Weil-McLain GOLD CGt Manual page 26

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4e
Water piping — connect tankless heater
To pipe tankless heater:
1. Size piping no smaller than tankless heater inlet and outlet.
. The following controls (furnished by others) must be installed:
a. Automatic mixing valve see Figure . See
b. Flow regulating valve. Size according to intermittent draw of tan-
kless heater. See Table 6. Follow valve manufacturer's instructions
to install.
3. Additional anti-scald devices may be installed at each hot water faucet,
bath and shower outlet.
4. In hard water areas, soften cold domestic supply water to heaters to
prevent lime build-up.
To set tankless heater low limit:
1. Adjust setpoint dial to 190°F - 00°F. The boiler high limit should be
set 0°F higher.
Studies have indicated that dangerous bacteria can form
in potable water distribution system if certain minimum
water temperatures are not maintained. Contact local
health department for more information.
These single wall heat exchangers comply with National
Standard Plumbing Code provided that:
• Boiler water (including additives) is practically non-
toxic, having a toxicity rating or class of 1, as listed
in Clinical Toxicology of Commercial Products.
• Boiler water pressure is limited to maximum 30 psig
by approved water relief valve.
If boiler is installed in a closet, it is recommended to
insulate the supply piping of domestic hot water to
lower closet air temperature.
6
Hot Water Can Scald!
• 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 scaled 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.
Protection Must Be Taken Against Excessive Temperature and Pressure! — In-
stallation of a Temperature & Pressure (T&P) relief valve is required.
DANGER above.
Table 6 Tankless heater rating table
Figure 22 Tankless heater piping
Part Number 550-110-290/0107