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O. Applications
HOT WATER OUTLET
COLD WATER INLET
DRAIN
Figure 5 - Space Heating - Indirect Priority
FIGURE NOTES:
1. This drawing is meant to demonstrate system piping
concept only.
2. A mixing valve is recommended if the DHW temperature
is set above the factory setting of 119
3. Install a minimum of 12 diameters of straight pipe
upstream of all circulators.
4. Install a minimum of 6 diameters of straight pipe up and
downstream of all closely spaced tees.
5. Piping shown is Primary/Secondary.
6. The minimum pipe size for connecting an indirect fired
water heater is 1".
7. The minimum pipe size for connecting a boiler is 3" for
both the 1000 and 1700 models.
8. System flow (Secondary Loop) must be greater than the
boiler's Primary Loop flow.
9. Installations must comply with all local codes.
10. In Massachusetts, a vacuum relief valve must be
installed on the cold water line per 248 CMR.
11. If boiler supply temperature for DHW is set higher than
central heating and system pump is not powered by the
master boiler, the central heating circuit must be protected
by a thermostatic mixing valve.
An ASSE 1017 thermostatic mixing valve is recommended on all tanks if the hot water temperature leaving the tank is above 119
to do so could result in substantial property damage, serious injury, or death.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer's instructions to properly support the circulator.
Failure to comply with these instructions could result in property damage, severe personal injury, or death.
LOW LOSS HEADER
o
F.
AIR SEPARATOR
CONNECTIONS
CONNECTIONS
HOT
NEUTRAL
HOT
NEUTRAL
HOT
LINE NEUTRAL
LINE HOT
Figure 6 - Space Heating - Indirect Priority Wiring
whl-428-r1 Rev. 001 Rel. 012 Date 7.21.20
19
FOLLOWER
CONNECTIONS
CONNECTIONS
NEUTRAL
HOT
NEUTRAL
HOT
LINE NEUTRAL
LINE HOT
o
F. Failure
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