Specifications

5
LP- 276 REV. 9.4.14
C. SYSTEM WATER PIPING METHODS ..................................................................................................................................... 16
D. CIRCULATOR PUMPS ............................................................................................................................................................. 16
E. INSTALLATION OF THE FLOW SWITCH ................................................................................................................................ 17
F. SCALDING ................................................................................................................................................................................ 19
G. HIGH VELOCITY CIRCULATOR PUMP .................................................................................................................................. 20
H. WATER CHEMISTRY ............................................................................................................................................................... 20
I. PIPING DIAGRAMS ................................................................................................................................................................... 22
PART 5 – VENTING, COMBUSTION AIR AND CONDENSATE REMOVAL............................................................................ 28
A. GENERAL ................................................................................................................................................................................. 28
B. APPROVED MATERIALS FOR EXHAUST AND INTAKE AIR VENTS .................................................................................... 29
C. REQUIREMENTS FOR INSTALLATION IN CANADA .............................................................................................................. 30
D. EXHAUST VENT AND INTAKE AIR VENT PIPE LOCATION .................................................................................................. 31
E. EXHAUST VENT AND INTAKE AIR VENT SIZING .................................................................................................................. 33
F. LONGER VENT RUNS ............................................................................................................................................................. 34
G. EXHAUST VENT AND INTAKE AIR PIPE INSTALLATION ..................................................................................................... 34
H. BOILER REMOVAL FROM A COMMON VENT SYSTEM ....................................................................................................... 35
I. SIDEWALL VENTING DIAGRAMS ............................................................................................................................................ 36
J. VERTICAL VENTING DIAGRAMS ............................................................................................................................................ 38
PART 6 – GAS PIPING .............................................................................................................................................................. 40
A. GAS CONNECTION ................................................................................................................................................................. 40
B. GAS PIPING ............................................................................................................................................................................. 40
C. GAS TABLE .............................................................................................................................................................................. 41
D. CHECK INLET GAS PRESSURE ............................................................................................................................................. 41
E. GAS VALVE .............................................................................................................................................................................. 42
PART 7 – FIELD WIRING .......................................................................................................................................................... 44
A. INSTALLATION MUST COMPLY WITH: .................................................................................................................................. 44
B. FIELD WIRING TERMINATIONS .............................................................................................................................................. 44
C. FIELD WIRING CONSIDERATIONS ........................................................................................................................................ 44
D. LINE VOLTAGE WIRING .......................................................................................................................................................... 45
E. ALARM CONNECTIONS .......................................................................................................................................................... 45
F. LOW VOLTAGE CONNECTIONS FOR STANDARD BOILER ................................................................................................. 46
G. TANK SENSOR OR MECHANICAL CONTROL ....................................................................................................................... 46
H. SYSTEM / PIPE SENSOR ........................................................................................................................................................ 46
I. OPTIONAL HIGH GAS PRESSURE SWITCH ........................................................................................................................... 46
J. OPTIONAL LOW GAS PRESSURE SWITCH ........................................................................................................................... 46
K. FLOW SWITCH......................................................................................................................................................................... 46
L. WIRING OF THE CASCADE SYSTEM COMMUNICATION BUS ............................................................................................. 46
M. VWH CASCADE MASTER PUMP AND SENSOR WIRING ..................................................................................................... 47
N. VWH CASCADE FOLLOWER PUMP AND SENSOR WIRING ................................................................................................ 48
PART 8 – START-UP PREPARATION...................................................................................................................................... 50
A. CHECK / CONTROL WATER CHEMISTRY ............................................................................................................................. 50