Design Manual

2 R-TRWH-E-02 Rev D
Certifications ................................................................ 3, 4
Rinnai Accessories ......................................................... 4
MSB Kits for Connecting Multiple Water Heaters ........ 5
Model Applicability .......................................................... 6
Water Quality and Scale ................................................. 7
Pump Sizing for Circulation ........................................... 8
Tank Water Heaters in a Circulation Loop .................... 9
Additional Guidelines ..................................................... 9
Vent Termination Clearances ....................................... 10
Additional Clearances ................................................... 12
Pump Sizing for Storage Tank Applications .............. 14
Pressure Loss Curves - Non Condensing Models ..... 15
Pressure Loss Curves - Condensing Models ............. 16
Condensing Water Heaters
Drawing No. Description
CWH1 1 Basic Piping ................................... 17
CWH2 2 Basic Piping ................................... 18
CWH3 3 Basic Piping ................................... 19
CWH6 6 Basic Piping ................................... 20
CWH1-C 1 Circulation System ........................ 21
CWH2-C 2 Circulation System ........................ 22
CWH3-C 3 Circulation System ........................ 23
CWH6-C 6 Circulation System ........................ 24
CWH1-BC 1 Backup Storage ............................. 25
CWH2-BC 2 Backup Storage ............................. 26
CWH3-BC 3 Backup Storage ............................. 27
CWH6-BC 6 Backup Storage ............................. 28
Non-condensing Water Heaters
Drawing No. Description
WH1 1 Basic Piping ................................... 29
WH2 2 Basic Piping ................................... 30
WH3 3 Basic Piping ................................... 31
WH6 6 Basic Piping ................................... 32
WH1-D 1 Freeze Protection .......................... 33
WH2-D 2 Freeze Protection .......................... 34
WH3-D 3 Freeze Protection .......................... 35
WH6-D 6 Freeze Protection .......................... 36
WH1-RGE 1 Optional Recirculation ................... 37
WH1-R 1 Optional Recirculation ................... 38
WH1-CD-O 1 Preferred Demand Circulation ....... 39
WH1-CD 1 Preferred Demand Circulation ....... 40
WH2-CP 2 Circulation System ........................ 41
WH3-CP 3 Circulation System ........................ 42
WH6-CP 6 Circulation System ........................ 43
WH1-BC 1 Backup Storage ............................. 44
WH2-BC 2 Backup Storage ............................. 45
WH3-BC 3 Backup Storage ............................. 46
WH6-BC 6 Backup Storage ............................. 47
WH1-AHU 1 Hydronic Furnace .......................... 48
WH1-AHU-RES 1 Hydronic Furnace and
Heat Exchanger............................. 49
WH1-A1-CD 1 Demand Circulation with 1 Rinnai
Hydronic Furnace .......................... 50
WH2-A1-CD 1 Combination System with 2 Rinnai
Hydronic Furnaces ........................ 51
WH1-AH 1 Generic Air Handler ....................... 52
WH1-S-1 1 Solar Backup ................................. 53
Maintenance Procedure
WH1-F 1 Flush Procedure ............................ 54
Legend ......................................................................... 55
Table of Contents