Wolf CGU-2 / CGU-2K DATA SHEET (Doc. no. 4800589 GB 2018/07)

30m3/h

WOLF
CONVENTIONAL GAS BOILER

COMFORTLINE

CGU2 / CGU2K

THE EXTENSIVE

EQUIPMENT RANGE

from system supplier WOLF oers the ideal solution for commercial and
industrial buildings, new build and modernisation projects alike.
The range of WOLF control units can meet any requirement for heating convenience.
All equipment is easy to operate, highly energy ecient and reliable.
Solar thermal technology can be swiftly integrated into existing
systems.

WOLF equipment is easy and quick to install and maintain.

COMFORTLINE CONVENTIONAL GAS BOILERS CGU-2(K) 04-05

APPLIANCE DESCRIPTION

06

SPECIFICATION 06-07

STANDARD CONTROL UNITS 08

CONTROL ACCESSORIES 09-10

ACCESSORIES 11

03

COMFORTLINE CONVENTIONAL GAS BOILER

atmospheric premix burner for

natural gas E, LL and LPG

WOLF low NOx unit with Hydro Tec system

designed for very low emissions

Control unit with eBUS capability for connection

to WOLF digital control accessories

Electronic ignition and monitoring

Water-cooled,

Modulating controlled output

in heating and DHW mode

Equipped as standard with

modulating high eciency pump (EEI <0,20),

3-way changeover valve and

10Ltr. expansion vessel

High energy efficiency

and compact design

Straightforward installation and operation

Comfortable hot water quick start,

with CGU-2K-18/24 with high quality

stainless steel plate heat exchanger

04

Tested according to the applicable EC directives

BENEFITS OF WOLF

CONVENTIONAL GAS BOILERS
FROM 10 TO 24 KW

CGU-2-10 / CGU-2K-18 / CGU-2K-24

Emissions to NOx class 6

High standard seasonal efficiency [to DIN]

up to 94% (net cv)/ 85% (gross cv) for best possible energy eciency

05

COMFORTLINE CONVENTIONAL GAS BOILER

CGU-2K-18, -24 CONVENTIONAL GAS COMBI BOILER FOR CENTRAL HEATING AND DHW
CGU-2-10 CONVENTIONAL GAS BOILER FOR HEATING (NOT AVAILABLE AS COMBI BOILER)

Conventional, open flue, gas combi boiler for low temperature heating and DHW provision with integral DHW heat exchanger
and electronic flue gas monitoring; tested in accordance with EC directives for connection to a chimney

* Programming unit as accessory

This boiler with natural ventilation is intended for connection exclusively in existing buildings to a flue system that is shared by multiple
apartments and that routes the combustion residues from the installation room to the outside.
Note: Type B1 units are excluded from the eciency requirements of the ErP Directive if used with multiple occupation chimneys.
It draws the combustion air directly from the installation room and is equipped with a draught hood.
This boiler should not be used for any other purpose due to its reduced eciency – this would lead to higher energy consumption and
running costs.

CONVENTIONAL GAS COMBI BOILER
SPECIFICATION

CGU-2(K)

393

216

344

366 (CGU-2K-18)

366 (CGU-2-10)

380 (CGU-2K-24)

694

30

58

14

70

120
200

440

70

855

Heating flow

DHW

Gas connection

50

73

180

Heating return

Cold water

DHW,
cold water

Heating flow,
heating return,
gas connection

06

CONVENTIONAL GAS COMBI BOILER

SPECIFICATION

CGU-2(K)

TYPE CGU-2-10 CGU-2K-18 CGU-2K-24

Energy eciency class, central heating

Energy eciency class, DHW heating -

C C C

A A

Output range kW 7.5-10 8-18 10.9-24

Input range kW 8.3-11.2 8.8-20.2 12.0-26.5

Standard seasonal eciency [to DIN] at 75/60°C (net cv/gross cv)

Width mm

% - 94/85 92/83

440

Height mm 855

Depth mm 393

Flue pipe/wall clearance mm 226

Flue connection Ø mm 110

Connection type for air/flue gas duct Type B

Gas category II

2ELL3P

(DE) / II

Gas connection, external Ø G

11BS

2H3P

(AT) II

2ELL3P

B

11BS

(DE) / II

¾"

