10
3.8 - Supply and
Return Piping
The central heating supply and return
pipes are marked with different
colored caps, (supply red and return
blue).
If the heater is to be connected to an
existing system it is advisable to
wash out and remove any deposits
from inside the existing pipes, and
install a filter at the lowest point to
trap any additional impurities when it
is running.
This equipment is designed for use
in a closed loop system.
The pressure of the heating system
side of the heater must be fitted with
devices (automatic water feed/
pressure reducing valve not to exceed
30 psi (2 bar)) adapted to function
automatically in order to maintain the
pressure of the heating side at a level
below that of the potable water leaving
the heat exchanger.
Installation schematics are found in
figures 26 to 40.
CAUTION!!!
All the
schematics in figures 26 to 40 are
only samples. Safety apparatus, pipe
diameters, and auxiliary accessories
must be verified by qualified
personnel and in accordance with the
national and/or local codes.
3.9 - Radiant
Heating
Installation
When the heater is used in
conjuction with radiant heating, it is
imperative that the tubing contains an
oxygen diffusion barrier. If you are
unsure whether or not the tubing has
a barrier, a stainless steel plate heat
exchanger must be used to protect
the heater from oxygen corrosion
(See figure 30). Oxygen corrosion will
also occur if the heater is used in an
open-loop system where new, cold-
fill water is introduced into the
system. The oxygen will remove itself
from solution and react chemically
with the ferrous components (i.e.
steel), causing them to rust and
corrode.
THIS TYPE OF FAILURE IS
NOT COVERED BY THE
WARRANTY!
3.10 - Installation
of two heaters
To install two heaters in parallel,
follow the diagram in figure 28.
3.11 - Installation
of three or more
heaters
Installing three or more heaters in
parallel. Follow the diagram in figure
29.
3.12 - Multi-zone
system with
several pumps
When creating a multi-zone system
with pump servicing the zone, it is
necessary to isolate the operating
pressure of the water heater circuit
from the pressure of the heating
system circuit. For this purpose,
install a hydraulic disconnector
between the heater and the system
(see fig. 31)
3.13 - Multi-zone
System
When creating a multi-zone system
it is necessary to follow the diagram
shown in figure 32.
3.14 - Internal
electrical
connection
settings
The water heater comes with a set of
electrical terminals for a variety of
system configurations, (inside
junction box):
- relays for several pumps; the water
heater is provided with terminals for
connecting a relay that controls
several pumps at the same time (see
figure 35)
- plate heat exchanger; the water
heater is provided with terminals for
connecting and controlling a plate
3 - INSTALLATION
heat exchanger for the production of
domestic hot water or for a swimming
pool (see figure 36)
- Indirect water heater; the heater is
provided with terminals for connecting
and controlling an indirect water
heater (see figure 33) This function
can also be combined with the relay
function for multiple pumps (see
figure 34)
- Cold start boiler; inside the junction
box there are two terminals (see
figure 7) marked with the numbers 5
and 6, connected together by a
jumper. Simply remove this jumper
to enable the heater to also function
as a cold start boiler.
3.15 - Use of
glycol
Toxic chemicals, such as those used
for boiler treatment, shall not be
introduced into the potable water
used for space heating.
CAUTION!!! If a non-
approved additive is used, it can
cause serious health problems or
possibly death.
If glycol is used with the heater, the
glycol must be recognized as safe
or approved by the United States
Food and Drug Administration for food
contact as listed in Code of Federal
Regulations, title 21, part 182 of the
Food Additive Regulations. Any
additives introduced into the heating
system
must
be recognized as safe
by the United States Food and Drug
Administration.
If glycol is used, it must be used in
compliance with the product
instructions. In any case, such
substances should not be added
directly inside the heater, but only
through a radiator.
3.16 - Domestic
Hot and Cold
water
The domestic hot water flow restrictor
must be installed on the cold water inlet,
(Refer to figures 26, 27, 30, 31 and 32).
For servicing purposes, install a shut-
off valve upstream from the cold water
inlet.
The heater’s thermostat can be
