Unical GHISS 48R AP, GHISS 24R AP PV, GHISS 32R AP PV, GHISS 40R AP, GHISS 56 R AP User Manual

1. VERSION GB

GHISS 16, 24, 32, 40, 48, 56 R AP

GHISS 16, 24, 32, 40, 48, 56 R AE

GHISS 16, 24, 32, R AP PV

GHISS 16, 24, 32, R AE PV

GHISS 16, 24, 32, 40, B AP

GHISS 16, 24, 32, 40, B AE

GHISS 16, 24, 32, B AP PV

GHISS 16, 24, 32, B AE PV

®

USER’S MANUAL AND
OPERATING INSTRUCTIONS

STANDARD GAS DEVICE WITH
CAST-IRON SEGMENTED HEAT­EXCHANGER, WITH DIRECT
SPARK IGNITION (AE),
AND PIEZO IGNITION (AP)

2 GENERAL 1. VERSION GB

SUITABILITY

GHISS R ..., and GHISS B... boilers have been certified
according to the following European standards:

o 90/396/CEE gas directive
o 92/42/CEE degree of efficiency directive
o 89/336/CEE electromagnetic suitability directive
o 73/23/CEE low voltage directive

DEVICES

Type Ignition Heating

pump

Start-up

container
GHISS ... R AP piezo - ­GHISS ... R AE ionisation - ­GHISS ... R AP PV piezo in place ­GHISS ... R AE PV ionisation in place ­GHISS ... B AP piezo - in place
GHISS ... B AE ionisation - in place
GHISS ... B AP PV piezo in place in place
GHISS ... B AE PV ionisation in place in place

Dear Customer,

Thank you for purchasing the gas boiler of Unical. Thus
you have become the owner of a high technical quality
device operating economically and safely.
Congratulations!

Please check the completeness and intactness of the
product!

Do not remove and do not damage the labels found on
the device!

This document is the operating and maintenance
instructions. The guarantee slip found in the attachment
must be stamped upon purchase and commissioning and
must be filled in legibly!

Please, in your own interest, read the information we
presented on the following pages carefully, and keep it
because you will need it later too.

If you take our advice, our product will serve you reliably
for long years to come.

TABLE OF CONTENTS

GENERAL

Suitability .......................................................................2

Devices ..........................................................................2

Important details to know................................................3

Basic safety rules ...........................................................3

General introduction .......................................................4

Identification...................................................................4

Construction...................................................................4

Technical data................................................................6

Hydraulic operation ........................................................8

Pump .............................................................................9

Electric connection diagrams ........................................10

Operating surface.........................................................12

THE OPERATION OF THE DEVICE

Switching on.................................................................13

Setting the boiler thermostat .........................................17

Temporary shut-down...................................................17

Shutting down for a longer period of time......................17

Cleaning.......................................................................17

Maintenance ................................................................17

THE INSTALLATION OF THE DEVICE

The documentation of the device ..................................18

Sizes and weight ..........................................................18

The boiler room ............................................................20

The connection of the boiler to the existing old heating

system .........................................................................20

Hydraulic connection .................................................... 20

Electric connections .....................................................22

Gas connection ............................................................23

Conducting combustion products.................................. 23

Filling up and draining the system.................................24

SEVICE INSTRUCTIONS

Preparations for start-up ...............................................25

First start-up.................................................................25

Checking during operation............................................27

Shutting down for a longer period of time......................28

Maintenance ................................................................28

Calibration....................................................................29

Switching over to another gas type ...............................30

Cleaning the boiler .......................................................31

The operating instructions contain the following symbols:

Warning = this operation requires greater attention!
Prohibition = this operation must not be carried out!

3 GENERAL 1. VERSION GB

IMPORTANT DETAILS TO KNOW

After you have unwrapped the device, check the

intact and complete status of the product.

Upon planning and execution, the requirements of the

valid gas service provider, the construction,
environmental and related electric standards as well
as the other related standards must be taken into
account and followed to the fullest.

The producer cannot take responsibility for

unprofessional operation and other external
mechanical damage that does not originate from
unprofessional operation.

In the event of an error, if you cannot eliminate the

error on the basis of the instructions of the operating
manual, call the designated brand service.

Check the pressure of the heating system at regular

intervals to prevent its decrease below 1 bar.

If the device switches off interlocking on several

occasions, repeatedly, call the brand service; until
then the following is to be executed:

o Turn off the main switch of the device
o (cutting off electricity).
o Close the connecting gas and water

connection.

o In the case of frost danger, drain the

heating and cold-and-hot-water circles
(draining).

In the interest of the safe and economical operation

of the device, it is practical to have the inspection
recommended by the manufacturer and the
necessary maintenance work executed by the
designated brand service at least once a year.

The present operating instructions contains all the

important information in connection with the use of
the device for the user, therefore, it is practical to
keep it close to the boiler. If the device is sold or
relocated, it should always be accompanied by the
operating instructions so that the new owner and/or
repairman could get sufficient information.

BASIC RULES OF SAFETY

The user is to pay attention to the fact that this device
uses gas, electric energy and water during its operation,
which poses some basic rules of safety:

The boiler must not be used by children or individuals

not trained for its operation.

Do not use electric devices, machines, equipment,
and do not switch on the lights if you can smell gas. In
this case, close the gas tap, air the room and call the
brand service.

Do not touch the boiler with wet hands if you are in
your bare feet.

