Hoval 51-UltraGas 2 620 User Manual

Subject to modifi cations |
EN
Technical information
Installation instructions
4 220 456 / 02 - 03/21
Hoval products must be installed and commissioned
by specialists only. These instructions are intended for
service engineers. Electrical installation must be per-
formed by a licensed electrical company.
Floor-standing gas condensing boilers UltraGas
®
2
(125-1550) acc. to EN 15502-1/15502-2-1 are suitable
and licensed for use as heat generators for hot water
heating systems with a permissible ow temperature of
up to 95 °C
1)
. They are designed for continuously con-
trolled reduced operation in heating systems.
1)
See technical data
UltraGas
®
2 (125-1550)
Gas condensing boilers
for natural gas in modulating operation
These instructions are applicable to the fol-
lowing types:
Nominal output ranges at 50/30°C
and natural gas
51-UltraGas
®
2 (125) 25 - 126 kW
51-UltraGas
®
2 (150) 35 - 151 kW
51-UltraGas
®
2 (190) 38 - 191 kW
51-UltraGas
®
2 (230) 51 - 233 kW
51-UltraGas
®
2 (300) 67 - 302 kW
51-UltraGas
®
2 (350) 73 - 350 kW
51-UltraGas
®
2 (400) 85 - 401 kW
51-UltraGas
®
2 (450) 96 - 453 kW
51-UltraGas
®
2 (530) 110 - 533 kW
51-UltraGas
®
2 (620) 136 - 622 kW
51-UltraGas
®
2 (700) 146 - 703 kW
51-UltraGas
®
2 (800) 166 - 804 kW
51-UltraGas
®
2 (1000) 205 - 999 kW
51-UltraGas
®
2 (1100) 229 - 1112 kW
51-UltraGas
®
2 (1300) 269 - 1320 kW
51-UltraGas
®
2 (1550) 324 - 1550 kW

Hoval 51-UltraGas 2 620 Specifications

General

Category	Boiler
Model	51-UltraGas 2 620
Type	Condensing Boiler
Fuel	Gas
Fuel Type	Natural Gas / LPG
Heat output	620 kW
Output Range	124 - 620 kW
Control System	TopTronic E

Summary

Important notices

General safety instructions

General safety guidelines for installation and operation, including warnings and essential conditions.

Explanation of symbols

Defines warning symbols, danger levels (DANGER, WARNING, CAUTION, NOTICE), and information icons.

Regulations and standards compliance

Lists applicable national and international regulations, standards, and directives for proper installation and use.

Installation

Set-up and space requirements

Details boiler positioning, dimensions, clearance, and suspension options for correct installation.

Thermal insulation and cladding installation

Covers the process of applying thermal insulation mats and installing the boiler's outer cladding panels.

Removing cladding for maintenance

Provides step-by-step instructions for safely removing boiler cladding to access internal components for service.

Technical information

Boiler description and data plate

Describes the UltraGas® 2 boiler's design principles and explains the meaning of data plate specifications.

Technical data tables

Lists comprehensive technical specifications, performance data, and dimensions for all UltraGas® 2 models.

Flow resistance and control functions

Details heating water side flow resistance curves and the functions of the BIC 970 automatic control device.

Initial commissioning

Safety instructions and system filling

Outlines safety precautions, system bleeding, and procedures for filling the heating system correctly.

Water quality requirements

Specifies required water quality standards for heating systems and replacement water according to regulations.

Pressure monitoring device functional check

Guides on performing a functional check of the pressure monitoring device and its safety switch.

Gas quantity and flue gas measurement

Detailed steps for setting gas quantity and measuring flue gas parameters (O₂, CO₂, NOx, CO) for optimal performance.

Maintenance

Safety instructions and basic checks

Safety guidelines and essential maintenance tasks such as deaeration, topping up water, and fuse replacement.

Boiler cleaning and maintenance procedures

Comprehensive steps for cleaning the gas boiler, combustion chamber, burner, and related components.

Gas quantity and flue gas measurement

Procedure for setting gas quantity and measuring flue gas parameters during maintenance checks.