Installation requirements

This page provides an overview of the main installation and system requirements for the GB162. the full installation instructions supplied with the boiler must be adhered to before any work on the heating system takes place.

Worcester technical support teams are available to offer system design advice of if necessary make site visits. For more details call 0844 693 3028.

Frost protection

The boiler has integrated frost protection. The frost protection switches the boiler on at a central heating flow temperature of 7°C and switches it off at a central heating flow temperature of 15°C.

Designated use

The boiler may only be used to heat water for sealed heating systems up to 4 bar (65/80/100kW) or up to 3 bar (45kW). For greater system pressures or open vented systems separate the boiler from the heating system with a plate heat exchanger.

Quality of the heating system water

Thoroughly flush the system before filling it. Use only untreated tap water when filling the system. The use of dirty water will lead to build-ups of sludge and corrosion, which can in turn result in malfunctioning of the boiler and damage to the heat exchanger.

DO NOT treat the water with products such as pH-adjusting substances (chemical additives), antifreeze or water softeners. Sentinel X100 can be used to achieve the desired water quality. The concentration of Sentinel should be at least 1% of the volume of the water in the system.

The pH of the heating system water MUST be inbetween 7 and 8.5. if this is not the case, please contact Worcester Customer Service before proceeding.

Wiring diagram

A detailed wiring diagram showing how to wire the boiler and controls can be found on page 22 of the tech and spec or download it here. Use either dedicated controls which maximise efficiency or control the GB162 with an existing 0 to 10V signal.

Quality of pipe work

When using plastic pipe work in the heating system, e.g. for under floor heating, it has to be oxygen-tight according to relevant UK_Standards. If the plastic pipes do not comply with these standards, the system parts must be separated using heat exchangers.

Maintenance schedule

The activities to be included in a annual inspection and maintenance contract can be found in the service section of the installation manual. If inspection reveals a situation that makes maintenance activities necessary, these activities have to be carried out.

Connection of gas and water

GB162 - 65/80/100kW
These models do not contain a factory installed circulation pump. We recommend that the boiler be installed together with a GB162 accessory pump group. This will ensure that volumetric flow through the boiler is sufficient to handle the maximum boiler capacity. The pump group also makes for an easier and quicker install.

If the boiler is being mounted rather than frame mounted, a connection set ( Part no.558 4552) is required in order to connect the flow and return.

GB162 45kW
The boiler incorporates a modulating circulation pump.

When connecting the boiler as part of a cascade we recommend using the cascade pipe kit (7 746 900 898) which includes isolating valves.

For a single boiler installation or installations without a cascade frame set, an accessory pack is available containing gas and heating flow and return isolation valves. An under boiler cover (7 746 900 350) is available to complete a neat installation.

LPG conversion

The boiler can be converted to LPG use with the appropriate kit.