Burnham Apex APX399 - Page 53

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VI. Water Piping and Trim E. Multiple Boiler Installation Water Piping (continued)
Figure 38B: Isolation of the Boiler From Oxygenated Water with A Plate Heat Exchanger
(IWH Piped Off System Header)
E. Multiple Boiler Installation Water Piping - See Table 17
and Figures 39B and 40B.
1. Refer to this Section of this manual for:
a. Installation of Factory Supplied Piping and Trim
Components for an individual module (boiler).
b. Regarding an individual module (boiler) piping
system specic details.
c. Selection criteria for individual module (boiler)
space heating and/or DHW circulators.
2. For installations where indirect domestic hot water
heater is combined with space heating, the Alliance
SL™ model must be piped as a separate heating
zone off the system header. The circulator must be
sized based on the Alliance SL™ model coil ow and
combined coil pressure drop and the zone piping total
equivalent length. Refer to Alliance SL™ Indirect
Water Heater literature for a specic model coil ow
and pressure drop. Refer to Table 18 and Figures 40A
and 40B.