Home
>
American Water Heater
>
Electric Heater
>
American Water Heater HeavyDuty Surface Thermostat Commercial Electric STCE3150 80 119 User Manual
American Water Heater HeavyDuty Surface Thermostat Commercial Electric STCE3150 80 119 User Manual
Have a look at the manual American Water Heater HeavyDuty Surface Thermostat Commercial Electric STCE3150 80 119 User Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 32 American Water Heater manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.

11 by the manufacturer. The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME. If replaced, the new valve must meet the requirements of local c o d e s , b u t n o t l e s s t h a n a c o m b i n a t i o n t e m p e r a t u r e a n d p r e s s u r e relief valve rated/sized and certified as indicated in the above paragraph. The new valve must be marked with a maximum set p r e s s u r e n o t t o e x c e e d t h e m a r k e d h y d r o s t a t i c w o r k i n g p r e s s u r e of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater Btu/hr or K W input rate as shown on the water heater’s model rating plate. For safe operation of the water heater, the temperature and pressure relief valve must not be removed from its designated opening nor plugged. The temperature-pressure relief valve must be installed directly into the fitting of the water heater designed for the relief valve. Install discharge piping so that any discharge will exit only within 6 inches (15.2 cm) above, or external to the structure. Do not pipe the discharge to a crawl s p a c e . B e c e r t a i n t h a t n o c o n t a c t i s m a d e w i t h a n y l i v e e l e c t r i c a l par t . T he disc harge opening must not be blo c ked o r reduc ed in size under any circumstances. Excessive length, over 30 feet (9.14 m), or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve. No valve or other obstruction is to be placed between the relief valve and the tank. Do not connect discharge piping directly to the drain unless a 6” (15.2 cm) air gap is provided. To prevent bodily injury, hazard to life, or property damage, the relief valve must be allowed to discharge water in adequate quantities should circumstances demand. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage. The Discharge Pipe: • Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions. • Shall not be plugged or blocked. • Shall not be exposed to freezing temperatures. • Shall be of material listed for hot water distribution. • Shall be installed so as to allow complete drainage of both the Temperature-Pressure Relief Valve and the discharge pipe. • Must terminate a maximum of six inches above a floor drain or external to the building. In cold climates, it is recommended that the discharge pipe be terminated at an adequate drain inside the building. • Shall not have any valve or other obstruction between the relief valve and the drain. The temperature-pressure relief valve must be manually operated at least once a year. Caution should be taken to ensure that (1) no one is in front of or around the outlet of the temperature-pressure relief valve discharge line, and (2) the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot. If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions in this manual, and replace the temperature-pressure relief valve with a properly rated/sized new one. I f y o u d o n o t u n d e r s t a n d t h e s e i n s t r u c t i o n s o r h a v e a n y q u e s t i o n s regarding the temperature-pressure relief valve call the toll free number listed on the back cover of this manual for technical assistance. WATER LINE CONNECTIONS This manual provides detailed piping installation diagrams (see back section of this manual) for typical methods of application. For the heater inlet and outlet connections, dielectric unions are recommended. The water heater may be installed by itself, or with a separate storage tank, on both single and two-temperature systems. When used with a separate storage tank, the circulation may be either by gravity or by means of a circulating pump. When a circulating pump is used it is important to note that the flow rate should be slow so that there will be a minimum of turbulence inside the heater. CLOSED WATER SYSTEMS Water supply systems may, because of code requirements or such conditions as high line pressure, among others, have installed devices such as pressure reducing valves, check valves, and back flow preventers. Devices such as these cause the water system to be a closed system. THERMAL EXPANSION As water is heated, it expands (thermal expansion). In a closed system the volume of water will grow when it is heated. As the volume of water grows there will be a corresponding increase in water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty. Thermal expansion can also cause intermittent temperature- pressure relief valve operation: water discharged from the valve due to excessive pressure build up. This condition is not covered under the limited warranty. The temperature-pressure relief valve is not intended for the constant relief of thermal expansion. A properly sized thermal expansion tank must be installed on all closed systems to control the harmful effects of thermal expansion. Contact a local plumbing service agency to have a thermal expansion tank installed.

12 ELECTRICAL GENERAL The installation must conform with these instructions and the local code authority having jurisdiction and the requirements of the power company. In the absence of local codes, the installation must comply with the current editions of the National Electrical Code, NFPA 70 or the Canadian Electrical Code CSA C22.1. An electrical ground is required to reduce risk of electrical shock or possible electrocution. The water heater should be connected to a separate grounded branch circuit with over-current protection and disconnect switch. The water heater should be grounded in accordance with national and local codes. Voltage applied to the heater should not vary more than +5% to -10% of the model and rating plate marking for satisfactory operation. Allowable Ampacities of Insulated ConductorsNot more than three conductors in raceway, cable, or earth (directly buried), based on ambient temperature of 30°C (86°F) +The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG. 20 amperes for 12 AWG. and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum. *For dry locations only. See 75°C column for wet locations. Table 3.