Do not clean the boiler while it is turned on and is
going.

Safety and other parts can be replaced in the
device only by the authorised brand service, only with
original parts identical with that of the manufacturer.

Do not pull or twist the connecting cable of the boiler
as long as it is live.

The operation of the device requires air supply,
therefore, do not cover or close off or narrow down
the ventilation openings or windows that provide
the replacement of the air required for burning.

For the fear of frost danger, do not install the boiler
in an open room.

Do not store packaging materials in the vicinity of the
boiler (cardboard paper, plastic or wood), or
inflammable or explosive materials.

4 GENERAL 1. VERSION GB

GENERAL INTRODUCTION

GHISS R is the basic type atmospheric furnace-chamber

hot water boiler with cast iron, segmented heat­exchanger. It is suitable for the execution of the pump-
system central heating system of residential and public
buildings and, together with the indirectly heated hot
water containers installed next to them, the execution of
the provision of hot water for use. The “PV” types of the
boiler have built-in circulation pumps, closed expansion
tank, and safety blow-off valves.
GHISS B device is an atmospheric furnace-chamber hot
water gas boiler with a cast-iron, segmented heat­exchanger, built together with a combined-execution,
100-litre, indirectly heated hot water container. It is
suitable for the execution of the pump-system central
heating system of residential and public buildings and the
execution of the provision of hot water for use.
This boiler, in the building and hot water container heating
functions operates with two separate heating pumps,
working in alternate phases.
Its execution, upon demand, can be: PV built together
with circulation pump on building-heating side, automatic
de-airing valve, closed expansion tank, and safety blow­off valve, or the version without those, made for already
existing heating systems.
Its hot water container has an absolutely hygienic water­space provided with double enamel coating and high­output magnesium anode protection. For protection
against over-pressure originating from the expansion of
hot water for use, a safety valve is installed holding back
6 bars.
For the circulation of hot water for use, the device is
equipped with a separate circulation pipe connection.
Both families of devices can be operated with piped
natural gas (“H” or “S”) and tanked PROPANE-BUTANE
gas (II2H,S3B/P).
Type of combustion product conduction: B11BS

IDENTIFICATION

The data sheet serving the identification of the boiler can
be found on the inside wall of the left side housing, after
the removal of the door of the device.

No not remove the data plate and do not damage it!

This data plate contains the main parameters of the
device and the individual identification features (type,
serial number, date of production, etc.).

CONSTRUCTION

The construction and main parts of GHISS R AP and
GHISS R AE type devices are the following:

The construction and main parts of GHISS R AP PV and
GHISS R AE PV type devices are the following:

5 GENERAL 1. VERSION GB

Part list:

1. Boiler housing

2. Deflector

3. Return pipe

4. Circulation pump

5. Burner tray

6. Pressure switch

7. Safety valve

8. Electric control cabinet

9. Automatic de-aerator

10. Cast heat-exchanger

11. Forward pipe

12. Gas pipe

13. Gas valve

14. Ignition controller – only on AE type

15. Ignition electrode

16. Nozzle holding collector

17. Pressure meter

18. Draining tap

19. Expansion tank

20. Filling tap

21. 100-l tank

22. Hot water for use draining tap

The construction and main parts of GHISS B AP and
GHISS B AE type devices are the following:

The construction and main parts of GHISS B AP PV és
GHISS B AE PV type devices are the following:

6 GENERAL 1. VERSION GB

TECHNICAL DATA

UNICAL GHISS R

Unit of

measur

ement

16 AP, -AE

16 AP,-AE,-PV

24 AP, -AE

24 AP,-AE,-PV

32 AP, -AE

32 AP,-AE,-PV

40 AP, -AE 48 AP, -AE 56 AP, -AE

Technical data

Nominal heat load kW 16 24 32 40.5 48.9 57.4
Nominal heat output kW 14 22 29.3 36.8 44.4 52
Nominal degree of efficiency
(water-side)

% 90.5 91 90.9 90.8 90.7 90.6

Distinction of degree of efficiency

**

Min. –max. operating water
temperature

°C 45/85

Water cubic capacity of the boiler dm3 5.5 7 8.6 10.2 11.8 13.4

Number of burners / main nozzles

(v)

Db 2 3 4 5 6 7

Number of cast segments (v+1) Db 3 4 5 6 7 8

Heatable cubic capacity lgm

3

300-350 350-450 450-550 600-700 700-800 800-900
Maximum operating overpressure bar 3 (2nd pressure class)
Boiler body test overpressure bar 6
Pressure loss (80/60 °C) mbar 0.6 0.5 0.4 0.3 0.2 0.1
Expansion tank cubic capacity
(NB)

l 10 10 10 - - -

Expansion tank pre-tensioning
pressure

bar 1 1 1 - - -

Connecting sizes

Forward and return heating water coll 1

Gas connection coll

¾

Gas-technical data Classification according to gas used: II

2H,S3B/P

Piped natural gas
Connecting gas pressure mbar 25
Burner nozzle pressure “H” mbar 12.8 12.5 11.6 12 11.5 11.5
Burner nozzle pressure “S” mbar 14.5 13.5 12.5 13 12.5 13
Burner nozzle diameter “H” Ø/mm 2.35 2.35 2.35 2.35 2.45 2.45
Burner nozzle diameter “S” Ø/mm 2.6 2.6 2.6 2.6 2.6 2.7

