Siemens RMH760 User manual

CE1N3131en

03.07.2003

Siemens Building Technologies

HVAC Products

3131

Synco™700

Heating Controllers RMH760

• Heating controller for medium-size and large buildings. The RMH760 is used

as a heating circuit or primary controller. The controller is supplied with 105

preprogrammed heating plants

• Boiler temperature control, control of a second heating circuit and DHW heat-

ing with extension modules

• Menu-driven operation with separate operator unit (plug-in type or detached)

Use

• Office and administrative buildings

• Commercial buildings and shops

• Schools

• Hospitals

• Industrial buildings and workshops

• Apartment blocks and terraced houses

• Heating sections of ventilation and air conditioning plants

• Distribution zones of ventilation and air conditioning plants

• Heating systems with own heat source

• Heating zones of a larger plant

• Basic load heating systems

Buildings

Plants

2/16

Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

Functions

Several of the functions listed require extension modules.

Room operating modes are:

• AUTO: Automatic changeover between 3 setpoints according to the time program

• Comfort: Continuously heating to the Comfort setpoint

• Precomfort: Continuously heating to the Precomfort setpoint

• Economy: Continuously heating to the Economy setpoint

• Protective mode: Heating to the setpoint of Protective mode, if necessary

• Year clock with automatic summer-/wintertime changeover

• 7-day clocks for time program with a maximum of 6 switching points per day

• Holiday and special day program with 16 periods per year

• Selectable room operating mode for the holiday periods

• Selectable DHW operating mode for the holiday periods

• Time program for special days

2 ready configured inputs for:

• Flow temperature (averaging possible)

• Outside temperature

3 freely configurable inputs, optionally for:

• Reception of the following measuring signals:

− Room temperature (averaging possible)

− Return temperature

− Wind speed

− Intensity of solar radiation

• Connection of a remote setpoint adjuster with relative or absolute room setpoint

adjustment

• Connection of an external switch for:

− Operating mode changeover

− Timer function

− Changeover to holiday mode

− Changeover to special day

− Indication of faults

If more than 3 configurable inputs are required, extension modules must be used.

Remote operation with multifunctional room unit via Konnex bus

• Heating circuit controller

− Weather-compensated flow temperature control via the heating circuit mixing

valve, with adjustable setpoints of Comfort, Precomfort, Economy and Protective

mode

− Adjustable influence of room temperature, solar radiation and wind

− Optimized setback and heating up

− Boost heating and quick setback

− Automatic heating limit for demand-dependent control of the heating with adjust-

able heating limits for the Comfort and Economy modes

− Automatic changeover to summer operation (heating off)

− Room model for room functions without room sensor

• Primary controller

Demand-dependent precontrol via the mixing valve in the common flow, based on

the received heat demand signals

• Maximum limitation of the room temperature

• Minimum and maximum limitation of the flow temperature

• Minimum or maximum limitation of the return temperature

Note

Room operating modes

Clock functions

Holiday functions

Ready configured inputs

Freely configurable in-

puts

Note

Remote operation

Control functions

Limitation functions

3/16

Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

• Limitation of the rate of flow temperature increase

• Control of an actuator with 3-position or DC 0…10 V control

• Pump control (system or heating circuit pump)

• Control of maximum 2 twin pumps

• Indication of heat demand

• Configurable relays

• Mixing valve overrun, mixing valve kick

• Pump overrun, pump kick

• Outside temperature-dependent frost protection for the plant

• Frost protection for the building

• Overload supervision

• Fault relay

• Handling of status and error messages

• Outside temperature simulation

• Wiring test

• Storage and reset of parameter sets

• Demand-dependent boiler temperature control

• Boiler pump control

• Control of a 1- or 2-stage or modulating burner; modulating burner with 3-position or

DC 0…10 V control

• Control of a second heating circuit

• Maintained boiler return temperature with own mixing circuit

• Control of an actuator with 3-position or DC 0…10 V control

• Storage tank charging with charging pump, with or without mixing valve control

• Storage tank charging via internal or external heat exchanger

• Time programs for DHW heating and the circulating pump

• Operating modes: AUTO, continuously Normal, continuously Reduced, Protective

mode

• Legionella function

For a more detailed description of all controller functions, refer to Basic Documentation

P3131.

