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Item #
1
Hot Water Manifold
2
Cold Water Manifold
3
GTK03U pump and two unions
4
Flow Restricting Bypass
5
Flow Restrictor Bypass Adapter
6
Grundfos Crossover Valve
7
Control-R™ Wi-Fi Module
8
Pipe Cover
•
Teflon Tape
•
Hot and Cold Water Isolation
Valves (supplied with water heater)
Item
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1
1
1
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1
1
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Tankless Water Heater
Tankless Water Heater
Installation and Operation Manual
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Summary of Contents for Rinnai GTK03U
- Page 1 Item # Item Hot Water Manifold Cold Water Manifold GTK03U pump and two unions Flow Restricting Bypass Flow Restrictor Bypass Adapter Grundfos Crossover Valve Control-R™ Wi-Fi Module Pipe Cover • Teflon Tape • Tankless Water Heater • Hot and Cold Water Isolation •...
- Page 2 (Figure 1). Figure 1 Lay water heater flat. 2. Wrap Teflon tape (field-supplied) around the threads of the cold water inlet and hot water outlet (Figure 2). Figure 2 Hot water outlet Cold water inlet GTK03U Pump Kit Assembly Instructions...
- Page 3 Union Nut Hot water outlet Hot water manifold 3/4 in. Union Nut 4. Install one of the pump union fittings onto the cold water inlet (Figure 4). Figure 4 Cold water inlet Pump union fitting GTK03U Pump Kit Assembly Instructions...
- Page 4 6. Connect the pump to the union on the cold water inlet, making sure the pump gasket is in place. The arrow on the side of the pump must be pointed up towards the water heater for correct installation (Figure 6). Figure 6 Pump gasket GTK03U Pump Kit Assembly Instructions...
- Page 5 8. Connect the cold water manifold assembly to the inlet of the pump. Ensure the pump union gasket is in place before connecting (Figure 8). Figure 8 Pump union gasket Cold water manifold assembly GTK03U Pump Kit Assembly Instructions...
- Page 6 9. Install the flow restricting bypass adapter onto the hot water manifold (Figure 9). Figure 9 Flow Restricting Bypass Adapter 10. Thread the flow restricting bypass onto the hot and cold water manifolds (Figure 10). Figure 10 Flow Restricting Bypass GTK03U Pump Kit Assembly Instructions...
- Page 7 12. Install the tankless water heater onto the wall and remove the front cover (Figure 12). For detailed instructions, refer to the Tankless Water Heater Installation and Operation Manual supplied with the tankless water heater. Figure 12 GTK03U Pump Kit Assembly Instructions...
- Page 8 13. Route the pump power cable through the hole in the bottom of the unit and secure it from the inside with the supplied locknut (Figure 13). Figure 13 Secure the pump power cable with the locknut GTK03U Pump Kit Assembly Instructions...
- Page 9 The connector from the tankless water heater has a black and white wire with the label “Cut wire to connect to pump.” DO NOT CUT THE WIRE. To connect to the pump, remove the protective cap from the wire lead and plug the GTK03U connection into it. Push in...
- Page 10 WARNING RISK OF ELECTRIC Electrical Diagram SHOCK The Grundfos GTK03U Pump’s power source is from the tankless water heater. All Components Within Disconnect this supply connection before Dashed Line Inside of servicing.
- Page 11 The tankless water heater must not be connected to a system that was previously used with a non-potable water heating appliance. • Ensure that the water filter on the water heater is clean and installed. GTK03U Pump Kit Assembly Instructions...
- Page 12 25. Plumb the hot water supply line to the 3/4 in. MNPT connection marked “HOT.” NOTE Make sure the water lines to the water heater fit within the confinements of the pipe cover. 26. Install the pipe cover using the installation instructions included in the pipe cover box. GTK03U Pump Kit Assembly Instructions...
- Page 13 Dedicated Return Line Plumbing Diagram Gas Supply Cold Water Supply Line 3/4 in. Return Line Recommended Building Outlets GTK03U Pump Kit Assembly Instructions...
- Page 14 Crossover Recirculation Plumbing Diagram Install crossover valve at the furthest fixture from the tankless water heater. Gas Supply Hot Water Supply Line Cold Water Supply Line Hot Water Fixtures Crossover Valve GTK03U Pump Kit Assembly Instructions...