Foreword
This installation and user manual applies to the EM10 modulating boiler controller. The EM10 was developed and manufactured considering the latest technological developments and safety instructions, complying with relevant USA/Canadian standards (UR). This ensures years of trouble-free operation. Special attention was paid to ease of use.
Important General Instructions for Use
To ensure safe, efficient, and environmentally compliant use of the EM10 boiler controller, observe the specifications in this manual. All installation and repair work must be performed by an approved installer. Use the device only with accessories specified in these instructions. Other accessories may only be used if explicitly intended for the application and do not negatively affect system performance or safety.
⚠️ Subject to technical modifications! Buderus continually strives to improve its products, leading to potential variations in illustrations, text, and technical specifications.
Compliance Mark: UL certification mark (CULUS).
Website: http://www.buderus.net
Range of Application and Function
Range of Application
The EM10 module requires boilers equipped with a UBA 3 control unit.
Function of the EM10
- The EM10 module controls the boiler using a 10 VDC signal (e.g., from a building management system), allowing control of supply water temperature or boiler output power.
- It signals blocking malfunctions in the boiler but does not report system faults or service announcements.
- The EM10 does not react to malfunctions of external controllers.
Control Signals
0-10V External Control Signal
The EM10 acts as an interface between the boiler and a building management system, accepting a 0-10 VDC signal for system supply temperature-based control or power-based control.
System Supply Temperature-Based Control
The EM10 translates the 0-10V signal into a flow temperature set point using a linear ratio.
| Input Voltage [V] | Flow Temperature Set Point (boiler) [°C] | Boiler Condition |
|---|---|---|
| 0 V | 0 | off |
| 0.5 V | 0 | off |
| 0.6 V | ± 15°C | on |
| 5.0 V | ± 50°C | on |
| 10.0 V | ± 90°C | on / maximum |
Diagram Description: Figure 1 shows a line graph titled "0 - 10V Diagram". The x-axis represents "external control voltage" (0-10V), and the y-axis represents "flow temperature [°C]". It illustrates the linear relationship between the input voltage and the resulting flow temperature set point.
Control Based on Boiler Output
To activate power regulation, the EM10 connectors must be bridged (see "EM 10 connection diagram" on page 8, pins 1 and 3).
The EM10 translates the building management system signal into a power set point using a linear ratio.
| Input Voltage [V] | Power Set Point (boiler) [%] | Boiler Condition |
|---|---|---|
| 0 V | 0 | off |
| 0.5 V | 0 | off |
| 0.6 V | ± 6 | low load *) |
| 5.0 V | ± 50 | partial load |
| 10.0 V | ± 100 | full load |
Note on Low Load: The low-load power depends on the appliance type. For example, if the appliance's low load is 20% and the control signal is 1 volt (10%), the target power may be lower than the appliance's minimum. In such cases, the appliance might operate using an on/off cycle at low load, delivering 10%. The boiler assembly may start heating continuously from a 2-volt set point.
Diagram Description: Figure 2, titled "Control based on power output", is a line graph. The x-axis shows "external control voltage" (0-10V), and the y-axis shows "boiler power output" (0-100%). It illustrates the linear relationship between the input voltage and the boiler's power output.
Malfunction Signal
The EM10 generates malfunction signals in two ways:
a) AS 24V Connection (Figure 1, Position 1)
This is a volt-free connection for low-voltage malfunction signals (up to 24V), evaluable by automated building control systems.
| Connection | No Malfunction | Malfunction |
|---|---|---|
| 1 and 2 | interrupted | closed |
| 2 and 3 | closed | interrupted |
Refer to the "Wiring Diagram" on page 8.
b) AS 115V Connection (Figure 1, Position 2)
This 115V connection can pass an external malfunction signal to a siren or warning light. During a malfunction, 115V is present on connections 2 and 4. The malfunction signal is active when:
- The UBA 3 has a locking fault code.
- The system pressure is too low.
- There has been no communication with the boiler for at least 5 minutes.
Diagram Description: Figure 3 shows the electrical connections for the EM10 module, labeled "Connections". It illustrates terminals for Netz module, AS 115V, AS 24V, and EMS bus, along with input/output labels and a jumper for power-controlled boiler output.
Connecting the Module
⚠️ DANGER! Electrical components may be live.
- Disconnect the boiler from the power supply.
- Remove the outer jacket of the boiler.
- Click the module into place. See Figure 4: Module being clicked into place.
- Connect the mains cable (3-PIN) and the UBA3-Bus cable (2-PIN) to the module. See Figure 5: Connecting mains cable and UBA3-Bus cable to module terminals 1 and 2.
- Place the cover of the module and tighten the screws using a Phillips screwdriver. See Figure 6: Placing module cover and tightening screws.
- Refit the outer casing of the boiler.
- Connect the boiler to the power supply.
LED Reports of the Module EM10
The module has one LED that can light up red or green. It flashes red briefly when mains power is turned on.
| LED Status | Meaning | Action/Notes |
|---|---|---|
| green (permanent) | Everything is connected properly. | |
| green (flashing) | No communication with the boiler for at least 5 minutes. | Reset the boiler. If reset fails, contact your installer. See boiler instructions. |
| red (permanent) | EM10 is defect. | Contact your installer. See boiler instructions. |
Technical Specifications
| Description | Unit | Data |
|---|---|---|
| Dimensions: Casing (l x b x h) | [in] | 8 x 6.4 x 2 (206 x 162 x 52.5 mm) |
| EM10 voltage supply | 115 VAC ±10%, 60 Hz | |
| EM10 power consumption standby / in operation | [VA] | 0.3 / 3 |
| EM10 power consumption (max. incl. external error device) | [VA] | 150 |
| Internal fuse | 1.6 AT, 250V, voltage transformer with a short-circuit protection | |
| Voltage supply for error contact (high voltage) AS(115) | 115 VAC, maximum 150 W, fused, 1.6 AT | |
| Voltage supply for error contact (low voltage) AS(24) | maximum 48 V, 5 A, no fuse | |
| Protection rating | II in accordance with EN60730 | |
| EMC suppression degree | 60730-2-9 | |
| Electrical safety | 60730-1 | |
| Protection class | IP 40 | |
| Max. EMS bus cable length | [ft.] | 30 (100 m) |
| Ambient temperature: Operation | [°F] | 14 – 140 (= -10 to 60 °C) |
| Ambient temperature: Storage | [°F] | 14 – 158 (= -10 to 70 °C) |
| Relative humidity: Operation | [%] | max. 90 (non-condensing) |
| Relative humidity: Storage | [%] | max. 90 (non-condensing) |
| Cable diameter: error contact high voltage AS(115) | AWG | max. 13 |
| Cable diameter: External error contact low voltage AS(24) | AWG | max. 13 |
| Cable diameter: EMS bus | AWG | min. 19 - max. 15 |
| Cable diameter: 0 - 10 Volt input | AWG | min. 19 - max. 15 |
Wiring Diagram
The wiring diagram illustrates the connections for the EM10 module, including mains supply, AS 24V, AS 115V, and EMS bus. It details input and output signals and the jumper configuration for power-controlled boiler output.
Diagram Description: The wiring diagram shows connections for "Netz module" (mains supply), "AS 115V" (alarm output 115V), and "AS 24V" (alarm output low voltage). It also shows "EMS EMS" terminals for the EMS bus. Labels indicate "Input mains supply", "Output mains supply", "Alarm output 115V (lamp, sirene..)", "Alarm output low voltage", "Input EMS bus", "0V Input 0-10V signal", and "Output EMS bus". A jumper is shown for "power controlled boiler output".
