Use and Care Manual

33
Burner
Air & Gas
Mixing
Burner
Air & Gas
Mixing
DHW
Plate
Heat
Exchanger
Primary Heat
Exchanger
Secondary Heat
Exchanger
Primary Heat
Exchanger
Secondary Heat
Exchanger
Circulation Pump
Gas
Condensate
Cold Water Inlet
(DHW)
Hot Water Outlet
(DHW)
Pressure Relief Valve
(DHW)
Pressure Relief Valve
for Heating
Circulation Pump
Gas
Condensate
Heating Supply
Heating Return
Auto Feeder
Pressure Relief Valve
for Heating
Auto Feeder
DHW
Plate
Heat
Exchanger
AUTODESK � � � � � � � � � �
AUTODESK � � � � � � � � � �
AUTODESK � � � � � � � � � �
AUTODESK � � � � � � � � � �
Piping symbol legend
Figure 19 – Piping Legend
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 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 ¾" diameter and Heating piping should be 1" in diameter.
5. Piping shown is Primary/Secondary. System ow (secondary loop) must be greater than the appliance’s primary loop ow.
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.
8. Unit is equipped with built-in primary pump for the heating loop. This pump is sized to ensure proper ow 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 backow preventer valve in the make-up water supply to the unit as required by local codes.
AUTODESK � � � � � � � � � �
AUTODESK � � � � � � � � � �
AUTODESK � � � � � � � � � �
AUTODESK � � � � � � � � � �
DIAPHRAGM (OR BLADDER) EXPANSION TANK
Always install an automatic air vent on top of the air separator to remove residual air from the system.
2. The expansion tank must be located following recognized design methods. See expansion tank manufacturer’s instructions for details.
3. Connect the expansion tank to the air separator only if the air separator is on the suction side of the circulator. Always install the system ll
connection at the same point as the expansion tank connection to the system.
Use both thread tape and pipe dope to connect to the 1" heating water outlet and inlet.
CAUTION
CAUTION
Undersized expansion tanks cause system water to be lost from the relief valve, causing make-up water to be added. Eventual appliance failure
can result due to excessive make-up water addition. SUCH FAILURE IS NOT COVERED BY WARRANTY.
Use at least the MINIMUM pipe size for all appliance loop piping (connecting appliance to and from the primary/secondary connection). DO NOT
pipe the appliance in any conguration other than primary/secondary. All piping methods shown in this manual use primary/secondary connection.
This is to avoid the possibility of inadequate ow through the appliance. Using less than the required minimum pipe size and piping in anything
other than a primary/secondary installation could result in system problems, property damage, and premature appliance failure. Such problems
ARE NOT covered by product warranty.