Installation Guide

2
Contents
1 Before Installation 3
2 About the Water Heater 5
2.1 Included Accessories ....................... 5
2.2 Optional Accessories ....................... 5
2.3 Specifications ................................... 7
2.4 Dimensions ...................................... 8
2.5 External View ................................... 10
3 Choosing an Installation Location 11
4 Installation Clearances 13
4.1 Indoor Installation ........................... 13
4.2 Outdoor Installation ........................ 14
4.3 For Quick Connect Multi-System ..... 14
5 Installation of the Water Heater 15
5.1 Mounting the Water Heater
to the wall ........................................ 15
5.2 Elevation Adjustment Above
2,000 ft ............................................. 16
5.3 Filling the condensate container
with water ........................................ 16
6 Venting the Water Heater 17
6.1 Venting Installation Sequence ......... 17
6.2 General Requirements ..................... 17
6.3 Select a Vent Type ............................ 20
6.4 Vent Pipe Installation (Direct Vent) .. 21
6.5 Vent Pipe Installation
(Non-Direct Vent) ............................ 27
6.6 Outdoor Installation ........................ 31
7 Connecting the Gas Supply 32
8 Connecting the Water Supply 36
8.1 Installation ....................................... 36
8.2 Water Treatment ............................. 38
9 Connecting the Condensate Drain 40
10 Connecting Electricity 42
10.1 Water Heater ................................... 42
10.2 Remote Controller ........................... 42
10.3 Recirculation Pump .......................... 43
10.4 Quick Connect Cord-2 ..................... 44
11 Installation of the Remote Controller 45
12 Setting the DIP Switches 49
13 Trial Operation 50
14 Checklist After Installation 52
15 Plumbing Applications 54
16 Installation of the Quick Connect
Multi-System 56
17 Installation of the Multi-System 57
17.1 With the System Controller
(SC-401-6M) ..................................... 57
17.2 With the System Controller Unit
(SCU-401-12M, SCU-401-24M) ....... 61
18 Maintenance 65
18.1 Periodic Check ................................. 65
18.2 Procedure for Flushing the Heat
Exchanger ........................................ 66
Contents