Weil-McLain PLUS LINE PLUS-E017-A/1206 - Manual (Page 28)

28 Part Number PLUS-E017-A/1206
PLUS LINE
Indirect-Fired Water Heaters – Series 3
Install boiler-to-water heater piping
Combined space heating/water
heating applications
1. Figure 1 shows recommended piping between Gas
boiler and PLUS water heater. All show direct connection
of the water heater piping to the boiler because the boiler
circulator shuts down during water heater operation.
2. Table , page 29, uses the recommended flow rates for the
PLUS water heater and minimum flow rates for the
Gas boiler to provide recommended water heater piping
and circulator sizing. If using another circulator, verify it is
at least equal to the Taco selection given in Table , page 29.
For general information on head loss through boiler and
boiler-to-water heater piping, refer to the Gas Boiler
Manual.
. Procedure :
Step 1 : Select Gas Boiler model and water heater model
in Table , page 29.
Step 2: Read recommended minimum flow rate, GPM, in
table.
Step 3: Read across to find recommended minimum pipe size
for boiler-to-water heater piping.
Step 4: Read across to find recommended Taco circulator model.
Use a circulator with a pump curve at least equal to the
Taco circulator shown. See Figure 1, page 29 for pump
curves of typical Taco circulators.
Figure 14 Boiler-to-water heater piping — Combined
space heating/water heating application
3 Boiler relief valve (see Boiler Manual for piping details)
4 Relief valve discharge piping (see Boiler Manual for details)
5 Water heater circulator — must be at least equal in capacity to circulator
recommended in Table 3, page 29
6 Isolation valves
10 Flow/check valve (with weighted seat to prevent gravity circulation)
11 Purge/drain valves
Figure 15 Boiler-to-water heater piping —
Dedicated water-heating only application
Dedicated water heating-only
applications
1. Figure 1 shows recommended piping between Gas
Boiler and PLUS water heater for dedicated water-heating
only applications.
2. Pipe sizing :
Table , page 29, provides the recommended minimum pipe
size for boiler-to-water heater piping.
. Circulator :
Use the circulator recommended in Table , page 29. Install
the circulator as shown in Figure 1.
. Procedure :
Step 1 : Select Gas Boiler model and water heater
model in Table , page 29.
Step 2 : Read flow rate expected using the circulator speci-
fied inthe last column.
Step 3 : Size connecting piping as listed under “Boiler pip-
ing” in the table.
3 Boiler relief valve (see Boiler Manual for piping details)
4 Relief valve discharge piping (see Boiler Manual for details)
5 Water heater circulator — (see Table 4, page 29)
8 Expansion tank (diaphragm or bladder type)
6 Isolation valves
10 Flow/check valve (with weighted seat)
11 Purge/drain valve
20 Fill line to fill valve (item 23)
B2
Gas