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Installation
Special Installation and Operating Instructions
Tankless Water Heaters With Optional Class I Division 2 Purge EXP2 Option
General Information
All Bradley Tankless Water Heaters powered by Keltch with a model number suffix of – EXP2 have been fitted
with a Z purge system to pressurize the enclosure suitable for use in Class I Division 2 Hazardous Locations .
A Continuous Flow (Model CF) Mini-Z Pressurizing System has been fitted to the bottom of the enclosure .
2
4
EXP2 Installation Notes
1 . Any tubing, conduit or fittings connected to the Pressurized Enclosure (PE) must conform to local codes for
flammability ratings .
2 . All egress into PE must be plugged and properly sealed to minimize leakage of purge air . Use hazardous
location sealing fittings suitable for Class I locations within 18" (458 mm) of enclosure .
3 . The EXP2 purge system option is a continuous flow purge system and is calibrated to flow at 0 .9 SCFM
(1 .5291 CMH) . To minimize waste, plug and seal all openings and conduit . The externally mounted purge
system is rated to -4°F (-20°C) .
4 . The system is designed for use primarily with compressed air . The source of the compressed air must
be from a non-classified area (see Purge Gas Supply Notes) . Purge air must be clean, dry and free of
flammable gases . When inert compressed gases are used (Nitrogen, for example) the installer and facility
manager must take suitable precautions on-site so that buildup of the inert gas does not present a health
hazard . Where risk of asphyxiation exists, a warning label must be fitted to the Pressurized Enclosure
(PE) .
5 . Adjustment of Purge System is not necessary . System is fully calibrated .
6 . Connect to Purge System where indicated . Connection port is 1/4" NPT female . Supply pressure must be
regulated to 60–115 psi (4-8 bar) .
Bradley • 215-1822 Rev. D
System Relief
R
1
2
3
4
5
Conduit Hub
Class I Div . 2
supplied by others
1
5"
(127)
18"
(458)
5
Max
Explosion proof
sealing fitting
supplied by others
Suggested region for power
1
entrance . Entrance hole and
Purge
components to be provided by
installer .
Valve
Purge Control Panel
2
Class I Division 2
All installation egress from
3
panel must be sealed (electrical
conduit) for proper explosion proof
installation .
Spark arrestor with calibration
4
orifice is located behind the purge
control unit and through the
bottom of the enclosure .
Purge gas/compressed air inlet
5
fitting here .
1/10/2022
CLE Series Tankless Heater
(mm)
15
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