13 AMPERAGE TABLE/OVERCURRENT PROTECTION The tables above provides the total connected heating element load in amperes for branch circuit conductor and overcurrent protection sizing. Single-phase heaters are two wire circuits. Three-phase heaters are three wire circuits. In addition to the foregoing, a grounded conductor is required. The rating of the overcurrent protection must be computed on the basis of 125% of the total connected load amperage. Where the standard ratings and settings do not correspond with this computation, the next higher standard rating or setting should be selected. HEATER CIRCUITS - ELECTRONIC CONTROL MODELS The water heater’s electrical components are pictured and identified in Figure 2 and Figure 3 The model and rating plate illustration on page 4 identifies heater circuit ratings. The ELECTRONIC CONTROL model has two electrical circuits: • The control circuit, which controls the electrical power to heating elements, referring the following control circuit diagram Figure 6 • The power circuit, which is operated by the control circuit carries the electrical load of the heating elements. The following describes the heater circuits and includes wiring diagrams for Delta configuration, refer to the “WYE Configuration Insert” for water heaters operating at 380V/400V/416V/575V. All heater circuits are designed for 50/60 cycle alternating current. CONTROL CIRCUIT - ELECTRONIC CONTROL MODELS These models are equipped with an electronic control system. The system includes a CCB (Central Control Board), an immersion temperature probe with ECO for temperature sensing and limiting, a UIM (User Interface Module) for user interface & information display and element current sensors for monitoring the power circuits. Refer to the control circuit label on the water heater for details. The CCB is powered by a small 120V/24V transformer. The control circuit operates on 120V supplied by a larger 100VA transformer. Standard equipment includes control circuit fusing using two, 3 amp, class G fuses with 600 volt rating. Do not substitute fuses of a different rating. Sequence of Operation 1. When the control is powered, the UIM should display model information, water temperature, Operating Set Point, heating status and operating mode. 2. If the control determines that the actual water temperature inside the tank is below the programmed Operating Setpoint minus the (1st) differential, a call for heat is activated. 3. After all safety checks are verified, the CCB will energize contactor coils starting with the lower bank of heating elements (each diagonal row of three heating elements is considered a “bank” - see Figure 2) then energize the middle bank (if so equipped) and top bank (if so equipped). The middle and top banks (if so equipped) are energized according to programmed 2nd and 3rd differential set points. 4. The control remains in the heating mode until the water temperature reaches the programmed Operating Setpoint. At this point the contactors will be de-energized in the reverse order. 5. The control system now enters the standby operating mode while continuing to monitor the water temperature and the state of other system devices. If the water temperature drops below the programmed Operating Setpoint minus the (1st) differential, the control will automatically return to step 2 and repeat the heating cycle. NOTE: See the Electronic Control Models Operation section for more detailed information on temperature settings mentioned above. 120 VAC CONTROL CIRCUIT TRANSFORMER CONNECTIONS - ELECTRONIC CONTROL MODELS Table 4. Table 5. Figure 4 Figure 5 KW Input Number Of Elements Element wattage Full Load Current In Amperes Number Of Thermostats Number Of Fuses Single Phase Three Phase 208V 240V 277V480V208V240V480V 6 32000 2925 22131715 8 3 6 9 30004438 3319252211 12 40005850 4425342915 13.5 45006557 4929383317 15 50007363 5532423718 18 6000- - - 75 6538- - - 4422 18 63000 87- - - - - - - - - 50- - - - - - 6 12 24 400011 6100 8750675829 27 450013011 3 9857756533 30 5000145125 10963847337 36 6000- - - 150 13075- - - 8744 36 94000 173- - - - - - - - - 100 - - - - - - 9 18 40.5 4500195169 1478511 3 9849 45 5000217188 16394125 109 55 54 6000- - - 225 19511 3150 130 65

14 CCB (CENTRAL CONTROL BOARD) CONTROL CIRCUIT DIAGRAM - ELECTRONIC CONTROL MODELS Figure 6 WIRING DIAGRAMS

15 DIAGRAM 1. WIRING DIAGRAMS POWER CIRCUIT DIAGRAMS - ELECTRONIC CONTROL MODELS The water heater’s electrical components are pictured and identified on page 7. The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60/50 hertz alternating current. The water heater circuit wiring is 12 AWG, AWM, or TEW type, rated 600 volts, 105°C. Fusing consists of three 30 amp fuses for each contactor. Fusing is an optional feature for Canadian models. THREE ELEMENTS - SINGLE AND THREE PHASE SIX ELEMENTS - SINGLE AND THREE PHASE