(AT) II

2H3P

2ELL3P

B

11BS

(DE) / II

Heating flow, external Ø G ¾"

Heating return, external Ø G ¾"

Cold water connection G ¾"

DHW connection G ¾"

Expansion vessel, nominal capacity litres 10

Expansion vessel pre-charge pressure bar 0.75

Maximum outlet temperature

2)

°C - 55 55

At a draw-o rate of l/min - 2.7-5.8 2.7-7.7

Gas supply details:

Natural gas E/H (net cv = 9.5kWh/m3 = 34.0 MJ/ m3)

Natural gas LL (net cv = 8.1kWh/m3 = 29.2 MJ/ m3)

m/h 1.3 2.1 2.8

m/h 1.5 2.3 3.1

LPG (net cv = 12.9kWh/kg = 46.3 MJ/kg) kg/h 0.8 1.5 2.1

Gas supply pressure:

Natural gas mbar 20 20 20

LPG mbar 50 50 50

Max. overall pressure, heating bar - 3 3

2H3P

(AT)

Required draught for the heat generator Pa 1.5 1.5 1.5

Flue gas temperature

1)

°C 84/101 80/123 80/125

Flue gas mass flow rate g/s 12.8/13.1 12.8/13.9 15.0/19.0

Total weight kg 39 39 41

Integral fuse (medium time lag) A 3.15 3.15 3.15

IP rating IPX4D IPX4D IPX4D

Electrical connection 230V/50Hz 230V/50Hz 230V/50Hz

Power consumption / standby W 83 / 6 83 / 6 83 / 6

CE designation CE-0085BS0516 CE-0085BS0516 CE-0085BS0516

1)

Observe when connecting to a chimney

2)

Relative to a cold water temperature of 10°C

07

COMFORTLINE CONVENTIONAL GAS BOILER

CONVENTIONAL GAS COMBI BOILER

9

1

2

8

3

7

4

6

5

2

8

3

7

4

6

5

°C

0 120

bar

04

2

13

STANDARD CONTROL UNITS

CGU-2(K)

ON/OFF Reset button

Heating water

temperature selector Thermometer

ILLUMINATED RING FOR
STATUS DISPLAY

SETTING

DHW temperature

Pressure gaugeIlluminated ring

selector

Flashing green Standby (power supply on; no heat demand)

Constant green light Heat demand: pump running; burner o

Flashing yellow Emissions test mode

Constant yellow light Burner on; flame steady

Flashing red Fault

DHW TEMPERATURE SELECTOR

Settings 1-9 correspond to a cylinder temperature of 40-65°C. If an external
temperature controller is used, settings made at the DHW temperature selector have
no eect; they are made at the external temperature controller.

HEATING WATER TEMPERATURE SELECTOR

Settings 2-8 correspond to a heating water temperature of 20-75°C. If an external
temperature controller is used, settings made at the heating water temperature
selector have no eect; they are made at the external temperature controller.

WINTER MODE (POSITIONS 2 TO 8)

The circulation pump operates in heating mode.

SUMMER MODE

Switch is set to

circulation pump o (central heating o); only DHW heating, frost
protection and pump anti-seizing (where the circulation pump runs for approx. 30s
every 24hours) are active.

EMISSIONS TEST MODE

Turning the switch to

lets the appliance operate at maximum heating output. The
illuminated ring flashes yellow for 15 minutes or until the maximum flow temperature
has been exceeded.

THERMOMETER/PRESSURE GAUGE

The heating water temperature and the heating system water pressure are displayed.

08

CONVENTIONAL GAS COMBI BOILER

CONTROL ACCESSORIES

CGU-2(K)

Standard control unit part of the standard delivery of the conventional gas boiler

BM programming unit (incl. outside

sensor) as weather-compensated

temperature controller

• Room temperature-dependent/weather-compensated temperature control

• Time programs for central heating and DHW heating

• Backlit LCD screen

• Simple user prompts via plain text display

• Operation by rotary selector with pushbutton function

• 4 function keys for frequently used functions
(heating, DHW, setback, info)

• Installation either inside the heat generator control unit, or as a remote control
in a wall mounting base

• Optional for MM mixer module

• Only one programming unit required for multi circuit systems

• Can be extended with MM mixer module (up to 7 circuits with mixer)

