21
WHL-016 REV. 12.18.14
C. BACKFLOW PREVENTER
Use a backflow preventer specifically designed for hydronic installations. This valve should be installed on the cold water fill supply line
per local codes (see Piping Details, Part 5, Section G).
D. SYSTEM WATER PIPING METHODS
EXPANSION TANK AND MAKE-UP WATER
1. Ensure that the expansion tank is designed and sized to correctly handle system water volume and temperature. For sizing
information, refer to expansion
tank manufacturer’s sizing guidelines or the latest ASHRAE expansion tank sizing standards.
Expansion tanks must be sized according to total system volume. This includes all length of pipe, all fixtures, boilers, etc. Failure to
properly size system expansion could result in wasted time, money, and possible property damage, personal injury, or death.
ADDED VOLUME TO SYSTEM BY BOILER
MODEL
GALLONS
055 / 080
2.2
110
2.6
155
6.2
199
6.1
285
6.1
399
7.9
Table 3
Undersized expansion tanks cause system water to be lost from the relief valve, causing make-up water to be added. Eventual boiler
failure can result due to excessive make-up water addition.
SUCH FAILURE IS NOT COVERED BY WARRANTY.
2. The expansion tank must be located as shown in Part 5, Boiler Piping, or following recognized design methods. See expansion tank
manufacturer’s instructions for details.
3. Connect the expansion tank to the air separator only if the air separator is on the side of the circulator. Always install the system fill
connection at the same point as the expansion tank connection to the system.
DO NOT
install automatic air vents on closed type expansion tank systems. Air must remain in the system and return to the tank to
provide an air cushion. An automatic air vent would cause air to leave the system, resulting in improper operation of the expansion tank.
DIAPHRAGM (OR BLADDER) EXPANSION TANK
Always install an automatic air vent on top of the air separator to remove residual air from the system.
E. CIRCULATORS
DO NOT
use the boiler circulator in any location other than the ones shown in this manual. The boiler circulator location is selected to
ensure adequate flow through the boiler. Failure to comply with this caution could result in unreliable performance and nuisance
shutdowns from insufficient flow.
Sizing Space Heat System Piping
1. See Piping Details, Part 5, Section G. In most diagrams, the space heating system is isolated from the boiler loop by the
primary/secondary connection.
2. Size the piping and components in the space heating system using recognized design methods.
Summary of Contents for WBCNG399W
Page 14: ...14 WHL 016 REV 12 18 14 SPECIFICATIONS AND DIMENSIONS Figure 2 Specifications and Dimensions ...
Page 24: ...24 WHL 016 REV 12 18 14 Figure 8 Piping Symbol Legend ...
Page 59: ...59 WHL 016 REV 12 18 14 Figure 32 Cascade Master and Follower Wiring ...
Page 60: ...60 WHL 016 REV 12 18 14 Figure 33 Internal Connection Diagram LP 293 J ...
Page 83: ...83 WHL 016 REV 12 18 14 055 080 110 PARTS BREAKDOWN Figure 36 Replacement Parts LP 387 J ...
Page 85: ...85 WHL 016 REV 12 18 14 155 199 285 399 PARTS BREAKDOWN ...
Page 86: ...86 WHL 016 REV 12 18 14 Figure 38 Replacement Parts LP 387 KK ...
Page 87: ...87 WHL 016 REV 12 18 14 155 199 285 399 MODEL PARTS BREAKDOWN ...
Page 91: ...91 WHL 016 REV 12 18 14 ...
Page 92: ...92 WHL 016 REV 12 18 14 ...