16 WIRING DIAGRAMS NINE ELEMENT - SINGLE AND THREE PHASE CONVERSION TO SINGLE PHASE When the heater is shipped for connection to a three-phase electrical service, it may be connected to a single-phase electrical service of the same voltage by: 1. Disconnect blue wires and yellow wires from terminal L3. 2. Reconnect all blue wires to terminal L1 (with black wires). 3. Reconnect all yellow wires to terminal L2 (with red wires). 4. Connect incoming power to terminals L1 and L2. CONVERSION TO THREE PHASE When heater is shipped for connection to a single-phase electrical service, it may be connected to a three-phase electrical service of the same voltage by: 1. Disconnect blue wires from terminal L1. 2. Disconnect yellow wires from terminal L2. 3. Reconnect all blue wires and yellow wires to terminal L3. 4. Connect incoming power to terminals L1, L2, and L3. DIAGRAM 2.

17 WIRING DIAGRAMS POWER CIRCUIT DIAGRAMS - SURFACE MOUNT CONTROL MODELS The water heater’s electrical components are pictured and identified on page 8. The following describes the heater circuits and includes wiring diagrams. All heater circuits are designed for 60/50 hertz alternating current. The water heater circuit wiring is 12 AWG, AWM, or TEW type, rated 600 volts, 105°C. Fusing consists of two 30 amp fuses for each element. Fusing is an optional feature for Canadian models.DIAGRAM 3.

18 WIRING DIAGRAMS CONVERSION TO SINGLE PHASE When the heater is shipped for connection to a three-phase electrical service, it may be connected to a single-phase electrical service of the same voltage by: 1. Disconnect blue wires from terminal L2. 2. Connect all blue wires to terminal L1 (with black wires). 3. Disconnect all red wires from terminal L3. 4. Connect all red wires to terminal L2 (with yellow wires). 5. Connect incoming power to terminals L1 and L2. CONVERSION TO THREE PHASE When heater is shipped for connection to a single-phase electrical service, it may be connected to a three-phase electrical service of the same voltage by: 1. Disconnect blue wires from terminal L1 2. Disconnect red wires from terminal L2. 3. Connect all blue wires to terminal L2 (with yellow wires). 4. Connect red wires to terminal L3. 5. Connect incoming power to terminals L1, L2 and L3. NINE ELEMENTS - SINGLE AND THREE PHASE DIAGRAM 4.

19 OPERATION GENERAL Refer to the Features and Components section of this manual (pages 7 & 8) for the location of components mentioned in the instructions that follow. NEVER turn on power to the water heater without being certain the water heater is filled with water and a temperature and pressure relief valve is installed in the relief valve opening. DO NOT TEST ELECTRICAL SYSTEM BEFORE HEATER IS FILLED WITH WATER. FOLLOW FILLING AND START-UP INSTRUCTIONS IN OPERATION SECTION. FILLING THE WATER HEATER 1. Turn off the electrical disconnect switch. 2. Close the water heater drain valve. 3. Open a nearby hot water faucet to permit the air in the system to escape. 4. Fully open the cold water inlet pipe valve allowing the heater and piping to be filled. 5. Close the hot water faucet as water starts to flow. The heater is now ready for STARTUP and TEMPERATURE REGULATION. INITIAL START UP The following checks should be made by the installer when the heater is placed into operation for the first time. 1. Turn off the electrical disconnect switch. 2. Open the front panel, check all water and electrical connections for tightness. Also check connections on top and side of heater. Repair water leaks and tighten electrical connections as necessary. 3. Depress the red manual reset button on each Thermostat/ECO combination control (Surface Mount Control Models only). 4. Turn on the electrical disconnect switch. 5. Observe the operation of the electrical components during the first heating cycle. Use care as the electrical circuits are energized. 6. Close the front panel. Temperature control and contactor operation should be checked by allowing heater to come up to temperature and shut off automatically. Use care as the electrical circuits are energized. DRAINING THE WATER HEATER It is recommended that the water heater storage tank be drained and flushed every 6 months to reduce sediment buildup. The water heater should be drained if being shut down during freezing temperatures. See Features And Components in this manual for the location of the water heater components described below. Burn harzard. Hot water discharge. Keep hands clear of drain valve discharge. TO DRAIN THE WATER HEATER STORAGE TANK: 1. Turn off the electrical supply to the water heater at the breaker or disconnect switch. 2. Ensure the cold water inlet valve is open. 3. Open a nearby hot water faucet and let the water run until the water is no longer hot. 4. Close the cold water inlet valve to the water heater. 5. Connect a hose to the water heater drain valve and terminate it to an adequate drain. 6. Open the water heater drain valve and allow all the water to drain from the storage tank. 7. Close the water heater drain valve when all water in the storage tank has drained. 8. Close the hot water faucet opened in Step 3. 9. If the water heater is going to be shut down for an extended period, the drain valve should be left open.

