General Information - Lochinvar EGS-I&S-01 Installation & Service Manual

TEMPERATURE AND PRESSURE
RELIEF VALVE
WARNING
Keep clear of the combination temperature and
pressure relief valve discharge line outlet. The
discharge may be hot enough to cause scald injury. The
water is under pressure and may splash.For protection
against excessive temperatures and pressure, install
temperature and pressure protective equipment required
by local codes, but not less than a combination
temperature and pressure relief valve certified by a
nationally recognized testing laboratory that maintains
periodic inspection of production of listed equipment
or materials as meeting the requirements of the Standard
for Relief Valves and Automatic Gas Shutoff Devices
for Hot Water Supply Systems, ANSI Z21.22 and
the Standard CAN1-4.4 Temperature, Pressure,
Temperature and Pressure Relief Valves and Vacuum
Relief Valves. The combination temperature and
pressure relief valve must be marked with a maximum
set pressure not to exceed the maximum working
pressure of the water heater. The combination
temperature and pressure relief valve must also have an
hourly rated temperature steam BTU discharge capacity
not less than the hourly rating of the water heater. The
supplied combination temperature and pressure relief
valve, when properly installed and unrestricted, will
discharge the maximum input produced by a 240°F
(116°C) boiler supply temperature. A lower boiler
supply temperature will reduce the input required to be
discharged in the event of excessive potable water
temperatures.
Install the combination temperature and pressure relief
valve into the opening provided and marked for this
purpose on the water heater.
Some models may already be equipped or supplied with
a temperature and pressure relief valve. Verify that the
combination temperature and pressure relief valve
complies with local codes. If the temperature and
pressure relief valve does not comply with local codes,
replace it with one that does.
NOTICE
If the boiler takes longer to heat up from a cold start
than the water availability as noted above, hot water
shortage may occur.
Hot water availability is based off drawing 80% of
the heated tank volume at 4 gallons per minute flow
rate.
The maximum heat transfer through the coil (heat
input) of the water heater at 240°F boiler water supply
temperature and 210°F potable water temperature is
94,100 Btu/hr for residential models and 180,300 Btu/
hr for commercial models. Potable water temperature
is limited to below 210 °F and nominal water-
containing capacity is below 120 gallons for all single-
wall indirect models.
Accordingly, per Part HLW-101.2, Section IV of the
ASME Boiler and Pressure Vessel Code, all Lochinvar
Single-wall Indirect products are exempted from
compliance with the code.

GENERAL INFORMATION

FEATURES
This water heater contains the following features:
HEAT EXCHANGER — The heat exchanger (coil) has
1" NPT female fittings.
These water heaters with single-wall heat exchangers meets
the Uniform Plumbing Code for installation in all potable
water systems provided that:
•
The boiler water (including additives) is
practically non-toxic, having toxicity rating of
class of 1 as listed in Clinical Toxicology of
Commercial Products.
•
The boiler water pressure is limited to
maximum 30 psig by approved relief valve.
•
The heat transfer medium is potable water or
contains only substances that are recognized
as safe by the U.S. Food and Drug
Administration (FDA).
•
The pressure of the heat transfer medium is
maintained less than the normal minimum
operating pressure of the potable water system.
•
The equipment is permanently labeled to
indicate that only additives recognized as safe
by the FDA shall be used in the heat transfer
medium.
3
EGS-I&S-01