A
HE, DE & RE MANUAL
IOM-26
16 of 33
Oct 12 R4
7. Refer to the unit function and wiring diagram provided for the lighting interlock of the served space
during heater operation in the bake cycle mode.
8. For Non Re-circulating applications, all air to this unit must be drawn directly from the outdoors.
EXHAUST FAN / RELIEF AIR PROVISIONS
Adequate relief shall be provided so as to prevent building over-pressurization when the ventilation system
is operating at its full rated capacity. This can be accomplished by interlocking a powered exhaust system;
by providing properly sized relief openings; or by taking into account, through standard engineering
methods, the structure’s designed infiltration rate; or by a combination of these methods.
LOW LIMIT FREEZE PROTECTION
If an optional low-temperature control system (low limit) is not an integral part of the heater, it is
recommended that a low limit control be installed if this unit is being installed a geographic area subject to
freezing temperatures. The low limit can provide freeze-up protection in the event of burner shutdown.
ELECTRICAL INSTALLATION
DO NOT install anything that will interfere with equipment access or the rating plate.
The unit must be electrically grounded and all wiring must be installed in accordance with the National
Electrical Code, ANSI/NFPA 70, and/or the Canadian Electric Code CSA 22-1 and to the approval of the
authorities having jurisdiction.
THE FLOOR OF THE UNIT HAS BEEN MADE WATER-RESISTANT. DO
NOT CUT OR DRILL HOLES IN THE FLOOR OR USE PENETRATING FASTENERS.
Field wiring
diagrams, internal wiring diagrams and operating functions are included in the control cabinet. The power
requirements are indicated on the rating plate. Where field wiring of control circuits is required, take care to
size the field wiring for a maximum 10% voltage drop. The control circuit ampacity is noted on the field
wiring diagram. See the field wiring diagram for requirements for shielded or twisted pair wire for solid state
devices.
Caution:
Temporary Power Generation
The warranty will be void if the voltage being fed from any temporary
generator is not within 10% of the nominal rated nameplate voltage and
voltage imbalance shall be limited to 2%. A power monitor shall be installed
by others to properly monitor power quality and conditions.
All generator sets shall be provided with overcurrent and earth-fault
protection. The protective apparatus should be capable of interrupting,
without damage, any short-circuit current that may occur.
Warning:
No unspecified external load shall be added to the control transformer
circuit(s) or to the main power circuit(s).
