Ferroli GNK1 Series, GNK1 04, GNK1 02, GNK1 03 Installation And Use Instructions Manual

CAST IRON SECTIONAL BOILER

FOR HEATING AND PRODUCTION

DOMESTIC HOT WATER

GNK1

INSTALLATION AND

USE INSTRUCTIONS

2

INDEX

1. Technical informations

2. Dimensions and technical data

3. Packing and shipping details

4. Installation

5. Checking

6. Service

7. Optional

8. Boiler components

3

1. TECHNICAL INFORMATIONS

1.01 Introduction
GNK1 boiler is a new heating generator with high efficiency, for central heating system as well sanitary

hot water production suitable for burners using oil or gas. The boiler body is built by cast iron sections
joined togheter by mean of biconical nipples and tie rods. Sections fins are especially developped to
achieve the best efficiency fuel consumption. The heater is the quick accumulating type made of
vitreous enamelled steel, able to withstand the onset of rust for a very long time. The boiler body
insulation is provided by mineral high density fibers that minimizes the body heat lost.

Legende:

1 Manothermomètre chaudière
2 Thermomètre ballon
3 Aquastat réglage chaudière
4 Aquastat réglage sanitaire

1

2

7

6

5

4

3

5 Interrupteur été/hiver
6 Aquastat de sécurité
7 Emplacement pour horloge (facultatif)

Fig. 1

1.02 Operative principle

Summer/Winter switch on the «WINTER» setting.

When the switch has been set to the «Winter» position, the appliance is able to produce hot water for
sanitary and heating purposes, with priority to the sanitary circuit. The burner will ignite, the plant
circulator will remain at a standstill while that of the heater will allow water to circulate between the
boiler and the heater itself. Once the water in the heater reaches the temperature value preset by the
thermostat of this latter, the heater circulator stops and that of the heating system will start operating.
When the room temperature has reached the value set on the ambient thermostat, the burner and
circulator stop until heat is again required by the heating system or heater.
If the heater becomes cooled during the heating phase following use of sanitary water, the plant
circulator will immediately stop and thet of the heater will start operating until the temperature set on
the thermostat of this latter has been reached.

4

Summer /Winter switch on the «SUMMER» setting

When the switch has been set to this position, the plant will produce hot sanitary water only and the
relative heating circuit will be kept permanently off. The burner and circulator will therefore only
operate to maintain the temperature of the sanitary water whilst this is being used or during long periods
at a standstill.

1.03 Control and securities devices operation

Regulating thermostat, manual resetting

It operates when the boiler temperature, during the heating mode reach for sanitary hot water
production such a level that can use a danger situation. Before resetting this thermostat ask for Qualified
Serviceman to inspect the appliance.

Central thermostat

It allows to control the boiler temperature by mean of its knobs. This thermostat only controls the burner
during the heating phase.

Room thermostat (not supplied)
This device is not supplied, but can be fitted by installer, it is connected in series to the control

thermostat and it manages both the burner and the circulating pump during the heating mode.

Heater regulating thermostat

Regulates the temperature of the sanitary water.
Controls the burner and heater circulator at the same time, after having by-passed the boiler regulating
thermostat and ambient thermostat if installed.
It therefore has priority over the other two thermostats.

Limit thermostat

Acts as a boiler regulating thermostat with fixed setting when hot sanitary water is produced, i.e. when
the boiler thermostat is by-passed by the heater thermostat. This thermostat can therefore meet two
often opposed requirements:

a) boiler temperature regulation during the heating phase;
b) the highest possible temperature in the boiler during the hot sanitary water production phase.

5

2. DIMENSIONS AND TECHNICAL DATA

2.01 Dimensions and technical data (fig. 2 - tables 1)

123 654

7

1370

105

745

Key

1 Thermomanometer boiler
2 Thermometer boiler
3 Timer sochet
4 Boiler thermostat control
5 Boiler thermostat control

6 Switch Summer/Winter
7 Security thermostat
8 Circulating pump boiler
9 Valve automatic

10 Non-return valve

715

Fig. 2

Tabelle

130

a2

1013

422

252

82

a3

a1 Flow 1" 1/2
a2 Return 1"
a3 Boiler drain 1/2"
a4 Hot sanitary water outlet
a5 Recirculation
a6 Cold sanitary water inlet

500

9

a1

8

10

631

a4

a5

a6

551

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