Hot Water on Demand Installation and Operation Guide Thermo-Pro Thermostatic Series 18kW, 21kW, 24kW, 27kW 118 F º www.atmorusa.
Table of Contents Description Page Safety Guidelines...........................................................................................................................2 Technical Information......................................................................................................................3 Plumbing..................................................................................................................................... 4-5 Mounting......................................
Important Safety Guidelines 1. Safety Guidelines Read this manual thoroughly before attempting to install the instant water heater. Failure to follow the safety instructions in this manual may cause damage to the unit, and could also result in property damage, personal injury, or loss of life. Failure to comply with the safety, installation or operating instructions voids the product warranty.
Technical Information Electrical Specifications Heating elements Watts Kilowatts Voltage Circuit Breaker Amperage Breaker/Relay Total Connection Load Cable Size (minimum) Thermo-Pro Thermo-Pro Thermo-Pro Thermo-Pro 18 kw 21 kw 24 kw 27 kw 3 3 3 3 18,000 21,000 24,000 27,000 18 kW 21 kW 24 kW 27 kW 240 V 240 V 240 V 240 V 3 x 30 A 3 x 40 A 3 x 40 A 3 x 40 A 3 x double-pole 3 x double-pole 3 x double-pole 3 x double-pole 75 A 87.5 A 100 A 112.
Plumbing 01 The plumbing installation must be completed before the electrical installation. 03 05 06 07 02 Residential plumbing systems with unstable pressure or pressure above 5 bar require the application of a pressure reduction valve, set to 4–5 bar. Consult with licensed proffessional. The plumbing installation requires pipes or reinforced flexible hoses that can withstand pressure up to 8 bar and that are rated for high temperature applications.
Mounting 01 The mounting surface must be solid and secure. 03 Use mounting screws that are at least 1 inch in length. Make sure the unit is level prior to securing the mounting screws. 06 07 5 02 04 The unit must be installed in an upright position with the water inlet and outlet at the bottom. 05 Do not install the unit above electrical boxes or junctions. The water heater must be installed in a manner that prevents contact with combustible materials.
Assembly Instructions 01 03 04 06 Remove the appliance covers (Figure 2). 02 Disconnect the cable from the PCB within the unit. (Figure 3) Mount the unit on the wall with 4 screws at the marked points. (Figure 4) Make sure the unit is horizontally level, with water inlets and outlets at the bottom. (Figure 5) Connect the incoming water line to the heater inlet (on right side), and connect the outgoing water line to the heater outlet. Use a hose that can withstand pressure up to 8 bar (Figure 5).
1 Washer 1 104 F º 2 104 F º 2 118 F º 3 118 F º 4 Water Filter 18kw-27kw Note: Neutral (N) does not need to be connected.
Assembly Instructions 08 Reconnect the cable to the PCB within the unit. (Figure 3) 09 Replace the front cover onto the unit and reattach it with 2 screws. (Figure 2) 11 Restore power to the unit by means of the dedicated circuit breakers on the main electrical panel. 12 Do not install the heater where it may be subject to direct sunlight, and freezing temperatures. 13 Install the unit in a location that does not require significant modifications to plumbing and near the main electrical panel.
Electrical Diagram 18kW, 21kW, 24kW, 27kW H3 H2 H1 TRIAC 3 TRIAC 2 TRIAC 1 T1 TERMINAL BLOCK L1 L2 L1 L2 L1 L2 T2 T3 GROUND BAR SNSR1 FLOW SENSOR SNSR2 SNSR3 HEATER CONTROL CTRL1 TEMP SENSOR TEMP SENSOR HEATER DISPLAY T1, T2, T3 = Thermostat H1, H2, H3 = Heating Element SNSR2 = Inlet Temperature Sensor SNSR3 = Outlet Temperature Sensor 9
Starting the system for the first time 01 Turn the temperature knob clockwise to activate the heater to display outlet temperature. 02 With water running through the unit, turn the knob to adjust the temperature. The recommended temperature setting is 118°F (48°C). A 03 The water heater is now ready for operation.
Operation Guide Operating Instructions for the Home Owner This electric water heater is designed to supply hot water for a house or apartment. Unlike a conventional tank storage water heater, this unit is a tankless water heater that does not store hot water. However, once you begin using the system, you will find it operates much like a conventional tank system. Tankless systems deliver hot water instantaneously on demand.
Operation Guide Freezing Temperatures If the ambient temperature falls below 32°F (0°C), protect the heater from potential damage. Shut off power to the unit by means of the dedicated circuit breaker on the main electrical panel. Open a faucet slightly to cause water to flow continuously through the device at a very low rate, without heating. Restore power to the unit when temperature conditions allow. If the water inside the heater freezes, it can cause damage that is not covered by warranty.
Care and Maintenance 01 03 05 13 Press the power switch to the OFF position. Shut off all power to the unit at the circuit breaker on the main electrical panel. Open one or more hot water faucets and allow water to run through the unit for several minutes to purge any air from the heater and water lines. This step must be performed before turning on power to the heater. Failure to perform this step may cause permanent damage to the heating elements.
Troubleshooting Before calling for service, check the troubleshooting list of common issues. If you are unable to resolve a problem, contact your local authorized distributor. PROBLEM ISSUE POSSIBLE CAUSE SOLUTION Water not hot enough. The water flow rate exceeds the heating capacity of the heater. Reduce the water flow rate at the faucet or slightly close the shutoff valve on the unit’s incoming water supply line to reduce the water flow rate. Increase the temperature setting on the unit.
LIMITED WARRANTY The terms of this warranty is solely subject to the original owner and is at no time transferable. A transfer of ownership will result in an immediate termination of this warranty. This warranty is valid only if product is purchased from an authorized reseller.
