Ferroli Pegasus F2 68, Pegasus F2 85, Pegasus F2 102 Installation And Maintenance Instructions Manual

INSTALLATION AND

MAINTENANCE INSTRUCTIONS

Appr. nr. A 9503 A - 0085 AQ 0765

PEGASUS F2

GAS-FIRED CAST-IRON BOILERS

WITH ELECTRONIC IGNITION

AND FLAME RECTIFICATION MONITORING

Models 51 - 68 - 85 - 102

cod. 3540724/2 - 04/98

Pegasus F2

2

Contents

1. General technical data

2. Dimensions and technical data

3. Installation

4. Wiring diagrams

5. Startup and shutdown

6. Gas regulation

7. Conversion

8. Maintenance and cleaning

9. Fault finding

Pegasus F2

3

1. GENERAL TECHNICAL DATA

1.01 Introduction

The Pegasus F2, with CE approval, is designed for use with natural gas (G20) or LPG (G31) for indirect
central heating and hot water.

1.02 Installation requirements

Only CORGI registered installers should fit the Pegasus boilers.
The boiler installation should comply with relevant British Standards Specifications, codes of practice,
and Current Building Regulations, together with any special Regional Requirements of the Local
Authorities, gas supplier and Insurance Companies.

2. DIMENSIONS AND TECHNICAL DATA

2.01 Dimensional data (see fig. 1 and table 2)

A

1000

a1 - Return 1" 1/2
a2 - flow 1" 1/2
a3 - Gas inlet 3/4"

B

900

D

762

672

222

C

a3

a2

E

a1

Fig. 1

Pegasus F2

4

2.02 Technical data

The standard cast-iron PEGASUS F2 boiler is set to operate on natural gas (G20).
The boiler is designed to operate with a flow temperature of 82°C and a maximum ∆t of 20°C.

Pegasus F2 51

Pegasus F2 68

Table 1

Pegasus F2 85

Pegasus F2 102

Pegasus F2 51

Pegasus F2 68

Table 2

Pegasus F2 85

Pegasus F2 102

Pegasus F2 51

Pegasus F2 68

Table 3

Pegasus F2 85

Pegasus F2 102

MODEL

MODEL

MODEL

A

mm

550

640

720

800

No.

OF MAIN

BURNERS

3

4

5

6

NUMBER OF

SECTIONS

4

5

6

7

HEAT

OUTPUT

kW

51

68

85

102

DIMENSIONS CONNECTIONS

B

C

D

E

mm

96,5

96,5

106,5

106,5

PRINCIPALES

INJECTORS

Ø mm

Nat. G20

3,5

3,5

3,5

3,5

Ø mm

180

180

200

200

G.P.L. G31

2,15

2,15

2,15

2,15

mm

43

46

44

42

Nat. G20

mm

35

38

36

34

PILOT

INJECTORS

Ø mm

G.P.L. G31

0,4

0,4

0,4

0,4

RETURN

0,24

0,24

0,24

0,24

a1 Ø

1 1/2"

1 1/2"

1 1/2"

1 1/2"

FLOW

a2 Ø

1 1/2"

1 1/2"

1 1/2"

1 1/2"

GAS SUPPLY

PRESSURE

(mbars)

Nat. G20

15 to 23

15 to 23

15 to 23

15 to 23

HEAT INPUT

(NETT)

kW

56

74,8

93,5

112

GAS
a3 Ø

3/4"

3/4"

3/4"

3/4"

LPG G31

37

37

37

37

WEIGHT

INCLUDING

PACKAGE

CONTENT

Kg.

260

300

350

400

GAS PRESS. AT

BURNER MANIFOLD

(mbars)

LPG G31

Nat. G20

36

13,3

36

13,3

36

13,3

36

13,3

HEAT INPUT

(GROSS)

kW

62,2

83

103,8

124,3

WATER

(liter)

22

26

30

34

GAS FLOW RATE

Nat. G20

m

5,9

7,9

9,9

11,8

MAX

OPERATING

PRESSURE

(bars)

3

/h

4

4

4

4

LPG G31

kg/h

4,34

5,79

7,24

8,68

Pegasus F2

5

2.03 Main components

Front view of the boiler without front casing

14

10

15
11

13

1 2

4

6 3

Fig. 2a

5

816

75

9

12

Key

1. Temperature-pressure gauge

2. Boiler control thermostat

3. Ignition lockout re-set botton

4. Boiler on/off switch

5. Flue gas safety thermostat

6. Limit thermostat reset botton

7. Ignition PCB

8. Electronic panel (not available UK)

6

6

4

2

1

Control panel

Fig. 2b

9. Control panel

10. Gas valve

11. Pilot burner assembly

12. Gas burner manifold

13. Gas pressure test point

14. Automatic air vent

15. Drain cock

16. Flue gas sampling point

Pegasus F2

9

8

7

3

2.04 Characteristic pressure drop curve

Water pressure drop in all models is shown in fig.

3. The following diagram shows the pressure drop
in the boiler as a function of the water flow rate.

∆P mbar

200

100

90
80
70

60
50

40

30

20

4 EL.

5 EL.

6 EL.

7 EL.

Fig. 3

10

12345678910

Flow rate

2.05 Safe discharge of combustion products

The boiler comes with a FLUE GAS SAFETY THERMOSTAT, which provides a high level of safety and
control over the discharge of combustion products. This thermostat cuts off the supply of gas to the
burner in the event of a faulty flue draft.

If the FLUE GAS SAFETY THERMOSTAT has been activated, you should unscrew the protection cover
(part no. 5 in fig. 2a and 2b) and manually
“reset” the thermostat. After that, the boiler
will return to normal operation.

Boiler rear view

If the FLUE GAS SAFETY THERMOSTAT
needs to be replaced, use original
manufacturer’s parts only and make sure
the electric connections and positioning of
the bulb (see fig. 4) are correct; NEVER
UNDER ANY CIRCUMSTANCES LEAVE
THE FLUE GAS SAFETY THERMOSTAT
DISCONNECTED FROM THE ELECTRIC
CIRCUIT.

In case of frequent tripping of the thermo­static switch, contact qualified personnel
only.

During cleaning of the draft diverter, be
careful not to damage the thermostat phial.

Flue gas safety
thermostat phial

Fig. 4

Pegasus F2

7

3. BOILER INSTALLATION

(To be performed by qualified personnel only)

3.01 General warnings

The boiler should be installed according to current regulations (see para 1.02).
We suggest fitting isolating valves between the boiler and the heating system to isolate the boiler from

the system if necessary.
The rise in temperature of the heating water (the difference between the water flow and return

temperatures) should not exceed 20°C. This is so as to prevent possible damage caused by
condensation forming in the boiler.

Combustion products should be discharged through a flue with a cross section in accordance with
current standards and not less than the boiler flue outlet connection.

Connect the gas to the boiler in accordance with current regulations. The diameter of the boiler gas
inlet gas pipe does not dictate the choice of diameter for the pipe between the boiler and the gas meter
should be calculated based upon its length and pressure drop.

3.02 Boiler water characteristics

When the water supply has a hardness of more than 25 - 30 Fr., it should be treated before entering
the heating system to prevent both scaling (caused by hard water) and corrosion (caused by aggressive
water) in the boiler. Please remember that because of their low thermal conductivity, even small scales
just a few millimetres thick cause the boiler walls to overheat considerably with serious consequences.

You must treat the water used for the heating system in the following cases:
A) Very large systems (with large volumes of water).

B) Systems where partial or complete draining - and water refilling - are frequent.

Pegasus F2

8