Tepidguard; Flow Conditions; Product Options - Bradley Keltech SNA Série Manuel D'installation

Installation

TepidGuard

™
When a low flow condition (less than 15 gpm/56 .8 lpm) occurs, such as operation of the eye/facewash, individual
elements are energized 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/56 .8 lpm), 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 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: The AL3 option provides dry contacts that open to signal flow >1 .5 gpm
(5 .7lpm) has activated the heater . The AL3-SL option provides these dry contacts and additionally activates a local
audible and visual alarm on the heater .
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°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 .
NOTICE! 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.
NOTICE! 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.
EXP2CFPM (Continuous Flow Explosion Proof Purge System): Keltech's EXP2CFPM option makes heaters
compliant for classified areas: Class I Division 2, Groups A, B, C, D, Temp Code: T5 . The Purge System requires a
supply of clean instrument air or inert gas (provided by installer) . This supply maintains a positive internal pressure
and prevents the enclosure from filling with flammable gasses, dusts or vapors from the ambient environment .
Complete installation provided in this manual .
FDS Fused Disconnect: Internal fused disconnect interlocks with enclosure door when energized, prohibiting access
to a live cabinet . Select the FDS option for an additional level of safety and convenience at the heater location .
HLW (ASME Certified Heat Exchanger): Available on SNA-63 and larger . The heat Exchanger is made of special
brass and certified by ASME inspector for quality of workmanship .
N4X (NEMA 4X): Corrosion resistant enclosure made of stainless steel and ideal for harsh environments .
Bradley • 215-1815 Rev. E; ECN 16-17-016

Flow Conditions

SNA-Series Tankless Heater
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