Super Hot EPJ-119-SC, Инструкция по установке и обслуживанию

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EPJ SERIES INDIRECT WATER HEATERS – Installation and Service Manual
8
Water Piping Section 3
3.1 BOILER WATER PIPING
Connect boiler out (hot) supply piping to the “BOILER WATER IN” fitting on the tank. The “BOILER WATER
OUT” fitting on the tank should be piped to the boiler return. Use Teflon tape, pipe dope, or both on all
threaded fittings. When installing the pump make sure that the direction arrow is pointing in the same
direction as the flow. The use of shut off valves and brass or dielectric unions are recommended when
installing your water heater for future service convenience and to prevent galvanic corrosion.
To prevent heat loss due to gravity flow from the coil, a check valve or heat trap with a minimum 12 inch
drop should be installed as close to the “boiler water in” fitting as practical. For systems with two or more
circulators, a check valve may be used to prevent thermal siphoning from circulator draw.
The heat output of the tank is based on the temperature and flow rate from the boiler supply. To ensure
that the minimum flow rate is provided, the diameter of the pipe between the boiler and tank must be
equivalent to or larger than the diameter of Boiler Water connections on the tank (see section 1.2
Dimensions ). There should be no excessive restrictions due to components (e.g. zone valve, check valve,
fittings) or the design of the piping system (e.g. length of run, number of elbows). If a zone valve is used, it
should be a minimum of 1” full port and have a flow coefficient of at least C
V
= 8.
Hot Water Priority
A boiler system connected to multiple zones may be installed so that domestic water heating will be given
priority over other zone heating. If hot water priority is used, preventative measures must be taken to ensure
hot water priority during cold weather conditions does not result in freezing damage to the other zones.
Zone Circulator System
This system is run the same as a standard heating zone except one zone is piped to the water heater and
can be prioritized by using a zone circulator (pump).
Zone Valve System
This system is run the same as a standard heating zone except one zone is piped to the water heater and
can be prioritized by using a zone valve.
3-way Zone Valve System
This system overrides the heat demands of all other zones when there is a heat demand from the water
heater aquastat and diverts all boiler water to the water heater. There are three ports on a 3-way valve: a
common port, a normally closed port, and a normally open port. The common port is connected to the boiler
supply side, the normally open port is connected to the heating zones, and the normally closed port is
connected to the “boiler water in” fitting of the water heater. The 3-way valve normally allows boiler water
to flow through the normally open port to the heating zones. When there is a heat demand from the water
heater aquastat, the 3-way valve diverts all boiler water through the normally closed port to the water heater.
Sample Systems
Although there are many possible system designs for your indirect water heater, a few of the most common
are described below. Note that all zones can be controlled by using either circulators or zone valves as long
as the adequate flow is provided. Always ensure that the circulator is correctly sized to provide the required
Boiler Water Flow Rate to the water heater.

Dedicated Single Boiler with Single Tank

Radiant Floor / Baseboard with 3 Port Zone Valve – Domestic Priority

Radiant Floor / Baseboard with 2 Port Zone Valve – Domestic Priority

Radiant Floor / Baseboard Using Circulator and Domestic Hot Water Priority

Multiple Water Heaters – Domestic Priority

Multiple Water Heaters Piped in Series