TANKLESS WATER HEATER ISOLATION VALVE KIT INSTALLATION GUIDE
1. Remove the COLD water isolation valve assembly
(identified by the blue handles) from the box.
Disassemble the union connection by loosening the
union nut and removing the tailpiece and gasket.
Ensure that all of the components are present: ¾"
or 1" FNPT tailpiece, gasket, union nut and steel
retaining ring (installed onto the valve body). NOTE:
the union nut is permanently mounted to the valve
body. See photo A
2. Connect the valve assembly's ¾" or 1" FNPT, or
sweat inlet, to the cold water supply line. Apply
thread sealant to the pipe nipple's external threads.
Use the appropriate flux and solder and verify that
the isolation valves are in the open position before
sweating onto the copper tubing. Make sure to
position the valve in a way that the handles are
accessible for operation without any obstruction.
This will typically result in the drain valve's capped
hose threads facing outward toward the user.
See photo B
3. Using the thread sealant recommended by the water heater manufacturer, thread and tighten onto the
water heater's COLD water inlet.
4. Verify that the gasket is centered in the tailpiece. Reconnect the union to the now-installed tailpiece. Brace
the tailpiece and tighten the union nut with the appropriate wrenches.
5. Remove the HOT water isolation outlet valve
assembly (identified by the red handles) and the
pressure relief valve.* Apply thread sealant to
the male threads on the pressure relief valve in
accordance with the water heater manufacturer's
or local code requirements. Install and tighten the
pressure relief valve into the ¾" FNPT connection
located next to the drain valve. Position the outlet of
the pressure relief valve in a downward position. See
photo C. IMPORTANT: Please refer to the additional
instructions for the pressure relief valve. Be careful
not to overtighten the relief valve. Do not tighten
more than two turns past hand tightened.
*Pressure relief valve supplied in some kits
Photo A
Photo B
Photo C
(Continued on next page)
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