Type summary

Type of unit Type reference Data Sheet

Heating controller (default languages de, fr, it, es) RMH760-1 N3131

Heating controller (default languages de, en, fr, nl) RMH760-2 N3131

Heating controller (default languages sv, fi, no, da) RMH760-3 N3131

Heating controller (default languages pl, cs, sk, hu) RMH760-4 N3131

Operator unit, plug-in type RMZ790 N3111

Operator unit, detached RMZ791 N3112

Servicetool OCI700.1 N5655

Boiler module RMZ781 N3135

Heating circuit module RMZ782 N3135

DHW module RMZ783 N3135

Twin pump module RMZ786 N3145

Switching functions

Supervisory and protec-

tive functions

Service functions

Boiler functions (requir-

ing boiler module

RMZ781)

Second heating circuit

(requiring heating circuit

module RMZ782)

DHW functions

(requiring DHW module

RMZ783)

Note

Heating controller

Operator and service

units

Extension modules

4/16

Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

Universal module with 4 universal inputs and

4 relay outputs RMZ787 N3146

Universal module with 4 universal inputs and

2 analog and 2 relay outputs RMZ788 N3146

Module connector for detached extension modules RMZ780 N3138

Ordering

When ordering, please give type reference according to the above table.

The required operator unit and extension modules must be ordered as separate items.

Room units, sensors, actuator and valve must also be ordered separately.

Equipment combinations

Type of sensor Type of sensing

element, signal

Type reference Data Sheet

Outside sensor LG-Ni 1000 QAC22 N1811

Outside sensor NTC 575 QAC32 N1811

Strap-on temperature sensor LG-Ni 1000 QAD22 N1801

Immersion temperature sensor LG-Ni 1000 QAE2… N1791

Cable temperature sensor LG-Ni 1000 QAP21.3 N1832

Room temperature sensor LG-Ni 1000 QAA24 N1721

Room temperature sensor LG-Ni 1000 QAA64 N1722

Wind effect sensor DC 0…10 V QAV92 N1946

Solar impact sensor DC 0…10 V QLS60 N1943

Type of room unit Type reference Data Sheet

Room temperature sensor with setpoint adjuster QAA25 N1721

Room temperature sensor with setpoint readjuster QAA27 N1721

Room unit with Konnex interface QAW740 N1633

Type of remote setpoint adjuster Type reference Data Sheet

Remote setpoint adjuster, signal 0…1000 ΩBSG21.1 N1991

Remote setpoint readjuster, ±3 K BSG21.5 N1991

All types of electromotoric and electrohydraulic actuators from SBT HVAC Products can

be used:

• Operating on AC 24…230 V

• 3-position control

• DC 0…10 V modulating control

For detailed information about actuators and valves, refer to Data Sheets

N4000…N4999.

Product documentation

Type of document Number

Product Range Description S3110

Basic Documentation P3130

Installation instructions 74 319 0344 0

Operating Instructions (de, en, fr, nl) 74 319 0346 0

Declaration of Conformity (CE) T3110

Environmental Declaration E3110…01

Suitable sensors

Suitable room units

Suitable remote

setpoint adjusters

Suitable actuators

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Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

Technical design

The controller is supplied with 28 basic types of heating plant preprogrammed. They

have been selected to cover the majority of standard applications. Some of them re-

quire extension modules.

When commissioning a plant, the relevant basic plant type must be entered. All associ-

ated functions, terminal assignments, settings and displays will automatically be acti-

vated, and parameters not required will be deactivated.

Precontrol can only be provided by the controller. There are 2 choices:

With mixing valve: With system pump:

P1 P2

3131S01

B7*B7

3131S02

B1*

B1 Flow temperature sensor

B1* Flow temperature sensor

(optional, for display only)

B7 Return temperature sensor (op-

tional, for minimum limitation)

B7* Return temperature sensor (op-

tional, for maximum limitation)

M1 System pump (can be a twin

pump)

Y1 Mixing valve

Measuring input B7 for the return temperature can be configured for either minimum or

maximum limitation.

