13
Installation
CNA-Series Tankless Heater
Keltech •
215-1814 Rev. C; ECN 150010
7/13/2015
Product Options
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 .
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 .
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 install these options properly, to maintain power at all times or to connect the contacts
provided on ENHT heaters correctly to the BMS 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 when temperature inside the cabinet drops below 40°F (4°C) and be aware of
freezing conditions in your area (Reference Schematic). The contacts will open and notify you that
the operations of the system should be verified.
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 .
T170, T180 & T190 High Temperature Options:
Reach and maintain temperatures as high as 190°F .
D1 Control Interface:
Provides 4–20ma communication interface with temperature controller .
TE & TE2 Corrosive Fluid Protection:
The TE option is a PFA Teflon
®
coated heat exchanger with bright annealed
stainless steel elements,FDA Approved (Use for deionized water or mild corrosive fluid applications) . Similar to TE,
the TE2 option is a single layer of Xylan Fluoropolymeric coated heat exchanger with bright annealed stainless steel
elements, FDA Approved for Food Contact (Use in deionized water applications) .
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 .
HLW (ASME Certified Heat Exchanger):
Available on CNA-63 and larger . The heat exchanger is made of special
brass and certified by ASME inspector for quality of workmanship .
N4X (NEMA 4X Enclosure):
Corrosion resistant enclosure made of stainless steel and ideal for harsh environments .
If a trip occurs under normal operation DO NOT RESET Ground Fault without evaluation and service.
Normal state is Ground Fault light OFF, Bank Ready lights ON.