Hamworthy Wessex ModuMax mk3 WM254/254H User Manual

Wessex ModuMax mk3 Boilers
Condensing
Fully Modulating, Pre-Mix, Gas Fired,
Modular Boilers for Heating and
Domestic Hot Water Installations
Installation, Commissioning and Servicing
Instructions
Models– 97, 116,
147, 196 & 254
NATURAL GAS I2H
LPG Propane I3P
IMPORTANT NOTE
THESE INSTRUCTIONS MUST BE READ
AND UNDERSTOOD BEFORE INSTALLING,
COMMISSIONING, OPERATING OR
SERVICING EQUIPMENT

Hamworthy Wessex ModuMax mk3 WM254/254H Specifications

General

Output	254 kW
Fuel Type	Natural Gas / LPG
Efficiency	Up to 109% (Gross CV)
Weight	Approx. 450 kg (Empty)
Gas Type	Natural Gas / LPG
Max. Net Heat Output 80/60°C	254 kW
Maximum working pressure	6 bar
Model	WM254/254H
Type	Condensing modular boiler
NOx Class	5
Flow & Return Connections	2" BSP (Female)

Summary

4.0 SITE LOCATION AND PREPARATION

4.1 Site Location.

4.2 Gas Supply.

Requirements for gas supply pipework, connections, and pressure.

4.3 Flueing

4.4 Water Supply

4.5 Condensate Connections

4.6 ELECTRICAL SUPPLY

6.0 PRE-COMMISSIONING

6.1 Gas Supply.

6.3 Pipework, Valves and Pump

7.0 Checks Prior to Lighting

7.1 Boiler Gas System Leak Check

Procedure for checking the boiler's gas system for leaks.

8.0 INITIAL LIGHTING

8.2 Controls Operation

8.6 Combustion Checks

9.0 FAULT FINDING

9.1 Safety Temperature Limiter (Limit Thermostat)

Understanding the safety temperature limiter and its function.

9.2 Ignition Controller

How the ignition controller monitors flame and handles faults.

10 SERVICING

10.1 Regular Servicing

Importance of regular servicing by Hamworthy appointed persons.

10.2 Annual Service

Procedure for annual servicing of individual boiler modules.

11.0 REPLACEMENT OF FAILED COMPONENTS

11.1 Hot Surface Igniter and Flame Probe Assembly

Procedure for replacing the igniter and flame probe assembly.

11.4 Gas Valve

Procedure for replacing the gas valve.

11.7 Burner

11.9 Main Control - Navistem

11.12 Low Gas Pressure Switch

APPENDIX B - ELECTRICAL CONNECTIONS AND CONTROLS

B1.1 Electrical Supply

Detailed safety and installation requirements for the electrical supply.

APPENDIX C - FLUE DATA

Boiler Parameter Settings: Single Boiler

Internal time clock with two heating circuits, DHW & boiler shunt pump

Boiler Parameter Settings: Multiple Boilers

Sequence control using integral Master and Slave configuration

BMS 0-10v Power Control

BMS 0-10v Temperature

Boiler Parameter Settings: Multiple Boilers With External Merley Boiler Sequence Controller