3
Product description
Installation and operating instructions
12
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
Fig. 3-5
Design and components of – illustration for GCU com-
pact 515 / 520 / 524 / 528 (Biv)
(for legend designations, see
Item
Name
1
Cold water connection (1" AG)
(1)
2
Hot water connection (1" AG)
(1)
3
Storage tank - inflow (1" AG)
4
Storage tank - return flow (1" AG)
5
Heating - inflow (1" AG)
(2)
(1)
6
Heating - return flow (1" AG)
(2)
7
Solar - inflow (1" IG)
8
Draining connection or
Solar - return flow
9
Flue gas
10
Supply air
11
Sensor pocket for tank temperature sensor t
DHW
12
Upper filling and overflow connection
14
Condensate drain
15
Heat exchanger (boiler body)
16
Heat exchanger (stainless steel) for domestic hot wa-
ter heating
17
Heat exchanger (stainless steel) for storage tank
charging or heating support
18
Heat exchanger (stainless steel) for bivalent storage
charging
(3)
19
Bivalent storage charging - inflow
(1),
(3)
(1" IG)
20
Bivalent storage charging - return flow
(1),
(3)
(1"
IG)
21
Solar - inflow layering pipe
22
Heating circulation pump
23
Burner fan
24
Safety-pressure relief valve (heating circuit)
25
Vent valve (manual)
26
Gas connection (G ½" IG) with connected gas hose
27
Boiler control panel with controller RoCon BF
28
Heat insulation
29
Panelling of the heat cell
30
Protective cover
31
Holding burls for protective cover
32
Type plate
33
Settings type plate
34
Threaded insert for carrying handle
35
Combined filling and draining valve (heating circuit)
36
Automatic vent valve
37
Fill level indicator for storage tank water
39
Ball valve (heating circuit)
40
MAG connection
41
Optional: R3 control and pump unit
3UV DHW 3-way valve (distribution valve, hot water/heating/
heating support)
3UVB1
3-way mixer valve
t
DHW
Storage tank temperature sensor
t
R
Return flow temperature sensor (boiler circuit)
(1)
Recommended accessories: SKB circulation stop valves (2 pcs. each)
(2)
Ball cock (1" IG) is supplied.
(3)
Only valid for types with Biv configuration
Summary of Contents for GCU compact Series
Page 2: ......