Amount of fuel “H” M3/h 1.6 2.5 3.4 4.3 5.2 6.1

Amount of fuel “S” M3/h 2.0 2.9 3.9 5.0 6.0 7.1
Tanked PB-gas
Connecting gas pressure mbar 28-30

Burner nozzle pressure mbar 25.9 25.9 22.0 24.1 24.5 24.0

Burner nozzle diameter Ø/mm 1.45 1.45 1.6 1.6 1.6 1.6
Amount of fuel m3/h 1.1 1.8 2.5 3.1 3.7 4.4

Combustion product data Classification according to the conduct of combustion products: B

11BS

Combustion product conduct Ø 130 130 130 150 180 180
Combustion product temperature °C 100 110 120 130 140 150

Chimney draft demand mbar 0.1
Combustion product mass flow m3/h 38.1 55.8 72.3 87.9 102.7 115
NOx –class

2. (NO

x

– concentration < 200 mg /kWh)

Electric data

Electric connection V/Hz 230/50
Electric output W 14-107 14-107 14-107 14 14 14
Electric protection IP 20
Shock-protection class I.
Pilot light protection Ionisation
Ignition Hz / kV 16/16 electric spark

Noise level

dB max.50

Quality certification

CE CE 1009

Enveloping sizes

Height mm 860
Width mm 410 485 560 635 710 785
Depth mm 610
Boiler volume (without water) kg 92 106 120 134 145 160

7 GENERAL 1. VERSION GB

UNICAL GHISS B

Unit of

measure

ment

16 AP, -AE

16 AP,-AE,-PV

24 AP, -AE

24 AP,-AE,-PV

32 AP, -AE

32 AP,-AE,-PV

40 AP, -AE

Technical data

Nominal heat load kW 16 24 32 40.5

Nominal heat output kW 14 22 29.3 36.8

Nominal degree of efficiency (water-

side)

% 90.5 91 90.9 90.8

Distinction of degree of efficiency

**

Min. –max. operating water temperature °C 45/85

Water cubic capacity of the boiler dm3 5.5 7 8.6 10.2

Number of burners / main nozzles (v) db 2 3 4 5

Number of cast segments (v+1) db 3 4 5 6

Heatable cubic capacity lgm3 300-350 350-450 450-550 600-700

Maximum operating overpressure bar 3 (2nd pressure class)

Boiler body test overpressure bar 6

Pressure loss (80/60 °C) mbar 0.6 0.5 0.4 0.3

Expansion tank cubic capacity (NB) l 10 10 10

Expansion tank pre-tensioning pressure bar 1 1 1

Connecting sizes

Forward and return heating water coll 1

Gas connection coll ¾

Cold-hot water connection coll ½

Data of hot water for use

Nominal heat output kW 27 27 27 27

Container cubic capacity l 100 100 100 100

Maximum operating water temperature °C 60 60 60 60

Permanent water-transport at 45°C

(∆t=30°C)

l 7.5 11 11 12

Container max. operating water

pressure

bar 6 6 6 6

Container test overpressure bar 10 10 10 10

Gas-technical data Classification according to gas used: II2H,S3B/P

Piped natural gas

Connecting gas pressure mbar 25

Burner nozzle pressure “H” mbar 12.8 12.5 11.6 12

Burner nozzle pressure “S” mbar 14.5 13.5 12.5 13

Burner nozzle diameter “H” Ø/mm 2.35 2.35 2.35 2.35

Burner nozzle diameter “S” Ø/mm 2.6 2.6 2.6 2.6

Amount of fuel “H” m3/h 1.6 2.5 3.4 4.3

Amount of fuel “S” m3/h 2.0 2.9 3.9 5.0

Tanked PB-gas
Connecting gas pressure mbar 28-30

Burner nozzle pressure mbar 25.9 25.9 22.0 24.1

Burner nozzle diameter Ø/mm 1.45 1.45 1.6 1.6

Amount of fuel m3/h 1.1 1.8 2.5 3.1

Combustion product data Classification according to the conduct of combustion products: B11BS

Combustion product conduct Ø 130 130 130 150

Combustion product temperature °C 100 110 120 130

Chimney draft demand mbar 0.1

Combustion product mass flow m3/h 38.1 55.8 72.3 87.9

NOx –class 2. (NOx – concentration < 200 mg /kWh)

Electric data

Electric connection V/Hz 230/50

Electric output W 107 / 200 107 / 200 107 / 200 107

Electric protection IP 20

Shock-protection class I.

Pilot light protection Ionisation

Ignition Hz/ kV 16/16 electric spark

Noise level

dB max.50

Quality certification

CE CE 1009

Enveloping sizes

Height mm 1473

Width mm 635 635 635 635

Depth mm 635
Boiler volume (without water) kg 147 160 173 190

8 GENERAL 1. VERSION GB

HYDRAULIC OPERATION

The hydraulic switching of GHISS R AP and GHISS R AE
type devices

The hydraulic switching of GHISS R AP PV and GHISS R
AE PV type devices

Legends:

1. Forward

2. Return

3. Gas

4. Network
water

5. Draining

6. Filling up

7. Hot water
for use

8. Circulation

9. Hot water for use drainage

10. Boiler thermostat

11. Restricting thermostat

12. Thermometer

The hydraulic switching of GHISS B AP and GHISS B AE
type devices

The hydraulic switching of GHISS B AP PV and
GHISS B AE PV type devices

9 GENERAL 1. VERSION GB

PUMP

The character curve of the heating circulation pump built

into the GHISS .. . .. PV type devices can be seen in the

following illustration.
The pump has III levels; it is always practical to use the
lower level that still provides for the heating system; this
way you can save electric energy.