• Fault diagnosis

BM programming unit with wall

mounting base (accessory) as

remote control

2-wire eBus connection

MM MIXER MODULE

• Extension module to control one circuit with mixer

• Weather-compensated flow temperature control

• Easy controller configuration by selecting one of the
preset system versions

• BM programming unit can be attached to the appliance
or fitted to a wall mounting base for use as a remote control

• Rast 5 connection technology

• Incl. flow temperature sensor

ART

• Analogue room temperature controller with
day program for central heating and DHW

• Room temperature-dependent flow temperature

• Display for showing the room temperature,
time and fault messages

• Room temperature-dependent frost protection

AWT

• Analogue weather-compensated temperature
controller with day program for central heating
and DHW

• Weather-compensated flow temperature

• Display for showing the room temperature,
outside temperature, time and fault messages

• Room temperature hook-up

• Frost protection function

• Automatic energy saving appliance

1 ... 7

09

COMFORTLINE CONVENTIONAL GAS BOILER

CONVENTIONAL GAS COMBI BOILER
CONTROL ACCESSORIES

CGU-2(K)

WIRELESS RECEIVER

for external wireless sensor

2-wire eBus connection

EXTERNAL WIRELESS SENSOR

(only in conjunction with receiver for external wireless sensor
and remote control, part no. 27 44 209)

and wireless remote control incl. radio clock (DCF77 signal)

WIRELESS REMOTE CONTROL

(only in conjunction with receiver for external wireless sensor and remote
control). Max. one wireless remote control per circuit with mixer.

WOLF

portal server

DSL router

(LAN / WiFi)

Local (home) network

WiFi

LAN / WiFi

LAN / WiFi

LAN

WOLF LINK PRO

LAN / WLAN interface module for
accessing the control via the Internet
as well as a local network with PC or
smartphone

eBus

Interface module

10

CONVENTIONAL GAS COMBI BOILER

ACCESSORIES

CGU-2(K)

CGU-2 Conventional gas boiler for central heating with option to connect a DHW cylinder

CGU-2K Conventional gas boiler for central heating and DHW heating

Tested in accordance with EC directives and EN297, 483 and 625, and for heating systems according to EN1282 with flow temperatures up to 95°C
and 3bar permissible operating pressure. Suitable for modulating operation down to room temperature; modulating output control. Flue gas monitoring
with CGU-2K. Premix burner equipped and adjusted at the factory for natural gas E and LL. When ordering for LPG a conversion set is enclosed (loose).
CGU-2K for chimney connection for open flue operation.

Control unit with gas burner control unit, electronic ignition and ionisation flame monitor.

White RAL 9016 powder-coated casing.

Accessories

Control accessories

BM programming unit

Wall mounting base

MM mixer module

ART analogue room temperature-dependent controller with day program

AWT analogue weather-compensated controller

Wireless receiver – required for external wireless sensor and wireless remote control

WRS remote maintenance system

Hydraulic accessories and gas supply accessories

Gas ball valve (angle or straight-through version), chrome plated, with or without thermally activated
shut-o device

Drain set, safety valve with hose, hose retainer, trap and pipe collar, transparent plastic

Accessories for flush mounting

Concealed mounting bracket for installation on unfinished walls

CGU-2(K)

Angle maintenance valve G¾", chrome plated

Angle maintenance valve G¾" with connection R½" for safety valve, chrome plated

DHW connector G½", chrome plated

Cold water connector G½", chrome plated

Accessories for surface mounting

Connection set for installation on finished walls

Straight-through maintenance valve Rp¾", chrome plated

Straight-through maintenance valve Rp¾" with connection R½" for safety valve, chrome plated

DHW connector R½", chrome plated

Cold water connector R½" with shut-o valve, chrome plated

Surface mounting bracket for installation on finished walls

Air and flue gas accessories

Aluminium flue pipe Ø 110 mm

Aluminium flue pipe Ø 130mm

11

COMFORTLINE CONVENTIONAL GAS BOILER

Dealer address

WOLF GMBH / P.O. BOX 1380 / D84048 MAINBURG / TEL. [phone]0 / FAX [phone]1600 / www.WOLF.eu

Doc. no. 4800589 GB 2018/07