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18 Plumbing Applications
18.1 General Requirements
1. This drawing 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 within 4 pipe
diameters or max 12 in. 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. The minimum pipe size of DHW piping should be
3/4" diameter and Heating piping should be 1" in
diameter.
5. Piping shown is Primary/Secondary. System
flow (secondary loop) must be greater than the
appliance's primary loop flow.
6. Install a minimum of 12 diameters of straight pipe
upstream of all circulators.
7. In a valve-based system, each heating zone has a
zone valve which opens when that zone calls for
heat.
Each zone thermostat is wired to its
corresponding zone valve. Contacts in the zone
valves provide a signal to the appliance to operate
when there is a call for heat.
18.2 Only install Combi Boiler as a Water Heater (Install Heating in the future)
This drawing is meant to show system piping concept only. Installer is responsible for all equipment & detailing
required by local codes.
* In case of installing external water feeder.
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP WATER
AIR SEPARATOR
74
Plumbing Applications
PRESSURE
GAUGE
Heating Supply
Heating Return
EXPANSION
TANK
8. Unit is equipped with built-in primary pump for
the heating loop. This pump is sized to ensure
proper flow rate through the appliance heat
exchanger and related piping. On long pipe runs,
it is recommended to keep the pump at maximum
speed (setting 3). DO NOT lower it from the
factory default.
9. Install a backflow preventer valve in the make-
up water supply to the unit as required by local
codes.
10. Do not install an external pump upstream an
expansion tank in heating supply pipe.
11. The expansion tank must be sized in accordance
with the water volume of the system as well
as the firing rate of the appliance. The tank
precharge pressure should equal the system fill
pressure for best operation.
* Equip a cap (1/2 in.) with the Auto Feeder
Water Inlet Connection when piping has not
been connected to the Auto Feeder Water Inlet
Connection (refer to pages 47, 63 [I:15_AFA]).
DHW Cold Water Supply
Recommended Pressure Setting: 15-30 psi
BALL VALVE
(TYPICAL)
DHW Supply
Auto Feeder
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