Cooling Mode, Heat Pump Heating | Carrier 50JZ 024-060 instruction

(2.) COOLING MODE—

Press MODE button on the Thermidistat™ until COOL icon is displayed. Cooling begins within 10 sec. and remains on for 4 minutes. Observe that compressor, outdoor fan and indoor blower motors start after the call for Cooling. At the end of 4 minutes, the cooling cycle stops and the MODE reverts back to OFF. The Indoor Blower continues to run for the time selected on the Easy Select™ board after OFF icon is displayed.

(3.) HEAT PUMP HEATING—

Press MODE button on the Thermidistat™ until HEAT icon is displayed. Heat pump heating begins within 10 sec. and remains on for 4 minutes. Observe that the compres- sor, outdoor fan and indoor blower come on. At the end of the 4 minutes, heating cycle stops and the MODE reverts back to OFF. The indoor blower continues to run for the time selected on the Easy Select™ Board after the OFF icon is displayed. Heating maybe turned off anytime during the 4 minute cycle by pressing MODE button until OFF is displayed.

(4.) GAS HEAT MODE—

Press MODE button until E-HEAT(Emergency Heat or Back-Up Heat) icon is displayed. Gas heating begins within 10 sec. and remains on for 4 minutes. The induced draft motor should start immediately. The burners should light within 5 sec. of E-HEATcall. The indoor blower will turn on 45 sec. after the flame has been established. Gas heating stops at the end of 4 minutes and MODE reverts back to OFF. The indoor blower continues to run for the time selected on the Easy Select™ Board after the OFF icon is displayed.

NOTE: If the burners do not light, this lighting sequence is repeated for 15 minutes from the initial call for E-HEAT.If after 15 minutes the burners do not light, there will be a lockout. To reset the burner lockout control, break the 24-v. power to “W”.

(5.) AUTOMATIC CHANGE-OVER—

To test AUTO CHANGE-OVERfunction between COOL and HEAT:

Enable the AUTO CHANGE-OVERmode during Thermi- distat™ set-up. Refer to the Thermidistat™ literature for details. Observe that the unit operates in cooling when in COOL MODE (when setting is below room temperature) and HEAT MODE (when setting is above room tempera- ture).

AIRFLOW AND TEMPERATURE RISE-The heating section for each size unit is designed and approved for heating operation within the temperature rise range stamped on the unit rating plate. Table 15 shows the approved temperature rise range for each heating input, and the air delivery (CFM) at various temperature rise ranges.

The heating operation airflow must produce a temperature rise that falls with in the approved range.

Refer to Indoor Airflow and Airflow Tables on the following pages to adjust heating airflow when required.

Step 3—50GL: Start-Up (ICM FIOP)

CHECKING COOLING CONTROL OPERATION–Start and check the unit for proper cooling control operation as follows:

(1.) Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and shuts down when FAN switch is placed in AUTO position.

(2.) Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below room tem-

perature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycle shuts down when control setting is satisfied. The evapo- rator fan will continue to run for the selected off delay.

(3.) When using an auto-changeover room thermostat, place both SYSTEM and FAN switches in AUTO positions. Observe that unit operates in heating mode when tempera- ture control is set to ‘‘call for heating’’ (above room temperature) and operates in cooling mode when tempera- ture control is set to ‘‘call for cooling’’ (below room temperature).

NOTE: Once the compressor has started and then has stopped, it will not start again until 5 minutes have elapsed. (The cooling cycle remains ‘‘on’’ until the room temperature drops to point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat ‘‘breaks’’ the circuit between ther- mostat terminal R to terminals Y and G.) These open circuits de-energize contactor coil C and ICM board. The condenser and compressor motors stop. After the time delay setting selected on the Easy Select™ board (See Easy Select Section) , the blower motor stops. The unit is in a ‘‘standby’’ condition, waiting for the next ‘‘call for cooling’’ from the room thermostat.

Step 4—50JZ: Start-Up (ICM FIOP)

CHECKING COOLING AND HEATING CONTROL OPERA- TION– Start and check the unit for proper control operation as follows:

(1.) Place room thermostat SYSTEM switch or MODE control in OFF position. Observe that blower motor starts when FAN mode is placed in FAN ON position and shuts down according to time delay selected on the Easy Select™ board (See Easy Select Section) when FAN MODE switch is placed in AUTO position.

(2.) Thermostat:

When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat ter- minal R to terminals Y, O and G. These completed circuits through the thermostat connect contactor coil (C) (through unit wire Y) and ICM board (through unit wire G) across the 24-v. secondary of transformer (TRAN).

Thermidistat™ or Thermostat and Humidistat:

When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat ter- minal R to terminals Y, O, DH, and G. These completed circuits through the thermostat connect contactor coil (C) (through unit wire Y) and ICM board (though unit wire G) across the 24-v. secondary of transformer (TRANS).

(3.) Place system switch or MODE control in HEAT position. Set control above room temperature. Observe that com- pressor, outdoor fan, and indoor blower motors start. Observe that heating cycle shuts down according to time delay selected on the Easy Select™ board (See Easy Select Section) when control setting is satisfied.

(4.) When using an automatic changeover room thermostat, place both SYSTEM or MODE control and FAN mode switches in AUTO positions. Observe that unit operates in Cooling mode when temperature control is set to “call for Cooling” (below room temperature), and unit operates in Heating mode when temperature control is set to “call for Heating” (above room temperature).

NOTE: Once the compressor has started and then has stopped, it should not be started again until 5 minutes have elapsed. The

48JZ (N) 024-060, 50JZ 024-060, 48GP (N) 024-060, 50GL 024-060 specifications

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Carrier 50JZ 024-060 Cooling Mode, Heat Pump Heating, GAS Heat Mode, Automatic CHANGE-OVER

Models: 48JZ (N) 024-060 50JZ 024-060 48GP (N) 024-060 50GL 024-060