Chapter 1: Functional Description
System Functions
Service Manual 1-19
1.3.13 Heat Control
System runs in one of three modes: Warmup Mode (refer to 1.3.13.1), Manual Mode (refer to 1.3.13.2), and
Baby Mode (refer to 1.3.13.3. Refer to Figure 1-14 and Figure 1-15.
1.3.13.1 Warmup Mode
During Warmup Mode “Check Baby” alarms are deactivated. If you do not press the “Admit Baby” key
during the first minutes after start up, the display will show “Warming...” and the radiant heater will
automatically run at 100% power. After 7 minutes, the display indicates “Warmup Complete…” and the
default heater power setting drops to 50%. The display continues to flash “Admit Baby” until you press the
“Admit Baby” key and start normal operation.
1.3.13.2 Manual Mode (assuming normal run-state, no alarms)
The user set point is heater output level from 0% to 100% in 5% increments. The main application software
passes the set point to the heat control processor. System input to the heat control processor also includes
heater calibration data from the EEPROM chip in the heat engine assembly. The heat control processor
modulates, in ½ line cycles, the power to the heater with a solid-state relay to achieve the desired power
output. Power to the heater is monitored with a solid-state power meter to ensure the proper power is
being delivered.
FIGURE 1-13. Procedure Light
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