The pressure-loss of PV-type boilers:

Upon the first start-up of the boiler and after a longer

shut-down, it is practical to check the turnability of the
axle of the pump with the help of a screwdriver.

It is forbidden to operate the pump without water!

The hydraulic loss of the boilers

With the exception of the GHISS .. . .. PV type devices,

there is no heating circulation pump in the device. This is
to be provided for in the heating system. For sizing, use
the following graph.

10 GENERAL 1. VERSION GB

ELECTRIC CONNECTION DIAGRAMS

GHISS .... AP

Legends:

T-NY.K. Winter-summer switch G.SZ. Gas valve
F.K. Indicator lamp switch HMV SZ Pump of hot water for use
K.SZ.T. Boiler regulating thermostat R Relay
B.T. Limiting safety thermostat B.SZ.T Boiler regulating thermostat
F.B.T. Smoke gas safety thermostat F.T. Fixed thermostat
SZ.T. Room thermostat N Neutral conductor
F.SZ. Heating circulation pump L Phase conductor
L.J. Indicator lamp (flame indicator) PE Protective grounding
1L. Gas magnetic valve switched phase K.H.J Error indication of restrictors
BVE. Boiler control unit

Supplementary unit necessary for
the connection of the indirect
container

In case of connection, the wire
indicated with * is to be removed!

The units are contained by the PV
types!

11 GENERAL 1. VERSION GB

GHISS .... AE

Legends:

T-NY.K. Winter-summer switch GY.V. Ignition control
F.K. Indicator lamp switch HMV SZ Pump of hot water for use
K.SZ.T. Boiler regulating thermostat R Relay
B.T. Limiting safety thermostat B.SZ.T Boiler regulating thermostat
F.B.T. Smoke gas safety thermostat F.T. Fixed thermostat
SZ.T. Room thermostat N Neutral conductor
F.SZ. Heating circulation pump L Phase conductor
L.J. Indicator lamp (flame indicator) PE Protective grounding
1L. Gas magnetic valve switched phase K.H.J Error indication of restrictors
BVE. Boiler control unit

Supplementary unit necessary for
the connection of the indirect
container

In case of connection, the wire
indicated with * is to be removed!

The units are contained by the PV
types!

12 GENERAL 1. VERSION GB

OPERATING SURFACE

GHISS R

GHISS B

Legend:

1 – Boiler thermometer
2 – Smoke-gas restricting thermostat
3 – Temperature restricting thermostat
4 – Main switch
5 – Winter/Summer switch
6 – Mode of operation indicator lamp
7 – Error-indicator lamp
8 – Reset button (lighted)
9 – Boiler temperature setting button
10 –Hot water for use temperature setting button

13 THE OPERATION OF THE DEVICE 1. VERSION GB

SWITCHING ON

The very first start-up of the device and its gas-technical
regulation are to be executed by the brand service.

Switching on the device, depending on the type:

1. Semi-automatic mode of operation (AP)

In the case of SIT NOVA 820 type gas valve:

- After the device has been connected to the electric
supply, open the gas tap in front of the boiler.

- Turn on the main power supply switch of the boiler.

- Set the boiler regulating thermostat at the minimum,
then take off the door of the device.

- By slightly pushing in the control button of the
combined gas valve, turn it in such a way that the „* ”
marking is in line with the marking pressed into the
metal part of the valve (pilot light).

- By pushing in the button as far as it goes, light the
gas flowing out of the pilot light burner – by pressing
the piezo ignition 2-3 times – then release the button
after 15-20 seconds.

- If switching on is unsuccessful, it is to be repeated in
2 minutes (required for the short ventilation of the
combustor).

- After the device has been started up, you can check
the existence of the pilot light through the spy-hole.

- By slightly pushing in the control button of the
combined gas valve, turn it in such a way that the
small flame symbol is in line with the marking
pressed into the metal part of the valve (main
burner), then replace and close the door of the
boiler.

- Set the boiler regulating thermostat at the desired
value.

- Set the room thermostat at the desired value, then
the main burner will go on.

Shutting down the boiler:

- By slightly pushing in the control button of the
combined gas valve, turn it clockwise in such a
manner that the “dot” symbol on the button
(extinction) is in line with the marking on the valve.

- The boiler that has been shut down can be re-started
only after a 1-2 minute wait.

14 THE OPERATION OF THE DEVICE 1. VERSION GB

2. Automatic mode of operation (AE)

Upon the application of a SIT 840 type gas valve – there
is no need to operate the gas valve manually as – simply
by setting the control devices placed on the front sheet
of the boiler at the desired values – the device operates
automatically according to the following.

- If there is an external mains main switch installed
where the device is set up, turn it on.

- Open the gas tap and the water-side closing fixtures.

- Turn on the main switch of the electric control of the
device (4),

- Set the boiler regulating thermostat (9) according to
the desired temperature.

- Set the mode of operation switch (5) according to the
desired mode of operation and turn it on:

Winter mode of operation – heating and the production
of hot water for use at the indirect container connected to
the boiler, and on GHISS B devices (I).

Summer mode of operation – the production of hot
water for use with the indirect container connected to the
boiler, and on GHISS B devices (0).