20 HIGH TEMPERATURE LIMIT CONTROLS (ECO) Both the ELECTRONIC CONTROL and SURFACE MOUNT CONTROL model water heaters are equipped with one or more ECO (energy cut off) non adjustable high temperature limit control(s). An ECO is a normally closed switch that opens (activates) on a rise in temperature. If the ECO switch contacts open (activate) due to abnormally high water temperatures it will lock-out and disable further heating element operation. It is important that a qualified service agent be contacted to determine the reason for the ECO activation before resetting the ECO. Once the reason has been determined and corrected the ECO(s) can be reset as follows: Surface Mount Control ModelsSurface Mount Control models have multiple surface mounted Thermostat/ECO combination controls. One for each installed heating element - see the Surface Mount Control wiring diagrams in this manual. The ECO high temperature limit switch contacts on each control will open when the tank temperature reaches approximately 200°F/93°C. If activated, the ECO reset button will be slightly extended and stiff to the touch. When the ECO switch contacts open (activate) voltage to ONE heating element ONLY is terminated to prevent further heating operation of that element. Voltage may still be present at other heating elements and they may still be heating the water. The ECO is a manual reset switch. Should one or more ECO activate, the tank temperature must drop below 120°F/49°C before an ECO can be reset. To manually reset an ECO: 1. Disconnect the power supply to the water heater. 2. Allow the tank temperature to cool below 120°F/49°C. 3. Remove the front control cover from the effected control(s). 4. Press the manual reset button on each of the effected controls. 5. Once the control(s) has been reset the control cover should be replaced prior to restoring power to the water heater. Electronic Control ModelsThe ECO high temperature limit switch is located inside the immersion Temperature Probe (two red wires) on ELECTRONIC CONTROL models. The ECO switch contacts will open when the water temperature reaches approximately 202°F/94°C. When the ECO switch contacts open (activate) the electronic control system locks out and displays a Fault message. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation. Should the ECO activate, the water temperature must drop below 140°F/60°C before the control system can be reset. Once the water temperature has cooled below this point the power supply to the water heater must be turned off and on again to reset the control system. THERMOSTAT CONTROLS The water heaters covered in this instruction manual are equipped with adjustable thermostat controls to control water temperature. Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/or death. The temperature at which injury occurs varies with the persons age and duration of exposure. The slower response time of children, the elderly or disabled persons increases the hazards to them. Never allow small children to use a hot water tap or draw their own bath water. Never leave a child or disabled person unattended in a bathtub or shower. The water heater should be located in an area where the general public does not have access to set temperatures. Setting water heater temperatures at 120°F (49°C) will reduce risk of scalds. Some areas require settings at specific lower temperatures. THERMOSTAT SETTINGS - SURFACE MOUNT CONTROL Adjustment of temperature controls on surface mounted controls is to be performed by a qualified service agent at initial start-up. These models have multiple thermostat/ECO combination controls one for each heating element installed. These thermostats are set from the factory at 140°F/60°C. Set the thermostat dial at the lowest setting which produces an acceptable hot water supply. This will always give the most energy efficient operation. The water heater is supplied with thermostats that may come from different manufactures and have different temperature indications as described below. Thermodisc ThermostatsThermodisc thermostats are adjustable from approximately 120°F (49°C) (lowest setting) to 181°F (83°C) (highest setting) see figure 7A. These thermostats are set from the factory at approximately the 140°F (60°C) setting. The over temperature device (ECO high limit) attached to each thermostat has a manual reset. APCOM Thermostats Apcom thermostats have three designated set points; LO, MED and HI. See figure 7B. The approximate equivalent temperatures for these three settings are: LO = 140°F (60°C), MED = 160°F (71°C) and HI = 181°F (83°C). These thermostats are set from the factory at the MED 140°F (60°C) setting. The over temperature device (ECO high limit) attached to each thermostat has a manual reset. APCOM IN C 40A 120-277 VA C 25A.480 VA C 125VA.PT.DTY. 120-480 VAC MEDLO HIMODELWH19HC 30A 120-250 VAC 22A 277 VA C 12.5A 480VAC125 VA.PT.DTY. 120-480 VA C Figure 7A Figure 7B Figure 7 shows the approximate time-to-burn relationship for normal adult skin. Water Temperature °F Time for 1st Degree Burn (Less Severe Burns) Time for Permanent Burns 2nd & 3rd Degree (Most Severe Burns) 11 0 (normal shower temp.) 11 6 (pain threshold) 11 6 35 minutes 45 minutes 122 1 minute 5 minutes 131 5 seconds 25 seconds 140 2 seconds 5 seconds 149 1 second 2 seconds 154 instantaneous 1 second (U.S. Government Memorandum, C.P.S.C., Peter L. Arm- strong, Sept. 15,1978) Table 6. TEMPERATURE REGULATION