![background image](http://html2.mh-extra.com/html/york/lx-series/lx-series_owners-manual_3542844034.webp)
Page 26
Installer Setup
Dual Fuel On, Off, or External (Setup Step 50) - On -
Tells the thermostat an outdoor
temperature or a demand for third stage heat will be used to stop running the heat pump
and only run a fossil fuel source of heat.
NOTE:
Once the change to fossil fuel is made,
the heat demand
must finish with fossil fuel. Additional heat demands within 10 minutes
will also use fossil fuel, regardless of outdoor temperature.
External -
This setting
allows the use of an external fossil fuel kit. This may be a third party fossil fuel kit or
part of the heat pump control.
CAUTION - this setting will allow the heat pump and furnace to run at
the same time unless an external fossil fuel kit is properly connected.
Dual Fuel (Setup Steps 50 - 54)
This feature is for heat pump applications only.
Steps 50 - 54 will only appear if the thermostat jumper
J1
is set for
Heat Pump
and
J3
is set for
Gas Heat
.
GAS/ELEC
HEATPUMP
GAS
ELEC
RV=O
RV=B
J3
J2
J1
Jumpers are located on the
back of the thermostat
(This feature not available on all models)
(If External is chosen setup steps 51 - 54 will not have any effect.)
Lockout Aux Heat With Outdoor Temp (Setup Step 48) -
When set to ON, the Aux
Heat Lockout feature is enabled. When set to OFF, Auxiliary Heat will stage normally.
Auxiliary Heat Lockout (Setup Steps 48 -49)
This feature allows the auxiliary heat for a heat pump
(W2 and W3) to be locked out above a specific outdoor
temperature. These steps will only appear if the
thermostat jumper
J1
is set for
Heat Pump
and
J3
is set for
Electric Heat
.
Aux Heat Lockout Temp (Setup Step 49) -
(20 - 75 ) This step allows the user to set
the temperature at which Auxiliary Heat will be locked out. Adjustable from 20 to 75
degrees Fahrenheit.
GAS/ELEC
HEATPUMP
GAS
ELEC
RV=O
RV=B
J3
J2
J1
Jumpers are located on the
back of the thermostat
Lockout Heat Pump With Outdoor Temp (Setup Step 46) -
When set to ON, the Heat
Pump Lockout feature is enabled. When set to OFF, the heat pump will stage normally.
Heat Pump Lockout Temp (Setup Step 47) -
(10 - 45 ) This step allows the user to set
the temperature at which the heat pump will be locked out. Adjustable from 10 to 45
degrees Fahrenheit in five degree increments.
Lockout Heat Pump On Outdoor Temp
(Setup Steps 46 -47)
This feature stops the heat pump from running below a specified outdoor temperature,
where the heat pump has become inefficient or could damage equipment.
NOTE: This temperature setting cannot be lower than 5 degrees above
the Heat Pump Lockout temperature.
Summary of Contents for LX series
Page 2: ......
Page 4: ......
Page 6: ......
Page 8: ......
Page 53: ...Notes...
Page 54: ...Notes...
Page 55: ......