Laars Mighty Max VW Series, Инструкции по установке, эксплуатации и обслуживанию

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Mighty Max Volume Water Heater
Page 15
2K-4. Combustion Air Piping
Run piping of the appropriate size between the
air intake terminal and the heater (see Table 7). Table
9 lists the materials for piping the heater.
Term Description
Pipe Single-wall galvanized steel pipe,
24 gauge minimum.
Joint Sealing Permanent duct tape or aluminum
tape
Insulation Not required, but recommend R5
insulation for cold installations
(consult American Society of
Heating, Refrigerating, and
Air Conditioning Engineers
(ASHRAE) handbook
Table 9. Required Combustion Air Piping Material.
2L. Electrical Wiring
WARNING
Electrically ground the heater in accordance with the
latest edition of ANSI/NFPA 70. In
Canada, use
CSA C22.1. Do not rely on the gas or water piping to
ground the metal parts of the heater. Often, plastic
pipe or dielectric unions isolate the heater
electrically. Service and maintenance personnel who
work on or around the heater may be standing on
wet floors and could be electrocuted by an un-
grounded heater.
1. Check heater wiring and pump for correct
voltage, frequency, and phase.
2. Wire the heater and pump exactly as shown in
the wiring diagram supplied with the heater (see
Figure 11).
3. Electrically interlock the pump and heater so the
heater cannot come on unless the pump is
running.
4. Connect all field-installed devices (relays,
timers, temperature devices, etc.) to the heater
wiring at points labeled “Field Interlock” (see
Figure 11).
Boiler Size Assembly Number
320 20258101
400 20258102
520 20258103
625 20258104
775 20258105
1000 20258106
Table 8. Combustion Air Assembly.
Figure 10. Ducted Combustion Air Conversion.
Ducted Combustion
Air Pipe
Inlet
Pipe
Adapter
Plate
Louvered
Plate