The following processes will take place automatically:
the electronics provides the spark, the burner goes on,
and the gas boiler starts heating up according to the
temperature set.
On the GHISS B type we can set the desired
temperature of hot water for use with the hot water for
use regulator (10).

15 THE OPERATION OF THE DEVICE 1. VERSION GB

Following a longer period of being shut down, it may
happen that the device does not start up. In this case,
the following is to be checked and done:

o Check that the taps of the gas, water and

heating system are open.

o Check whether the heating system is sufficiently

filled up: the pressure has to be at least 1 bar.

o Turn off and then turn on again the exterior

separator switch of the boiler.

o Check the setting of the room thermostat, and

carry out on it a switching on and a switching off.

o Check the setting of the boiler temperature

regulator, and set it at the desired temperature.

o Put the winter/summer switch into winter position

(I).

In case of the GHISS B type, in the summer

setting, the boiler only produces hot water for use;
same as in case of GHISS R type if the indirect
container and the necessary electronic unit are
connected. In other cases the device does not
operate in the summer setting.

16 THE OPERATION OF THE DEVICE 1. VERSION GB

o Turn on the main switch of the boiler (the light

has to go on).

o The operation of the boiler is started and

continues until the temperature of the boiler
water reaches the temperature set or the room
thermostat goes off.

o In the event of an ignition error, the illuminated

reset button is lit in red. (AE)

o The procedure of re-starting is the following:

- press the reset button,

- wait until the ignition procedure is
repeated and operation starts.

If the start-up procedure is unsuccessful again, re­starting can be repeated after 1-2 minutes. The number
of repeated re-starts can be maximum 3. After this, call
the brand service.

17 THE OPERATION OF THE DEVICE 1. VERSION GB

SETTING THE BOILER THERMOSTAT

When the outside temperature changes, the heating
temperature is to be adjusted as well. The colder the
outside temperature is, the hotter heating water we
need.
To increase the temperature of the heating water, the
regulating button is to be turned clockwise; when we turn
the button anti-clockwise, the temperature of the boiler
will decrease. In order to avoid condensation, we should
set the forward temperature in such a manner that
provides a temperature of the returning water above
40°C.

TEMPORARY SHUT-DOWN

If for holiday, excursion or some other reason you want
to turn off the boiler, and the outside temperatures are
above zero, you have to do the following:

o Turn off the main switch of the boiler, the green

light goes out.

o Turn off the external separator switch of the

boiler.

If the exterior temperatures are below zero, we
have to follow a different procedure. In this
case do the following:

o Set the boiler thermostat at minimum.
o Set the room thermostat at 10°C.

SHUTTING DOWN FOR A LONGER PERIOD

OF TIME

In this case the following is to be done:

o Turn off the main switch of the boiler, the green

light goes off.

o Turn off the external separation switch of the

boiler.

o Turn off the gas tap.

If there is a danger of freezing, drain the heating
water and the water from the hot water for use
system.

CLEANING

The outer housing of the boiler can be cleaned with a
soft cloth dampened with detergent. In the case of
persistently soiling spots, removal can be executed with
the help of a cloth dampened with a mixture of 50%
industrial alcohol and water.

The cleaning of the boiler body and the smoke

ducts is to be carried out by the brand service, at
regular intervals.

Do not use rough scrubbing agents!

Before you start cleaning the boiler, turn off the
main switch of the boiler and the external separator
switch.

MAINTENANCE

The regular maintenance and check-up of the gas device
is determined by EU decrees and standards. A brand
service with skills and expertise according to the make
provides the following for your device:

o greater security;
o abiding by the legal requirements;
o decreasing the likelihood of errors.

18 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

THE DOCUMENTATION OF THE PRODUCT

The operating instructions belonging to the product are placed in a nylon
bag, on top of the device, within the packaging.

You can find the documentation after you have unpacked the

device; read it carefully and abide by the advice and instructions
described.

The external deflector belonging to the GHISS R 48 and 56

devices are attached in a separate box.

SIZES AND WEIGHT

GHISS 16, -24, -32, -40 R ..

GHISS 48, -56 R ..

Type
GHISS 16 R ..
GHISS 16 R ..PV

GHISS 24 R ..
GHISS 24 R ..PV

GHISS 32 R ..
GHISS 32 R ..PV

GHISS 40 R .. GHISS 48 R .. GHISS 56 R ..

A

410 485 560 635 710

785

Mm

B

195 232.5 270 307.5 345

382.5

Mm

C

130 130 130 150 180

180

Mm

D

30 30 30 50 197

197

Mm

Weight

92 106 120 134 145

160

Kg

19 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

GHISS B AP, GHISS B AE, GHISS B AP PV, GHISS B AE PV

Type
GHISS 16 B ..
GHISS 16 B ..PV

GHISS 24 B ..
GHISS 24 B ..PV

GHISS 32 B ..
GHISS 32 B ..PV

GHISS 40 B ..

A 635 635 635 635 mm
B 317.5 317.5 317.5 317.5 mm
C 130 130 130 150 mm
D 105 105 105 125 mm
Weight 147 160 173 190 kg

20 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

THE BOILER ROOM

UNICAL GHISS boilers are allowed to be installed only in rooms where the replacement of the amount of air necessary for
the device according to the standards (ventilation) is secured, and which satisfy the fire-protection and other requirements.

There is no frost-protection function in these boilers, therefore, they can be installed only in rooms where there is no

danger of freezing!

