WTGO Boiler Manual

Part number 550-141-825/1211
23
GOLD
WTGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect tankless heater piping
Limit Control with
Tankless Control
Automatic Mixing
Valve
Flow Regulating
Valve
Cold Water
Supply
12" min.
Cold
Hot
Mixed
Figure 16 Tankless heater piping
Boiler
model
number
Heater
number
Intermittent
draw
ratings
(gpm)*
Inlet
and outlet
tapping
sizes
WTGO-3 WT-14 3.25 ½"
WTGO-4 WT-14 3.75 ½"
WTGO-5 WT-14 4.00 ½"
WTGO-6 WT-14 4.25 ½"
WTGO-7 WT-20 5.50 ½"
WTGO-8 WT-20 5.75 ½"
WTGO-9 WT-20 6.00 ½"
* Gallons of water per minute heated from 40°F to
140°F with 200°F boiler water temperature. Tested
in accordance with I=W=H Testing and Rating
Standard for Indirect Tankless Water Heaters
Tested with Boilers.
Table 5 Tankless heater ratings
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 Com-
mercial Products.
• Boiler water pressure is limited to max. 30 psig by approved water
relief valve.
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.
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 sanitiz-
ing needs will scald and cause injury.
• Children, elderly, infirm or physically handi-
capped 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.
To pipe tankless heater:
1. Size piping no smaller than tankless heater inlet and outlet.
2. Following controls (furnished by others) must be installed:
a. Automatic mixing valve. See Figure 16.
b. Flow regulating valve. Size according to intermittent draw of tank-
less heater. See Table at right. Follow valve manufacturer’s instruc-
tions 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