71
Rev. 2
SERVICING
SECTION INDEX
S-1 Checking Voltage
72
S-2 Checking Wiring
72
S-3 Checking Thermostat, Wiring, and Anticipator
72-73
S-4 Checking Transformer and Control Circuit
73
S-5 Checking Primary Limit Control
73-75
S-6 Checking Auxiliary Limit Control
75-76
S-7 Checking Flame Rollout Control
76
S-8 Checking Pressure Control
76-79
S-9 Checking Air Circulation Blower Motor
or Induced Draft Blower Motor
79
S-9A ECM Motor Interface Board
80
S-10 Checking Capacitor
80
S-10A Resistance Check
80-81
S-10B Capacitance Check
81
S-11 Checking Gas Valve
81
S-12 Checking Hot Surface Ignitor
81
S-13 Checking White-Rodgers 50A50 or 50A51
and Heatcraft HSI 1-1A or HSI-2 Ignition Control
81-82
S-13A Checking White-Rodgers 50A52 Ignition Control
82-83
S-14 Checking Flame Sensor
83
S-14A Checking Radiant Flame Sensor
84
S-15 Checking Main Burners
84
S-16 Checking Orifices
85
S-17 High Altitude Application (USA)
85
S-18 Checking Gas Pressure
86-88
S-19 Checking for Delayed Ignition
88
S-20 Checking for Flashback
88
S-21 Checking Duct Static
89
S-22 Checking Temperature Rise
89
