Page 46
4.14.7
Multiple units using
zones pumps and an
indirect for DHW
1. This piping diagram is meant to show system piping concept only. Installer is responsible for all
equipment and detailing required by local codes.
2. All closely spaced tees shall be 12” (or 4 pipe diameters) center to center spacing.
3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all
closely spaced tees.
4. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
5. Install a check valve on the return line to the boiler.
6. Manufacturer strongly recommends the use of an anti-scald mixing valve at domestic hot water outlet
(boiler location) to reduce potential for scalding. Contact Manufacturer for recommended models.
Check with local codes.
7. Auto Fill Valve and Backflow Preventer Valves are NOT included (Field Supplied).
8. DHW Sensor/Aquastat must connect to LEAD boiler. It is strongly recommended to use a DHW sensor
in case of high DHW set points.
CH RETURN
ZONE
1
ZONE
2
ZONE
3
1
1/4”
1
1/2”
Min
OR
piping
depending on
boiler size
PRIMARY LOOP (SPACE HEATING)
Do not
exceed
12"
See
Note
SECONDARY LOOP
(SPACE HEATING)
CH
SUPPLY
CH
SUPPLY
CLOSELY
SPACED TEES
CH RETURN
Make-Up Water
DHW
Pump
Indirect DHW Tank
Follower
Leader
CASCADE
SYSTEM
SENSOR
Circulation pump
Check valve
Drain valve
Gate valve
Backflow preventer
Pressure Relief Valve
Expansion tank
Air separator
(Diaphragm-type)
Automatic air vent
Anti-scald rated
Mixing Valv
e
4.14 Plumbing Guidelines (continued)
Summary of Contents for FT Series
Page 52: ...Page 52 4 20 Ladder Diagram ...
Page 70: ...Page 70 6 2 Fault Tree Analysis 6 2 1 1 Flame detection ...
Page 80: ...Page 80 SECTION 10 Parts 10 1 100 MBH Casing Assembly ...
Page 82: ...Page 82 Heat Exchanger Assembly 100 MBH ...
Page 84: ...Page 84 Blower Assembly 100 MBH ...
Page 86: ...Page 86 Casing Assembly 10 2 140 MBH ...
Page 88: ...Page 88 Heat Exchanger Assembly 140 MBH ...
Page 90: ...Page 90 Blower Assembly 140 MBH ...
Page 92: ...Page 92 Casing Assembly 10 3 199 MBH ...
Page 94: ...Page 94 Heat Exchanger Assembly 199 MBH ...
Page 96: ...Page 96 Blower Assembly 199 MBH ...
Page 98: ...Page 98 Notes ...
Page 99: ...The FT Series Heating Only Boiler Page 99 Notes ...