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| LAARS HEATING SYSTEMS | |||||||||||||||
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Figure 14. EBP Domestic Water Piping with Recirculating Loop.
WARNING
Failure to install a hot water tempering (mixing) valve (12) creates a scalding hazard with potential for serious bodily injury. Some brands of tempering (mixing) valves are not designed as
Where domestic water is supplying multiple apartments or large whirlpool tubs, additional storage tank may be connected as shown in Figure 13. The bronze circulator shown must be connected to tank aquastat and must not run continuously. If the circulator is wired to run continuously, unit's domestic water flow switch will keep the unit in domestic water priority, and no water will be allowed to be sent to the heating system.
SECTION 4.
Hydronic Heat Piping
4A. Hydronic Piping
The appliance incorporates its own circulating pump and bypass loop and is capable of providing flow through heating zones, in addition to what it needs for itself. Model size 110 is capable of providing flow for two heating zones (up to 67 feet of ¾" baseboard each), and model 175 is capable of providing flow for four heating zones (up to 67 feet of ¾" baseboard, each).
EDP/EDN boilers installed in radiant (in floor) systems and other low mass boilers should be provided with a buffer/blender tank to assure a controlled supply temperature, and to prevent short cycling. In radiant systems utilizing
bypass pipe must be installed between supply and return piping.
1.EBP ONLY: Connect system supply to 1¼" supply connection marked “SUPPLY”.
2.EDP/EDN ONLY: Connect 1¼" thermostatic union to system supply connection in direction designated with union.
3.Pipe the discharge of the relief valve, full size, to a drain or in a manner to prevent injury in the event of pressure relief.
4.Install an air purger in flow supply line as shown in Figures 15, 16 or 17.
5.Install automatic float type air vent on air scoops.
6.Install a diaphragm expansion tank in boiler outlet piping. To ensure sufficient expansion volume for the hydronic system water, due to
NOTE: Never install expansion tank and auto fill valve on return.
7.If necessary, install a properly sized circulator with optional isolation valves in supply beyond expansion tank.
Caution
All hot water pipes must be installed with a minimum 1" (25mm) clearance from combustible materials.
8.Connect boiler feed water supply with shut off valve to inlet connection of automatic fill valve. Locate in boiler outlet piping.
9.If codes require, install suitable back flow preventer between automatic fill valve and city main.
10.The appliance may be installed in single and multiple zone systems (using either zone valves