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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
Figure 6-13: Isolation of the Boiler From Oxygenated Water with A Plate Heat Exchanger
(IWH Piped Off System Header)
E. Multiple Boiler Water Piping
1. See Figure 6-16 for example multiple boiler
piping.
2. Install one header sensor in system piping
downstream of the boiler supply connection.
See Figure 6-16 for header sensor location and
Figures 6-14 and 6-15 for installation detail.
Wire header sensor to Sequencer Master
boiler. See also Section 8 “Electrical” and
Section 10 “Operation”.
3. 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 flow and combined
coil pressure drop and the zone piping total
equivalent length. Refer to Alliance SL™
Indirect Water Heater literature for specific
model coil flow and pressure drop. Refer to
Figure 6-16.
Figure 6-14: Recommended Direct Immersion
Header Sensor or DHW Sensor Installation Detail
Figure 6-15: Alternate “Immersion” Type Header
Sensor or DHW Sensor Installation Detail
Figure 6-16: Multiple Boiler Water Piping w/Domestic Hot Water Heater (Page 1 of 2)
6 Water Piping and Trim (continued)
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