The control of 1 or 2 heating circuits can be provided either by the controller or the

RMZ782 heating circuit module. The available choices are the same with both types of

unit, provided the required connection terminals for the desired auxiliary function are

present.

Please also note the following:

• If the controller and heating circuit module do not have a sufficient number of config-

urable connection terminals, an additional extension module can be used

• If the controller is used as a primary controller, the RMZ782 heating circuit module

must be used for the control of the heating circuit

• A second heating circuit must be controlled with the RMZ782 heating circuit module

• Measuring input B7 for the return temperature can be configured for either minimum

or maximum limitation

B7*

B91

B92

3131S39

A5 Room unit (optional)

B1 Flow temperature sensor

B5 Room temperature sensor (optional)

B7 Return temperature sensor (optional, for minimum limitation)

B7* Return temperature sensor (optional, for maximum limitation)

B9 Outside sensor

B91 Solar impact sensor (optional)

B92 Wind effect sensor (optional)

M1 Heating circuit pump (can be a twin pump)

R5 Remote setpoint adjuster (optional)

Y1 Mixing valve

Mode of operation

Use of individual de-

vices

Precontrol

Heating circuit control

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Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

Boiler temperature control requires the RMZ781 boiler module. There are three

choices:

Pump in the flow: Boiler pump in the bypass:

G1 G2

3131S03

3131S04

M2 B7

B2 Boiler temperature sensor

B7 Return temperature sensor

(optional, for minimum limitation)

M1 Boiler pump or system pump

(can be a twin pump)

M2 Bypass pump (can be a twin

pump)

In plants with maintained boiler return temperature with own mixing valve, the following

types of modules are required, in addition to the controller:

• Heating circuit module RMZ782; it controls the boiler return temperature via a mixing

valve, depending on the temperature acquired with B1. The module also controls

boiler pump M1

• Boiler module RMZ781; this module controls the boiler temperature depending on

the temperature acquired with B2, and also controls system pump M2

One of the basic types 4–… must be selected on the controller.

3131S41

RMZ782

RMZ781

B1 Boiler return temperature sensor (controlled variable)

B2 Boiler temperature sensor

M1 Boiler pump (can be a twin pump)

M2 System pump (can be a twin pump)

Y1 Mixing valve

Y2 Balancing valve

DHW heating requires the RMZ783 DHW module. There are 5 choices:

DHW1 DHW2

3131S34

B41

3131S35

B41

DHW3 DHW4

3131S36

B41

3131S37

B41

B31 E7

Boiler temperature control

Maintained boiler return

temperature

DHW heating

7/16

Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

DHW5

3131S38

B41

B31 E7

B3 Charging temperature sensor

B31 Primary flow temperature sensor (optional)

B4 Storage tank sensor at the top

B41 Storage tank sensor at the bottom (optional)

E7 Electrical immersion heater (optional)

M3 Charging pump (can be a twin pump)

M4 Circulating pump (optional)

M5 Primary pump (can be a twin pump)

Y5 Mixing valve or 2-port valve

The illustrations contained in this section use the following symbols for precontrol,

boiler temperature control and DHW heating:

Precontrol Boiler temperature control DHW heating

3131S07

RMH760

0-1

RMZ783

3131S05

RMH760

0-2

3131S08

0-3

RMH760

RMZ783

3131S06

RMH760

0-4

RMZ782

0-5

3131S09

RMZ783 RMH760 RMZ782

With all basic types 1–x, primary controller variants P1 and P2 can be selected.

3131S13

RMH760

1-1

RMZ783

RMH760

1-2

RMZ782

3131S11

RMH760

1-3

RMZ782

3131S14

RMZ783 RMH760

1-4

RMZ782

3131S12

RMZ782

Basic types

Note on illustrations

Basic types 0–x

Basic types 1–x

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Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

RMH760

1-5

3131S15

RMZ782

RMZ783 RMZ782

With all basic types 2–x, primary controller variants P1 and P2 can be selected.