THE CONNECTION OF THE BOILER TO THE EXISTING OLD HEATING SYSTEM

If we connect the boiler to the old heating system, the following instructions must be abided by:
o The diameter and height of the chimney should satisfy the new requirements, should be of the necessary cleanness

and should provide the appropriate amount of draught.

o The electric system should meet the regulatory requirements of

the boiler.

o The pipes and fixtures of natural gas or tanked gas should

provide the amount and pressure of the fuel specified for the
boiler, according to the standards.

o The closed expansion tank of the system should be of the

necessary size and pre-tensioning pressure so it can
compensate the changes in pressure of the system due to the
change in temperature.

o The output of the heating circulation pump, as well as the place

and direction of installation should satisfy the new
requirements.

o The hydraulic system should be free of air and sediment. This can be achieved through the thorough cleaning of the

system prior to connection. A better result can be achieved with chemical washing.

o The requirements with respect to the chemical composition of the water of the system can be found in the table.

HYDRAULIC CONNECTION

The place of the connection of the heating system and water system for use to the boilers is illustrated by the following
graphs.

GHISS R AP, GHISS R AE GHISS R AP PV, GHISS R AE PV

Water-quality values

PH
Electric conductibility < 200 mV/cm (25°C)
Chloride ion < 50 ppm
Sulphuric acid ion < 50 ppm
Complete iron contents < 0,3 ppm
Alkaline metals < 50 ppm
Water hardness 35°F
Sulphur ion None
Ammonia ion None
Silicon ion < 50 ppm

21 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

GHISS R 16

GHISS R16..PV

GHISS R 24

GHISS R24..PV

GHISS R 32

GHISS R32..PV

GHISS R 40 GHISS R 48 GHISS R 56

1 – forward 1” Ø
2 – return 1” Ø
3 – gas ¾” Ø
4 – cold water
for use

½”

Ø

A 410 485 560 635 710

785

mm

GHISS B AP, GHISS B AE GHISS B AP PV, GHISS B AE PV

GHISS B 16

GHISS B16..PV

GHISS B 24

GHISS B24..PV

GHISS B 32

GHISS B32..PV

GHISS B 40

1 – forward 1” Ø
2 – return 1” Ø
3 – gas ¾” Ø
4 – cold water for use ½” Ø
5 – hot water for use ½” Ø
6 – circulation ½” Ø
A 240 315 390 465 mm
B 240 202.5 165 127.5 mm
C 188 150.5 113 75.5 mm
D 155 117.5 80 42.5 mm

The selection of the type best fitting the heating system of the building is the task of the designer.
If need be, the heating system can be filled up with anti-freeze fluid.

22 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

ELECTRIC CONNECTIONS

The devices are equipped with the following electric
connections. Main circuit connection 230 V 50 Hz, room
thermostat connection and – with the exception of the
PV types – heating pump connection. These connections
– which are of serial hook execution and are provided
with the appropriate labels – are located within the
appliance box.

Access can be achieved in the following way:

o Lift off the top of the boiler, which is fixed by

snaps.

o Screw out the screws of the top of the appliance

box; now you have access to the connecting
hooks.

There is 230 V 50 Hz voltage present on the

connectors of the device, therefore, in order to avoid
accidents, before you remove the top of the
appliance box, turn off the external separator switch!

The connection of the room thermostat can be

double-wired or, if it is necessary for the operation of
the thermostat, triple-wired.

23 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

The following rules must be abided by upon the

execution of the electric connections:

1. Connect the mains cable in a polarity-correct way
to the electric mains. The maximum length of this
can be 3 m.

2. The markings upon connection: L – phase
conductor, N – neutral conductor.

3. The recommended cross-section of the connecting
cables is 1.5 mm

2

, and it is to be damage-free hose

conductor.

4. Connection is to be performed according to the
electric switching diagram.

5. The connection of a protective conductor is
obligatory.

Gas and water pipes must not be used for the
protective wire! The boiler and the pipe system
are to be connected with the shock-proofing
system with a standard protective conductor.
The manufacturer undertakes no responsibility
for incorrect execution!

GAS CONNECTION

The device can be connected either to a piped natural
gas or tanked gas (LPG) system.
Before you execute the connection, the following is to be
performed:

o Check what gas type the boiler has been regulated

for and what is at disposal upon connection.

o Check the cleanness of the gas pipe and if

necessary, install a filter in front of the boiler.

The gas connection must ensure gas of the

appropriate quantity and pressure, and the
appropriate operation of the measuring and safety
system must be checked.

After you have connected the device to the gas

system, check whether the seal is intact and
whether the standards have been abided by.

The gas pipe connection size of every GHISS device
type is ¾”.

CONDUCTING COMBUSTION PRODUCTS

Connect the boiler to the chimney according to the valid
standards and requirements.
Connection is to be executed with rigid pipes, providing
for appropriate caulking, also counting on the
condensing water that may be produced. The
mechanical attachment of connecting pipes should be
secured against movement and slipping out.

The boilers are equipped with smoke gas restricting

thermostat, which, in case smoke gas flows back,
close down the operation of the boiler in an
interlocked manner

The use of un-insulated external chimney poses

potential dangers.

The connection of GHISS 16, -24, -32, -40 .. .. type

devices to the chimney.

GHISS 48, -56 .. .. type devices are to be connected to

the chimney with an external deflector.

24 THE INSTALLATION OF THE DEVICE 1. VERZIÓ RU

After the connection of the deflector to the boiler,
connection to the chimney is to be prepared the same
way as with the interior deflector types.

