andrews CWH90/300 User Manual

Working towards
a c le ane r fu tu re
MAXXflo
In s ta lla tion g u id e , op e ra tion
a n d m a in te n a n c e m a n u a l
High Efficiency Condensing
S ta inless S teel S tora ge
W a ter Hea ters for
N a tu ra l G a s a nd P rop a ne
N a tu ra l G a s Mod e ls
CW H3 0 /1 0 0 , CW H3 0 /2 0 0 , CW H3 0 /3 0 0
CW H6 0 /2 0 0 , CW H6 0 /3 0 0
CW H9 0 /2 0 0 , CW H9 0 /3 0 0
CW H1 2 0 /2 0 0 , CW H1 2 0 /3 0 0
P rop a n e Mod e ls
L CW H3 0 /1 0 0 , L CW H3 0 /2 0 0 , L CW H3 0 /3 0 0
L CW H6 0 /2 0 0 , L CW H6 0 /3 0 0
L CW H9 0 /2 0 0 , L CW H9 0 /3 0 0
L CW H1 2 0 /2 0 0 , L CW H1 2 0 /3 0 0
This manual must be kept with the appliance J a n 2 0 0 9
P a rt N o. E2 8 1
MAXXflo_Manual_Dec08_QX2 12/1/09 1:13 pm Page 2

andrews CWH90/300 Specifications

General

Brand	andrews
Model	CWH90/300
Category	Water Heater
Language	English

Summary

SECTION 1 GENERAL AND SAFETY INFORMATION

Health and Safety Regulations 1993

Details legal responsibilities and essential safety precautions for users and installers.

Legionellae Prevention

SECTION 3 INSTALLATION

Installation Requirements and Location

Covers legal prerequisites, installer qualifications, and ideal installation site criteria.

Gas Supply Requirements (Natural Gas & Propane)

Outlines installation guidelines and pressures for both Natural Gas and Propane supplies.

Electrical Supply and Connection Details

Specifies electrical power requirements and terminal block connection procedures.

Wiring Diagram

Presents the detailed electrical wiring schematic for the water heater unit.

Flue Terminal Position Requirements

Specifies minimum clearance distances for flue terminals based on location.

Air Supply and Ventilation for Concentric Flues

Outlines air vent requirements for installations using concentric flue systems.

Air Supply and Ventilation for Conventional Flues

Details air vent requirements for installations using conventional flue systems.

SECTION 5 INSTRUCTIONS FOR COMMISSIONING

Commissioning and CO2 Adjustment Overview

Introduces the commissioning process and the importance of CO2 measurement.

Full Load CO2 Measurement and Setting

Details how to measure and adjust CO2 levels for optimal performance at full load.

Low Load CO2 Measurement and Setting

Details how to measure and adjust CO2 levels for optimal performance at low load.

SECTION 6 FAULT CODES

Fault Code Display and Resetting

Explains how fault codes appear and how to reset lockout faults.

Master Board Blocking Codes

Lists and explains specific fault codes related to the master control board.

Slave Board Fault Codes

Lists and explains specific fault codes for slave boards (lockout and blocking).

SECTION 7 MAINTENANCE

Annual Maintenance Schedule