BOCK LCE20 Installation And Operation Instruction Manual - Page 6

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SECTION II: GENERAL INFORMATION

OVERVIEW
This manual covers single and dual element commercial electric water heaters. Single
element models are wired for connection to a single phase branch circuit, have a maximum
thermostat setting of 170°F, and are UL listed to UL 174. Dual element models are wired for
connection to a three phase delta branch circuit and will operate in an "unbalanced" fashion.
Dual element models are factory wired for non-simultaneous operation, have a maximum
thermostat setting of 181°F, and are UL listed to UL 1453.
WATER TREATMENT & FILTRATION
In areas where poor water conditions are suspected (i.e. lime, iron, and other minerals), it
is essential that the water be tested and appropriate action taken to prevent damage to the
water heater and ensure the quality of the water.
TEMPERATURE CONTROL
Single element models are equipped with an adjustable, surface-mounted thermostat
(125°F - 170°F) and fixed high limit (190°F). The thermostat is factory set to 125°F.
Dual element models are equipped with adjustable, surface-mounted thermostats
(135°F - 181°F) and fixed high limits (200°F). Both thermostats are factory set to 135°F.
Bock recommends a thermostatic mixing valve be installed and used according to the
manufacturer's directions to prevent scalding. Many state and local codes now require
installation of these devices. Point of use temperature may be hotter than the setting on the
water heater thermostat. The mixing valve will ensure potable water temperatures at the
desired set point with a higher degree of accuracy.
Table 4: Scald Temperature/Time Relationships
APPROXIMATE
TEMPERATURE/TIME
RELATIONSHIPS TO
SCALDING
1 20 °F
125°F
130°F
°F
135
140°F
145°F
150°F
155°F
Page 6
CAUTION: Hot water in excess of 120°F can cause scalding!
More than 5 minutes
1
⁄
to 2 minutes
1
2
About 30 seconds
About 10 seconds
Less than 5 seconds
Less than 3 seconds
About 1
⁄
seconds
1
2
About 1 second