In case of an exterior deflector, the sensor of the smoke
gas restricting thermostat is to be placed in the deflector,
in the manner indicated in the graph. The sensor has to
be put into the bore hole on the internal brace of the
deflector as far as it goes, and must be secured against
slipping out by tightening the eccentric fastener.

The provision of air necessary for the operation of the
boiler is to be secured through the doors and windows
on the walls of the room or with the help of vent-holes!

FILLING UP AND DRAINING THE SYSTEM

With the GHISS R AP and GHISS R AE type devices,
the filling up of the system can be executed through the
filling up – draining tap on the boiler.
With the GHISS R AP PV and GHISS R AE PV types, if
the device has been connected to the water system,
filling up can be performed through the filling up tap
located on the device, or through the filling up – draining
tap.

With the GHISS B type devices, filling up is possible
from the CHW container, by opening the built-in filling up
tap.

Filling up can also be performed with the pipe­connection attached to the return of the heating system.

Before you start filling up, the following is to be executed:

o Turn off the main switch of the boiler.
o Open the filling tap as far as the pressure of the

system reaches 1.5 bar.

o Close the filling tap.
o Turn on the boiler.

Draining:

o Before you start draining, turn off the boiler.
o Open the draining tap.

25 SERVICE INSTRUCTIONS 1. VERSION GB

PREPARATIONS FOR START-UP

Before you turn on the device, take off the door of the
boiler and check the following:

 The heating system and the gas connection taps

are open.

 The type and connection pressure of the gas is

in line with the device.

FIRST START-UP

For the start-up of the device, do the following:

o Turn on the external separator switch.

o Set the room thermostat at the desired

temperature.

o Set the winter-summer switch to winter setting

(I).

In the summer setting, with the GHISS B type, the

boiler performs only the production of hot water for
use, while in the case of the GHISS R type if the
indirect container and the necessary electronic unit
are connected. In other cases, the device does not
work in the summer position.

o Set the boiler regulating thermostat at the

desired temperature.

o Turn on the main switch of the boiler, the green

light must be on.

 While cold, the pressure of the heating system is

above 1 bar, and is to be free of air.

 The pressure of the expansion tank before the

system is filled up should be 0.8 ~ 1 bar.

 The connection of the electric system is

appropriate for the device.

 The connection of the combustion product

conducting pipe is appropriate.

26 SERVICE INSTRUCTIONS 1. VERSION GB

The ignition process of the boiler starts, sparks are
generated automatically, then it operates continuously
until either the boiler or the room thermostat turns off.

In case of an ignition error, the illuminated reset button
lights up in red.

The procedure for re-starting is the following:

- press the reset button,

- wait for the ignition procedure to repeat,
then operation starts.

It may happen that during continuous operation the
boiler stops and the error indicator lamp lights up.
For re-establishment, do the following:

o Take off the door of the boiler, fastened by

snaps.

o There are two protective hexagon plastic caps at

the bottom of the appliance box. Twist them off
and under each of them is a press-button. The
one on the left is the smoke gas restricting, the
one on the right is the temperature restricting
thermostat.

o

Push in the buttons as far as they go. At the
thermostat that was turned off, a click is heard
when pushed, the error indicator lamp goes out,
and the ignition of the device starts again.

27 SERVICE INSTRUCTIONS 1. VERSION GB

CHECKING DURING OPERATION

After starting up, the following are to be checked:
o The operation of the boiler main switch by

turning it on and off.

o The operation of the boiler thermostat by turning

it off and on.

o The operation of the room thermostat by turning

it off and on.

o The operation of the pump.

o The operation of the external separator by

turning it off and on.

o If everything is operating perfectly, the checking

of the draught of the chimney and heating
technical calibration follows.

28 SERVICE INSTRUCTIONS 1. VERSION GB

SHUTTING DOWN FOR A LONGER PERIOD

OF TIME

In this case, the following is to be done:

o Turn off the main switch of the boiler, the green

light goes out.

o Turn off the external separator switch of the

boiler.

o Turn off the gas tap.

If there is a danger of freezing, drain the water
from the heating and the hot water for use
systems.

MAINTENANCE

Based on the standards and regulations, gas devices
require regular maintenance and periodical check-ups.
This increases the operational safety of the device and –
with the maintenance – we can secure that the device
always operates with the best degree of efficiency, thus
we can achieve the most optimal gas consumption.

Before you start the maintenance:

o Turn off the main separator switch.

o Turn off the gas connection tap.

29 SERVICE INSTRUCTIONS 1. VERSION GB

CALIBRATION

In the factory, the boilers are calibrated for piped natural gas (G20), which is indicated on the boilers with a label! The
volume set can differ from the specified value by ±5%. The calibrated values can be found in the following table. These
are needed because following a possible repair it is necessary to carry out the setting of the device; calibration is also
necessary if the type of gas has to be changed.

The gas technical regulation of the gas device as well as switching over to another type of gas can be carried out

only by the members of the brand service!

The method of switching to another type of gas will be introduced below.

GHISS 16...

GHISS 24... GHISS 32... GHISS 40... GHISS 48... GHISS 56...