RMH760

2-0

3131S42

RMH760

2-1

RMZ783

3131S19

RMH760

2-2

RMZ782

3131S17

3131S20

RMH760

2-3

RMZ782RMZ783 RMH760

2-4

RMZ782 RMZ782

3131S18

RMH760

2-5

RMZ782RMZ782

3131S21

RMZ783

With all basic types 3–x, boiler pump variants G1 and G2 can be selected.

RMZ781

3-0

RMH760

3131S22

RMZ783RMZ781

3-1

RMH760

3131S25

RMZ781

3-2

3131S23

RMH760 RMZ781

3-3

RMH760

3131S26

RMZ783

Basic types 2–x

Basic types 3–x

9/16

Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

3-4

RMH760 RMZ782RMZ781

3131S24

3-5

3131S27

RMH760RMZ781 RMZ783 RMZ782

For minimum limitation of the boiler return temperature, basic types 4–x have their own

mixing circuit.

For minimum limitation of the boiler return temperature, basic types 4–x have their own

mixing circuit

3131S28

RMH760RMZ782

RMZ781

4-0

3131S31

RMH760

RMZ782

4-1

RMZ781

RMZ783

RMH760

RMZ782

4-2

3131S29

RMZ781

RMZ782

RMZ781

4-3

RMH760

3131 S32

RMZ783

3131S30

RMZ782

RMH760

RMZ782

4-4

RMZ781

3131S33

RMZ782

4-5

RMZ781

RMZ782

RMH760

RMZ783

Mechanical design

The controller consists of terminal base and controller insert. It has a plastic housing

with the printed circuit boards, 2 terminal levels and carries the connecting elements

(electrical and mechanical) for an extension module.

The controller can be fitted to a top hat rail conforming to EN 60 715-TH35-7.5, or can

be mounted directly on a wall.

Basic types 4–x

Basic design

10/16

Siemens Building Technologies Data sheet RMH760 CE1N3131en

HVAC Products 03.07.2003

Operation takes place with either a plug-in type or detached operator unit (refer to sec-

tion "Type summary").

3144Z01

123

45 67 8 5 10

1 Connection facility for the service interface (RJ45 socket)

2 Connection facility for the operator unit (with removable cover)

3 LED (green) for indication of operation

4 Fault button with LED (red) for indication of faults and for resetting

5 Openings for plug-in type operator unit RMZ790

6 Button for assignment of the device address

7 LED (red) for indication of the programming process

8 Mounting facility for fitting the controller to a top hat rail

9 Fixing facility for a cable tie

10 Electrical and mechanical connection elements for the extension module

11 Rest for the terminal cover

Engineering notes

• The controller operates on AC 24 V. Operating voltage must conform to the require-

ments of SELV/PELV (safety extra low-voltage)

• The transformers used must be safety isolating transformers featuring double insula-

tion to EN 60 742 or EN 61 558-2-6; they must be suited for 100 % duty

• Fuses, switches, wiring and grounding must be in compliance with local regulations

• Sensor wires should not be run parallel to mains carrying cables powering actuators,

pumps, etc.

• The controller can be used with a maximum of 4 extension modules

• The reference room for control with a room temperature sensor should be the room

that cools down quickest. That room may not be equipped with thermostatic radiator

valves; manual valves must be locked in their fully open position

Mounting and installation notes

• Controllers and extension modules are designed for:

− Mounting in a standard cabinet as per DIN 43 880

− Wall mounting on an existing tophat rail (EN 50 022-35×7.5)

− Wall mounting using two fixing screws

− Flush panel mounting

• Not permitted are wet or damp spaces. The permissible environmental conditions

must be observed

• If the controller shall not be operated inside a control panel, use the detached opera-

tor unit RMZ791 in place of the plug-in type operator unit RMZ790

• Disconnected the system from the power supply prior to mounting and installation

the controller

• The controller insert may not be removed from the terminal base!

• If extension modules are used, they must be attached to the right side of the control-

ler in the correct order. This means in agreement with ascending type reference

Operating, indicating

and connecting ele-

ments

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