter
to drain the heater.
5. Loosen the inlet/outlet piping unions.
6. Unscrew the Thermal Regulator Plug.
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7. Remove the Thermal Regulator along with the
spring attached to it.
8. Remove the 12 bolts holding the Manifold to the
Manifold Adapter; then remove the Manifold from
the Manifold Adapter.
9. Reassemble the Manifold and Manifold Adapter by
reversing Steps 1 through 8 above. Take care to keep
the O-ring sealing surfaces clean, replace the
O-ring and position it properly when reassembling.
10. Tighten bolts only enough to mate the surface of the
Manifold with the surface of the Manifold Adapter.
Tighten bolts in a criss-cross alternating sequence.
Torque bolts to 125-150 in-lbs.
4-24
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Inlet/Outlet Manifold
Assembly
Inlet/Outlet Manifold
(Heaters built before 3/15/01)
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Fire or explosion hazard.
Disconnect all
power to the heater and close the External Manual
Gas Valve before starting this procedure.
The Thermal Governor plug has a
spring behind it.
Restrain it when removing it from
the Manifold to prevent it from flying and possibly
injuring persons nearby.
P/N 42001-0207
