Benchmark Procombi Exclusive 24 Installation & Servicing Instructions Manual page 8

INTRODUCTION
The Procombi Exclusive range of boilers are wall mounted, full
sequence, automatic spark ignition, low water content, fanned
flue, high efficiency, condensing, combination gas boilers.
Note. Due to the high efficiency of the boiler a plume of water
vapour will form at the terminal during operation.
Central heating (CH) output is fully modulating with a range of:
24 4.8 to 24.2kW (16,500 to 82,600 Btu/h)
30 6.1 to 24.2kW (20,700 to 82,600 Btu/h)
35 7.1 to 24.2kW (24,100 to 82,600 Btu/h)
Instantaneous domestic hot water (DHW) output is also fully
modulating with a maximum of :
24 24.2kW (82,600 Btu/h)
30 30.3kW (103,300 Btu/h)
35 35.3kW (120,500 Btu/h)
The boiler is supplied fully assembled with DHW plate heat
exchanger, diverter valve, circulating pump, pressure gauge,
safety valve and CH expansion vessel.
Variable CH and DHW temperature controls are fitted on the user
control and the boiler features a DHW preheat facility.
The boiler includes as standard:
- Automatic bypass
- Boiler frost protection
- Daily pump and diverter valve exercise
- Mechanical 24hr timer
The boiler casing is of white painted mild steel.
The boiler temperature controls are visible located in the control
panel on the front of the boiler.
The heat exchanger is manufactured from cast aluminium.
The boiler is suitable for connection to fully pumped, sealed
heating systems ONLY. Adequate arrangements for completely
draining the system by provision of drain cocks MUST be provided
in the installation pipework.
Pipework from the boiler is routed downwards.
Data Plate
The boiler model and serial number can be located on the bottom
of the boiler casing, shown in Frame 1 - Water & Gas Connection
Diagram.
OPERATION
With no demand for CH, the boiler fires only when DHW is drawn
off, or periodically for a few seconds without any DHW draw-off, in
order to maintain the DHW calorifier in a heated condition. This
only occurs if pre-heat on.
When there is a demand for CH, the heating system is supplied at
the selected temperature of between 45
is drawn off. The full output from the boiler is then directed via
the diverter valve to the plate heat exchanger to supply a nominal
DHW draw-off of
24 9.9 l/min at 35 o C temperature rise.
30 12.4 l/min at 35 o C temperature rise
o
35 14.5 l/min at 35 C temperature rise
The DHW draw off rate specified above is the nominal that the
boiler flow regulator will give. Due to system variations and
seasonal temperature fluctuations DHW flow rates/temperature
rise will vary, requiring adjustment at the draw off tap.
At low DHW draw-off rate the maximum temperature is limited to
o
64 C by the modulating gas control.
The boiler features a comprehensive diagnostic system which
gives detailed information on the boiler status when operating, and
performance of key components to aid commissioning and fault finding.
8
GENERAL
o C and 80 o C, until DHW
SAFE HANDLING
This boiler may require 2 or more operatives to move it to its
installation site, remove it from its packaging base and during
movement into its installation location. Manoeuvring the boiler may
include the use of a sack truck and involve lifting, pushing and pulling.
Caution should be exercised during these operations.
Operatives should be knowledgeable in handling techniques when
performing these tasks and the following precautions should be
considered:
• Grip the boiler at the base.
• Be physically capable.
• Use personal protective equipment as appropriate, e.g. gloves,
safety footwear.
During all manoeuvres and handling actions, every attempt should be
made to ensure the following unless unavoidable and/or the weight
is light.
• Keep back straight.
• Avoid twisting at the waist.
• Avoid upper body/top heavy bending.
• Always grip with the palm of the hand.
• Use designated hand holds.
• Keep load as close to the body as possible.
• Always use assistance if required.
OPTIONAL EXTRA KITS
•
Horizontal Flue Terminal - (1000mm long)
•
Horizontal Flue Terminal - (600mm long)
•
Horizontal Flue Terminal - (600mm long) Weather Protection
•
Flue Extension Ducts (1000mm long)
•
Flue Extension Ducts (2000mm long)
•
Flue Extension Ducts (500mm long)
24-up to 9m
30-up to 8m
35-up to 6m
• Elbow Kit (maximum per installation)
90 o
24-upto 6 elbows
30-upto 6 elbows
35-upto 4 elbows
• Elbow Kit (maximum per installation)
45 o
24-upto 6 elbows
30-upto 6 elbows
35-upto 4 elbows
• Telescopic B Pack
• Raised Horizontal Flue Outlet Kit
• High Level Flue Outlet Kit
• Flue Deflector Kit
• Balcony Flue Kit
• Soffit Flue Kit
•
Roof Flue Kit (to a maximum of 7.5m)
• Concentric Flue Screw Retaining Kit
• Weather Collar
• Adjustable Flue Support Bracket
• Flue Finishing Kit
• Stand-Off Kit
• Weather Compensation Kit
• Valve Cover Kit
• Condensate Pump Kit
• DHW Expansion Vessel Kit
• RF Mechanical Programmable Room Thermostat Kit
Procombi Exclusive -
Installation and Servicing