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2. The contactor closes immediately upon receiving the 24-volt signal, causing the compressor and condenser fan motors to start. 3. The 24-volt signal is also sent to pin 1 of the 5-pin thermostat harness, initiating a 5-second circulating air blower “on” delay. 4. After the 5-second delay, the ignition control energizes the cooling speed relay and the circulating air blower starts. 5. When the cooling call is satisfied, the thermostat interrupts the R, Y and G circuit. The contactor de-energizes immediately, causing the compressor and the condenser fan to stop. The ignition control starts a 90-second circulating air blower “off” delay. SRM-HW/ Service Reference Manual 6. After the 90-second delay, the ignition control de- energizes the cooling speed relay and the circulating air blower stops. FAN ON 1. When the thermostat is switched to the “FAN ON” position, the R-G circuit sends a 24-volt signal to pin 4 of the 5-pin thermostat harness. 2. The 24-volt signal energizes the cooling speed relay, sending L1 power to the ACB COOL terminal of the ignition control. 3. L1 power is sent to the circulating air blower terminal block, causing the circulating air blower to run in cooling speed. 4. The circulating air blower continues to run in cooling speed until the thermostat is switched to “AUTO”, interrupting the R-G circuit. Note: With the thermostat in the “FAN ON” position during heat call, ignition control will not energize the heat speed relay. The circulating air blower continues to run in cooling speed unless the limit switch circuit opens, which would cause the heat speed relay and the induced draft blower relay to become energized. This would de-energize the cooling speed relay until either the limit switch circuit is closed or the thermostat is switched to the “AUTO” position. SEQUENCE OF OPERATIONS SRM-HW/HWC 2/99 SPECIFICATIONS Magic-Pak: HW/HWC HW (Heating Only) (w/United Technologies 1097 Spark Ignition System) #45008-2 HIGH (BLACK)64HW MED (BLUE)51HW HIGH (BLACK)38HW LOW (RED)LOW (RED)26HW HEATINGHEATINGMODELS EVAP.MOTORSPEED CONNECTIONSEVAP. MOTOR SPEED CONNECTIONS GREEN M ORANGEORANGE VOILET VOILET RED BLUE WHT RED BLACK BLUE YELLOW WHITEGREENRED FLAME ROD ELECTRODE 4 5 6 321 RGWCY BLACK BLACK BLACK GAS VALVE MANUAL RESET LIMIT SWITCH COMBUSTION BLOWER BLACK BLUEYELLOWRED 208 V RED BLUE 240 V CAPACITORCAPACITOR BLOWER 208/230-1-60 POWER SUPPLY COPPER CONDUCTORS ONLY} THERMOSTAT} BLACKBLACK RED YELLOW RED BLUE BLACK BROWN W Y G R W Y G R GND 24VAC UNUSEDHEATCOOLL1CNB L SEE CHART FOR WIRING PRESSURESWITCH AUTO RESET LIMIT SWITCH IGNITION CONTROL BLOWER MOTOR CONNECTOR BLOCK WIRE NUT TERMINAL BLOCK CIRCUITS ENERGIZED OPERATING MODE CIRCUIT HEATING R-W COOLING R-G-Y FAN R-G LINE VOLTAGE-FACTORY LINE VOLTAGE-FACTORY WHEN USED LINE VOLTAGE-FIELD LOW VOLTAGE-FACTORY LOW VOLTAGE-FIELD NOTE: IF ANY OF THE ORIGINAL WIRES ARE REPLACED, THE SAME SIZE AND TYPE WIRE MUST BE USED. YELLOW TRANSFORMER ORANGE H 1 2 3 4 5 DIAGNOSTICS The following blower/ignition control board LED codes will indicate normal or abnormal operations: SLOW FLASH Normal Operation, No Call for Heat FAST FLASH Normal Operation, Call for Heat 2 FLASH System Lockout -Failed to Detect or Sustain Flame 3 FLASH Pressure Switch Open or Closed 4 FLASH High Limit or Rollout Switch Open 5 FLASH Flame Sensed and Gas Valve Not Energized STEADY Internal Failure (Micro-controller Failure; Self-check) FIGURE 2-2 Connection Diagram SRM-HW/ Service Reference Manual SEQUENCE OF OPERATIONS Simplified Sequence - HW (w/UTEC 1097 Board) Refer to Figure 2-2 CALL FOR HEAT 1. The indoor thermostat energizes the R-W circuit, sending a 24-volt signal to the ignition control. 2. The 24-volt signal causes the induced draft blower to start, which closes the pressure switch. 3. Once the pressure switch closes, a 30-second induced draft blower pre-purge starts. 4. After the 30-second induced draft blower pre-purge, the gas valve opens and the burners ignite. This starts a 30-second circulating air blower “on” delay. 5. The unit continues to operate in the heat mode until the indoor thermostat setting is reached. At that time, the R-W circuit is interrupted. 6. The 24-volt signal to the ignition control is interrupted, causing the gas valve to close and the burners to shut down. 7. A 5-second post-purge starts and following that the induced draft blower stops. 8. A 120-second circulating air blower “off” delay starts. After the elapsed time, the circulating air blower stops. FAN ON 1. When the thermostat is switched to the “FAN ON” position, a 24-volt signal is sent to the ignition control. 2. The ignition control immediately energizes the cooling speed of the circulating air blower. 3. The circulating air blower runs in the cooling speed until the thermostat fan switch is moved back to the “AUTO” position. At this time, the circulating air blower stops. During the call for “FAN ON”, the circulating air blower heat speed will not be energized by the ignition control unl...

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