Install The Isolation Valves - Rinnai ThermaCirc360 RUR199i Installation And Operation Manual

3.7 Install the Isolation Valves

Isolation valves (included with water heater) provide the ability to isolate the water heater from the structure's
plumbing and allow quick and easy access to flush the heat exchanger. The supplied isolation valves meet American
National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) and are ANSI/NSF 61 approved for potable water.
To install isolation valves:
1. Apply thread sealant to the exposed threads of the Cold Inlet and Hot Outlet of the water heater.
2. Hand tighten the Union Fitting to the Cold Inlet and Hot Outlet of the water heater.
3. With a wrench, tighten the Union Fittings. Do not tight more than 2 turns past hand tight.
4. Position the Hot Isolation Valve (Red) and Gasket below the Union Fitting on the Hot Outlet side of the water
heater.
5. Hand tighten the Union Nut of the Hot Isolation Valve (Red) to the Union Fitting.
6. Rotate the Drain Valve to an accessible position. With a wrench, tighten the Union Nut to the Union Fitting.
7. Repeat steps 4 - 6 for the Cold Isolation Valve (Blue).
8. Connect the Cold Isolation Valve (Blue) to the Cold Water Supply Line.
9. Connect the Hot Isolation Valve (Red) to the Hot Water Supply Line.
10. Ensure that both Drain Valves are in the closed position before turning on water supply.
Hot Outlet
Hot Isolation Valve
(Red)
Rinnai Tankless Water Heater Installation and Operation Manual
Cold Inlet
Union Fitting
Gasket
Union Nut
Drain Valve
Cold Isolation Valve
(Blue)
NOTICE:
DO NOT use pipe dope
or thread sealant on
union fitting with
gasket.
NOTICE:
When unscrewing the
union fitting, be careful
not to lose the gasket.
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