NOTE: A grounding electrode conductor shall be used to connect the equipment grounding conductors, the equipment enclosures, and the grounded service conductor to the grounding electrode.
Field Wiring Connection
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause im- proper and dangerous operation. Verify proper operation after servicing.
DANGER: SHOCK HAZARD
Make sure electrical power to the heater is discon- nected to avoid potential serious injury or damage to components.
HIGH VOLTAGE
WIRING
Fig. 21: High Voltage Wiring Location
LOCATOR DIMPLES
FOR OPTIONAL
COMPONENTS
Fig. 22: Locator Dimples for Optional Components
Venting
CAUTION: Proper installation of flue venting is critical for the safe and efficient operation of the heater.
General
Appliance Categories
Heaters are divided into four categories based on the pressure produced in the exhaust and the likelihood of condensate production in the vent.
Category I – A heater which operates with a
Category II – A heater which operates with a
Category III – A heater which operates with a positive vent pressure and with a vent gas temperature that avoids excessive condensate production in the vent.
Category IV – A heater which operates with a positive vent pressure and with a vent gas temperature that may cause excessive condensate production in the vent.
See Table K for appliance category requirements.
NOTE: For additional information on appliance categorization, see appropriate ANSI Z21 Standard and the NFGC (U.S.), or B149 (Canada), or applicable provisions of local building codes.
CAUTION: Condensate drains for the vent piping are required for installations of the MVB. Follow vent manufacturer instructions for installation and location of condensate drains in the vent. Condensate drain must be primed with water to prevent gas flue leak and must be routed to an appropriate container for neutralization before disposal, as required by local codes.
WARNING: Contact the manufacturer of the vent material if there is any question about the appliance categorization and suitability of a vent material for application on a Category III or IV vent system. Using improper venting materials can result in personal injury, death or property damage.
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