G20

G30

G31

G20

G30

G31

G20

G30

G31

G20

G30

G31

G20

G30

G31

G20

G30

G31

„Wobbe index”

[MJ/m3]

45.7 80.9 70.9 45.7 80.9 70.9 45.7 80.9 70.9 45.7 80.9 70.9 45.7 80.9 70.9 45.7 80.9 70.9

Nominal pressure

[mbar]

20 29 37 20 29 37 20 29 37 20 29 37 20 29 37 20 29 37

Minimum pressure

[mbar]

17 17 25.9 17 17 25.9 17 17 37 14 17 29.5 14 17 29.5 14 17 29.5

Number of nozzles

[pcs]

2 3 4 5 6 7

Nozzle size Ø

[mm]

2.35 1.45 1.45 2.35 1.45 1.45 2.35 1.6 1.6 2.35 1.6 1.6 2.45 1.6 1.6 2.45 1.6 1.6

Nozzle pressure

[mbar]

12.8 21.4 25.9 12.5 21.4 27 11.6 16.5 22 12.0 17.2 24.1 11.5 19.5 24.5 11.5 18.6 24

Gas consumption

[m3/h]

1.6 0.49 0.65 2.54 0.74 0.98 3.33 0.97 1.28 4.28 1.25 1.65 5.13 1.5 1.98 6.13 1.8 2.37

The data in the table are provided at 15°C and 1013 mbar air
pressure.

Nozzle pressure can be checked at two places. One is Stud
“A” the on the gas valve control stud, the other is at the control
stud at the end of the nozzle holder collector. Checking
connection pressure is possible at Stud “B”.

o Connect the pressure gauge onto the measuring stub.
o Start the boiler in the manner described above.

Setting nozzle pressure

o Remove closing bolt number 1 of the gas valve.
o Set the value of pressure at the value indicated in the

table with bolt number 2 (the bolt under the closing
bolt). By turning the bolt to the right, pressure
increases, by turning it into the opposite direction, it
decreases.

o With bolt number 3, on AP type devices, the size of the

pilot light can be regulated.

o Remove the measuring device and put back the

closing bolts.

30 SERVICE INSTRUCTIONS 1. VERSION GB

SWITCHING OVER TO ANYOTHER TYPE OF
GAS

During the course of their production, the boilers are
produced and calibrated for G20 type natural gas.
Switching the devices to another type of gas and
carrying out its gas technical calibration can only be
carried out by the brand service!
Switching over to another type of gas – e.g. G30
(propane) – involves the following:

Replacing the nozzles

o Take off the door of the boiler
o Screw the nozzles out of the collector and in

their place screw in the nozzles of the right size
for the gas type. Use the washers!

Gas technical calibration

o Connect the pressure gauge on the measuring

stub (A).

o Start the boiler in the manner introduced earlier.
o Remove closing valve number 1 of the gas

valve.

o With the help of bolt number 2, set the pressure

value to the value specified in the table (the bolt
under the closing bolt). By turning the bolt to the
right, pressure increases, by turning it into the
opposite direction, it decreases.

o Remove the measuring device and put back the

closing bolts.

When switching the gas device to another gas type, the
size of the nozzle and the value of the gas pressure are
to be the same as the values specified in the table
introduced above!

o Before and during calibration, check the

pressure of the tanked gas system.

o Check the density of the complete pipe system.

o Remove the label “Calibrated for G20” stuck

under the gas connection, and instead post a
label referring to the current gas type.

31 SERVICE INSTRUCTIONS 1. VERSION GB

CLEANING THE BOILER

The outer housing of the boiler can be cleaned with a
soft cloth dampened with detergent. In the case of
persistently soiling spots, removal can be executed with
the help of a cloth dampened with a mixture of 50%
industrial alcohol and water.

It is forbidden to use paints and other thinners with an
aggressive effect!

o You will have access to the internal parts by

removing the door and the top sheet.

o If the appliance box is to be removed, it can be

pulled out after the release of the snaps marked
“A”, in “B” direction.

o For the removal of the gas burner, flare nut

number 1 must be loosened, then, after screws
number 2 of the burner tray have been screwed
out, it can be removed forward.

o The burner tubes removed can be cleaned, and

the inside surface of the cast heat exchanger
becomes accessible.

o Check the cleanness of the surfaces of the heat

exchanger, and clean it if soot settlement is
visible. If the layer of soil is too thick, you can
use commercially available soot-removing
chemicals.

o Assembly, logically, is the reverse of the steps of

disassembly.

The cleaning of GHISS B type boilers

Attention! Upon any maintenance operation, disconnect
the device from the electric network!

Among appropriate circumstances of use, the boiler
does not need any special attention apart from the
compulsory annual maintenance operation (before the
heating season).

The internal cleaning of the indirect boilers is usually
necessary when, after a longer period of operating time
or right after the maintenance of the water network for
use, more significant sediment settles in the inside of the
container. Due to its sand-like nature, this sediment can
be usually easily removed from the boiler in the following
manner:

32 SERVICE INSTRUCTIONS 1. VERSION GB

Drain the water contents of the boiler through the
draining tap (4).

 After the removal of the bolts fastening the top,

remove the closing lid of the cleaning hole (5).

 Check the condition of the anode rod and the

washer ring, if need be, replace (9).

 Check the condition of the boiler filling up pipe

manually, clean it mechanically during the
course of self-feed rinsing (3).

 Remove the sediment with the help of the water

jet applied through the cleaning hole, through
the draining tap of the boiler.

After cleaning, mount the fittings in reverse order onto
the structure of the boiler.

33 SERVICE INSTRUCTIONS 1. VERSION GB