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SiUS331708EA
Outline of Control (Indoor Unit)
Functions and Control
82
6.13 Gas Furnace Control (CXTQ-TA Models)
Outline
When conditions for gas furnace operation are established, the system transits into the standby
mode for pre-gas furnace operation. In this status, heating operation is not performed with either
heat pump or gas furnace. Afterward when the system transits into gas furnace operation, CXTQ
requires the gas furnace combustion heating.
Detail
∗
1. Time is up in factory setting.
∗
2.
E0
,
E1
,
E2
,
E7
,
EC
,
Ed
are subject to the abnormality among error codes displayed on the PCB of the
gas furnace.
∗
3. These conditions are not established until heat pump prohibition time elapsed after entering the
standby mode for pre-gas furnace operation (except for the case where the condition has been
established when entering the standby mode for pre-gas furnace operation).
Refer to field setting 11(21)-3 for the heat pump prohibition duration.
∗
4. Refer to
Gas Furnace Operation Prohibition
on page 58 for details.
∗
5. Refer to item 14 Switch over ambient setting on
Setting Mode 2
∗
6. Refer to
Gas Furnace Operation Startup Prohibition
• Thermostat Step 1: ON
• CXTQ is during heat pump operation
• Not during defrost/oil return operation
• Thermostat Step 2: ON
• Gas furnace operation requiring signal (from outdoor unit): ON (
∗
5)
• Field setting 11(21)-3: 07, 09, 11
• During defrost/oil return operation
• Thermostat Step 1: OFF
Thermostat OFF
Thermostat ON
Heat pump operation
OR
OR
OR
&
&
&
&
&
• Hot-water heater signal (from outdoor unit): ON
• Compressor is suspended
• Operation mode: heating
• Gas furnace operation prohibition signal (from outdoor unit): OFF (
∗
4)
• Outdoor unit supports simultaneous operation of heat pump and gas
furnace
• Time of timer A is up (
∗
1)
• No error code (
Ed
) is displayed on PCB of gas furnace
• Filed setting 11(21)-3: 01, 03, 05
• During defrost/oil return operation
OR
OR
OR
&
&
&
• Hot-water heater signal (from outdoor unit): OFF
• Compressor is operating
• Operation is not in heating
• Gas furnace operation prohibition signal (from outdoor unit): ON (
∗
4)
• Outdoor unit does not support simultaneous operation of heat pump
and gas furnace
Pre-gas furnace
operation standby
Gas furnace operation
Timer A
55 minutes timer starts.
• Gas furnace startup
prohibition signal
(from outdoor unit):
OFF (
∗
6)
• Gas furnace abnormality continues
for 5 minutes or more (
∗
2)
• Hot-water heater signal (from
outdoor unit): OFF
• Thermostat Step 2: OFF (
∗
3)
• Gas furnace operation requiring signal (from outdoor unit): OFF (
∗
3) (
∗
5)
• Not during defrost/oil return operation or preparation
Summary of Contents for RXSQ24TAVJU
Page 1: ...Service Manual SiUS331708EA RXSQ24 36 48 60TAVJU Heat Pump 60 Hz...
Page 290: ...Wiring Diagrams SiUS331708EA 277 Appendix RXSQ48TAVJU 3D109546A...
Page 291: ...SiUS331708EA Wiring Diagrams Appendix 278 RXSQ60TAVJU 3D109547A...
Page 295: ...SiUS331708EA Wiring Diagrams Appendix 282 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 298: ...Wiring Diagrams SiUS331708EA 285 Appendix FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 300: ...Wiring Diagrams SiUS331708EA 287 Appendix FXSQ05 07 09 12 15 18 24 30 36 48 54TAVJU 3D110467B...
Page 301: ...SiUS331708EA Wiring Diagrams Appendix 288 FXMQ07 09 12 15 18 24 30 36 48 54PBVJU 3D093209B...
Page 302: ...Wiring Diagrams SiUS331708EA 289 Appendix FXHQ12 24 36MVJU 3D048116C...
Page 303: ...SiUS331708EA Wiring Diagrams Appendix 290 FXAQ07 09 12 18 24PVJU 3D075354C...
Page 309: ...SiUS331708EA Wiring Diagrams Appendix 296 VAM1200GVJU 3D073270D...