System Controller SC-201-12M, SC-201-24M Installation Manual Potential dangers from accidents during installation and use are divided into the following two categories. Closely observe these warnings, they are critical to your safety. WARNING NOTICE ignored. Denotes content that may result in bodily injury and physical damage when ignored. Requests to Installers WARNING In order to use this product safely, read this installation manual carefully and follow the installation instructions.
Multi-System Wiring The below diagram shows the connection of 3 units to the system controller. When connecting 4 or more units, follow the same procedure. Always connect a remote controller to the system controller. Do not connect the included remote controllers to the individual water heaters. These remote controllers will not be used. The connection of a recirculation pump, operation relay, or operation switch, as shown in the diagram, are optional.
System Select Connectors If this system will be installed with a recirculation system, a storage tank, or with a filtration system, unplug the connector that corresponds to that type of system. * If none of these circulating systems are used, do not unplug these connectors. (1) If the units will be installed in a recirculation system: Disconnect the top connector referenced below as "Recirculation System" (1).
-4- Unit No. 11 Unit No. 10 Unit No. 3 Unit No. 2 Unit No. 1 -24M Only (Size for the maximum flow rates of the units) Cold Water Supply Pipe Gas pipe Remote Controller System Select Connectors * Do not remove these connectors in this type of system. • Insulate or apply heating materials to both the cold water supply piping and the hot water piping to prevent freezing during cold weather and to prevent heat loss through the piping.
Hot Water Supply Unit No. 11 -5- Unit No. 10 Unit No. 3 Unit No. 1 -24M Only Expansion Tank System Controller Unit No. 2 Circ. Pump 2 (if necessary) (Size for the maximum flow rates of the units) Cold Water Supply Pipe Gas pipe Circulation Pump 1 Remote Controller Set dipswitch 3 to “OFF”. See page 17. When installing 2 pumps in parallel Disconnect “Recirculation” connector. See page 3. System Select Connectors * Size the pump to provide at least 8L/min.
Unit No. 12 Unit No. 11 -6- Unit No. 2 Storage tank return line (Size for max. flow. Copper or Stainless Pipe) Storage tank supply line (Size for max. flow. Copper or Stainless Pipe) Unit No. 3 Unit No. 1 Gas pipe Option 1- Tank Thermostat Control Remote Controller Set dipswitch 3 to “OFF”. See page 17. Cold Water Supply Size the water supply piping to allow for max. flow rates of the building.
2. Installation Securing to the wall Be sure to do Item • The weight of the device will be applied to the wall. If the strength of the wall is not sufficient, reinforcement must be done to prevent the transfer of vibration. • Do not drop or apply unnecessary force to the device when installing. Internal parts may be damaged and may become highly dangerous. • Install the unit on a vertical wall and ensure that it is level.
3. Gas Piping Follow the instructions from the gas supplier. Gas Connection • Gas flex lines are not recommended unless they are sized for the maximum input kW (Btu/h • MJ) of each unit. • Do not use piping with a diameter smaller than the size of the gas inlet to each unit • After installation, check the gas line for any leaks before using. Gas Valve 4. Water Piping Ask a qualified plumber to perform the instalation.Observe all applicable codes. Install a gas shutoff valve for every unit installed.
5. Electrical Wiring Do not connect electrical power to the unit until all electrical wiring has been completed. Disconnect Power This appliance must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70. In Canada, the latest CSA C22.1 Electrical Code. Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
6. Unit Wiring Before making wiring connections from each unit to the system controller, make sure that the electrical power has been disconnected. 1. Remove the front cover from the system controller and each unit. System Controller Note: If remote controller RC-7647M or RC-7650M (°C temperature display) is being used, an adjustment to all water heaters connected to the system controller will be necessary. Make this adjustment prior to making the electrical connections to the system controller.
7. Connecting the Remote Controller 1. Pass the remote controller cord through one of the openings in the base of the system controller. Connect the Y terminals to the remote controller terminal block as shown below. 2. Install the remote controller as outlined in the water heater installation manual. If necessary, the remote controller cord can be extended up to 300’ with 18 AWG wire. 3. Only 1 remote controller can be connected to the system controller.
8. Optional Connections Circulation Pump Terminals • Use these terminals to control the pump in any circulating system. Connected this way, the system controller will control the function of the pump. • Use a normally open relay to supply power to the pump. Use a thermal relay if necessary. (1) When operating with 1 circulation pump System Controller Single phase AC120V or Three phase AC240V pump voltage etc.
• Piping diagram for parallel pipe installation Circulation pump Check valve Flow control valve Circulation pump Check value Adjust the pump flow with the flow control valves. If multiple pumps are used, control the flow of each pump with separate valves.
System Controller Exhaust Fan Terminal Warning Light Single phase AC120V Three phase AC240V etc. Relay Thermal Relay Fan Operation Relay Connect to terminals AC Power Supply AC100-240V Under 100W Exhaust Fan (Ventilation Fan) • These terminals will close when any of the units are heating or when the fan on any of the units is blowing. These terminals can be used to control an exhaust fan or damper in this way. • Use a relay to provide power to the fan or damper.
Connecting an External Operation Switch System Controller Operation Switch Connect to terminals Air Pressure Switch 15V 10mA * Using the Noritz remote controller cord, the cord can be extended to 500m (1500ft.) maximum. Relay Power Supply • Follow this procedure to use an external switch to turn power on and off to the unit instead of the remote controller. (1) The power to the units will be on when the external switch is turned on (closed).
9. Trial Operation The installer should test operate the system, explain to the customer how to use the units, and give the owner the Installation and Operation Manual before leaving the installation. (1) Connect electrical power to the system controller and each of the units. (2) Open the gas shutoff valve, the main water valve, and the water shutoff valves on all of the units. (3) Turn the power ON with the remote controller. (The Operation Lamp will light up.
Dipswitch Settings Disconnect the power to the system controlle and each of the units before changing the dipswitches. Otherwise, settings will not take effect. * All dipswitches are set to ON from the factory. SW2: Pump abnormality detection Set to OFF if the pump will not be connected to the system controller, but instead the pump will be controlled by an external control device. SW3: Pump rotation Set to OFF if using 2 pumps.
10. Dimensions 13.2 6.7” 2.8” 7.9” 1.4” 0.4” 3.9” 22.3” 5.5” 23.6” 4x 0.5” 5.5” 4x 0.5” 13.8” 13.1” 3.9” 0.4” 6x 0.2” x 0.4” 1.4” 2.8” 6.7” - 18 - 23.6” 6x 0.2” x 0.
