Heatilator CNXT70PLUS, Руководство пользователя

Страница: 22 / 31

22 Hearth & Home Technologies • CNXT70PLUS • 4034-105 Rev C • 09/05
Note: The HRV200PLUS can use indoor air instead of the
gas appliance for defrost if the optional defrost kit (part #
HRV99DEFKIT) is installed.
HRV200PLUS Defrost Mode
• The HRV200PLUS demands gas appliance operation for
defrost. This occurs when the following conditions exist:
- The appliance is not in use.
- The outdoor temperature falls below 25° F.
-
The DEFC1 jumper is not installed on the HRV200PLUS
circuit board.
• The HRV200PLUS does the following:
- Turns blowers on to high speed.
- Sends a 12VDC signal to the C2 terminal to light
the ember bed lights (by energizing relay K3 on the
appliance circuit board). This acts to notify the user
the appliance is preparing to operate.
- Positions HRV200PLUS dampers (if installed) for
appliance operations.
- Performs a 15 second delay (pre-purge) before the
burners are lit.
- Sends a 12VDC signal to the R1 terminal to initiate
the ignition sequence (by energizing relay K1 on the
circuit board).
- Sends a 12VDC signal to the C1 terminal to override
the pressure switch for the fi rst thirty seconds of
ignition.
• The CNXT70PLUS senses adequate draft in the fl ow
sensor (located in the appliance fl ue collar) to close the
fl ow pressure switch.
• The intermittent pilot ignition (IPI) system activates and
lights the burner.
• After thirty seconds, the HRV200PLUS de-energizes C1,
placing the pressure switch into the CNXT70PLUS control
circuit. The pressure switch monitors the fl ow at the fl ue
collar of the CNXT70PLUS and shuts the appliance burner
off if adequate fl ow is not present.
• When the user demand for appliance operation is
removed, the HRV200PLUS de-energizes the R1 terminal
terminating burner operation.
• There is a 20 second delay (post-purge).
• The HRV200PLUS de-energizes C1, turning the ember
bed lights off.
Note: The appliance may operate to defrost the
HRV200PLUS when the flame switch is in the “OFF”
position. The appliance will only operate in “EMBER FIRE”
mode during HRV200PLUS defrost.
The electric ember bed will light for fi fteen seconds then the
ember fi re fl ame will ignite to defrost the HRV core.