11
Installation
SNA-Series Tankless Heater
Keltech •
215-1815 Rev. B; ECN 130011
10/17/2014
Output heating capacity is reduced if these heaters are installed on 415V, 400V or 380V 3-ph .
Contact the factory to supply this information . Satisfactory performance of the heater is dependent upon a specific
flow rate vs temperature rise capability . If the desired temperature is not achieved, please verify the following:
1 . Circuit breaker is on and rated for the maximum power draw .
2 . Heater is drawing the proper current for the supply voltage on all 3 phases .
3 . All 3 phase indicator lights are lit (not flashing) indicating maximum power draw and maximum
amperage is being drawn .
4 . Flow rate and temperature rise requirements are compatible with the heater specifications .
5 . Verify there is no additional supply of cold water entering the line downstream of the heater .
TepidGuard
™
Flow Conditions
When a low flow condition (less than 15 gpm) occurs, such as operation of the eye/facewash individual elements are
energize to supply water for the eye/facewash and/or drench hose . One set of PID values is selected on the controller
for accurate temperature control at low flow conditions .
When the heater detects high flow conditions (greater than 15 gpm), all elements are energized . A second set of PID
values is selected on the controller for accurate temperature control at high flow conditions .
When the heater shuts down or switches from high to a low flow condition, the purge valve opens and purges the
heater of latent (excess) heat . This anti-scald feature works both actively at the end of each shower or passively
if sitting in an environment that may exceed the 95°F (35°C) . This TepidGuard™ system ensures safe water
temperatures at both the eyewash and shower stations .
Product Options
AL3 & AL3-SL
Temperature Alarms: Alerts you to an over or under temperature situation .
GF
(Ground Fault): Detects electrical leakage from external sources to protect equipment, electronics, and the heat
exchanger from being damaged in the event of a power fault . After turning on water, then power, test ground fault:
1 . Press GF Test button .
2 . Watch for ground fault light to illuminate and Bank Ready light(s) to shut off . The Ground Fault system is active
and in working order .
3 . Press the GF Reset button, hold for 2 seconds and release to reset ground fault .
NOTE: If a trip occurs under normal operation DO NOT RESET Ground Fault without evaluation and service.
NOTE: Normal state is Ground Fault light OFF, Bank Ready lights ON.
ENHT Freeze Protection (ENHT & ENHT30)
: ENHT offers protection to -20°F (-28°C) . The ENHT30 offers protection to
-30°F (-34°C) . Each level of protection utilizes the normal heater supply voltage . No additional dedicated circuit to the unit
is required during field installation . Freeze protection (ENHT option) includes an internally insulated NEMA 4/4X enclosure
and thermostatically controlled forced air heater to maintain internal temperatures above freezing . ENHT options also
include a connection point for DCS monitoring . In the event of a power interruption or ENHT system failure when internal
enclosure temperatures reach 40°F (4 .4°C) or lower, the unit will notify a facilities control/monitoring system that the unit is
unable to maintain freeze protection . Regardless of state of power to the unit, this warning notifies maintenance personnel
and provides an opportunity to correct the condition before any damage occurs to the unit .
NOTE: With this option, three phase power must be continuously applied to the heater for the internal freeze protection
heater to operate properly and provide protection. If three phase power cannot be continuously applied, the heat
exchanger must be completely drained of water and electrically locked out or damage from freezing may occur.
Use Start Up procedure to restart this equipment. This option does not require a separate electrical circuit.
WARNING! Failure to maintain power at all times may result in damage to the heater and void the warranty.
Please utilize the temperature sensor contacts (N.O.) that can provide a signal to a remote
device, DCS monitoring or BMS (Building Management System) signal. When temperature inside
the cabinet drops below 40°F (4°C) operation of the system should be verified.
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