Weil-McLain EcoTec 80 Manual page 43

G -
®
ECO Tec
AS FIRED WATER BOILER
Install boiler water piping
Domestic Water Piping – Combi Boiler
H o t Wa t e r C a n S c a l d !
Consumer Product Safety Commission and some
states recommend domestic hot water temperature of
130°F or less.
When installing an automatic mixing valve, selection
and installation must comply with valve manufacturer's
recommendations and instructions.
Water heated to a temperature suitable for clothes
washing, dish washing and other sanitizing needs will
scald and cause injury.
Children, elderly, infirm or physically handicapped
persons are more likely to be injured by hot water. Never
leave them unattended in or near a bathtub, shower
or sink. Never allow small children to use a hot water
faucet or draw their own bath. If anyone using hot water
in the building fits this description, or if state laws or
local codes require certain water temperatures at hot
water faucets, take special precautions:
Install automatic mixing valve set according to those
standards.
Use lowest practical temperature setting.
Check water temperature immediately after first heating
cycle and after any adjustment.
If the boiler piping system is connected to heating coils located
in air handling units where there may be exposed to refrigerated
air circulation then it must be equipped with flow control valves
or other automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
see Figure 54, page 44.
1. Size piping for DHW inlet and outlet is 3/4" NPT.
2. In hard water areas – To prevent the formation of scale
on the inside of the plate DHW heat exchanger and other
components in the domestic hot water system, water with
hardness higher than 50 ppm Calcium Carbonate must be
treated with a "Water Softener" prior to entering the boiler.
Plugging of the domestic system by scaling or accumulation
of dirt is not the responsibility of Weil-McLain, and suitable
steps must be taken to avoid it.
3. The maximum domestic water pressure rating is 150 PSI
for all combi models, on the domestic pipes and internal
components.
4. A field supplied pressure relief valve that complies with
the standard for relief valves and automatic gas shut-off
devices for Hot Water Supply Systems, ANSI Z21.221
CSA4.4 - latest edition, is required to be installed at the
supply DHW connection-. This pressure relief valve
should be capable of at least the Maximum input of the
boiler model and Maximum pressure Not exceeding
*
150 PSIG. The pressure relief valve's discharge should be
per instructions in the Warning box, page 48. DO NOT
Part number 550-100-260/0520
–
80/110/150/199
(continued)
place any other type valve or shut-off device between the
relief valve and the boiler. The pressure relief valve must be
manually checked once a year to verify correct operation,
110 MBH, 150 MBH or 199 MBH, depending on the
*
boiler model).
5. Thermostatic Mixing Valve -
mixing valve for regulating domestic heating water must be
used to regulate the water temperature leaving the plate heat
NOTE:
exchanger.
water temperature of not more than 120 degrees F. It is the
responsibility of the installer to set the valve and remove or
lock the dial depending on valve capabilities.
6. Additional anti-scald devices may be installed at each hot
water faucet, bath and shower outlet.
7. DHW Filter (Installer Supplied): It is recommend to install
a 25 micron or lower domestic water filter in the cold water
line which feeds into the combi boiler for domestic hot water
production. This filter will protect the DHW flow sensor
and prolong the time between cleaning and overall life of
the brazed plate heat exchanger and flow sensor. In harsh
water conditions a finer filter and/or water softener may
be required. Consult your local water quality professional.
Check Valve – A check valve must be field provided
and installed on the outlet of the mixing valve to
prevent reverse flow. Failure to prevent the backflow
will cause water to flow through the flow switch,
activating it, when the cold water draw has ended
and the water pressure increases.
8. Drain and Isolation Valves - Install drain and isolation valves
on the inlet and outlet of the DHW connections so that
the DHW heat exchanger can be flushed and cleaned from
possible build-up caused by dirty or hard water, which is a
maintenance requirement. See page 52 for Weil-McLain's
DHW Service Valve Kit installation and Figure 125, page 137
for kit part number.
9. Cleaning – refer to the installation manual maintenance
section for the proper cleaning procedure for the plate DHW
heat exchanger, and the required cleaning frequency.
Studies have indicated that dangerous bacteria
can form in potable water distribution systems
if certain minimum water temperatures are not
maintained. Contact local health department for
more information.
This boiler is NOT intended for connection with
a refrigeration system.
B M
OILER ANUAL
An ASSE 1070 automatic
the valve must be set to supply a domestic
43