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Connect the Water
Heater to the
Water Supply
Water connections to the Commercial Hybrid
System should follow all state and local plumbing
codes.
If this is a standard installation, refer to the Piping
Diagram for basic installation.
1. Use of this layout should provide a trouble-free
installation for the life of the water heater.
Before making the plumbing connections,
locate the COLD water inlet and the HOT water
outlet.
•
The COLD water inlet is a 1-1/2 in. MNPT
fitting on the lower portion of the tank
below the tankless unit.
•
The HOT water outlet is a 1-1/2 in. MNPT
fitting located at the top of the tank. Install
a shut-off valve close to the water heater in
the cold water line. It is recommended that
unions be installed in the cold and hot
water lines so that the water heater can be
easily disconnected, if servicing is required.
2. When assembling the hot and cold piping, use a
good food grade pipe joint compound, and
ensure all fittings are tight. It is imperative that
open flame is not applied to the inlet and outlet
fittings, as heat will damage or destroy the
plastic lined fittings. This will result in
premature failure of the fittings, which is not
covered by the warranty.
38
Fill the System
DO NOT OPERATE THIS WATER HEATER UNLESS IT IS
COMPLETELY FULL OF WATER. To prevent damage to
the water heater, all air must be relieved from the
system and a hot water fixture must be flowing water
before the water heater is plugged in and turned on.
To ensure safe and effective operation of the water
heater, use the following filling procedure. To fill the
water heater:
1. Ensure the drain valve located at the bottom of
the tank is closed.
2. Open the nearest hot water fixture in the
plumbing system.
3. Open the cold water supply valve to the water
heater.
4. Keep the hot water fixture open until the tank is
filled and constant flow is obtained at the fixture.
5. Check water heater connections and plumbing
system for damage or leaks. Repair if needed.
NOTICE
DO NOT OPERATE THIS WATER HEATER UNLESS IT IS
COMPLETELY FULL OF WATER
Rinnai Commercial Hybrid System Installation and Operation Manual
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