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SERVICE
SEQUENCE OF OPERATION (CONTINUED)
21 Fan Blade of M1 rotates, plenum pressure rises
22 AS1 closes, MAINS passes to 24VAC Transformer (T1)
PS (N) White → AS1 Red/White
Mains VAC
23 T1 will then supply 24VAC to MC P9(6) “proof-of-air”
Chassis Ground → MC P9(6)
Orange
24 VAC
24 AS1 closes, MAINS to Thermal Protection switch (TP)
PS (N) White → AS1 Red/White
Mains VAC
25 TP passes MAINS to Burner Blower Motor (M3) M3 Begins Operation
26
MC P2(2) monitors TACH of M3
- Tach speed can be veried via the INFORMATION ( ) >
BURNER BLOWER SPEED option. Burner blower is operating if tach speed is greater than 300 RPM.
27
Conveyor system starts. MC P6(1,2,6) delivers Phased 24VDC to
the Conveyor Motor (M4). M4 delivers Hall Effect feedback to MC
P6 (3,4,5)
M4 Begins Operation
28 MC P9(3) passes 24VAC to Ignition Module (IP-IM)
Chassis Ground → MC P9(3)(N)
24 VAC
29 MC P9(3) passes 24VAC to Optical Flame Detector (OFD) OFD Lamp Flashing Red
30 Burner system starts. IP-IM begins a pre-purge delay
IP-IM Diagnostic Lamp
FLASHING Green
31 Ignition trial, Pilot Valve (PV) terminal of IP-IM is energized
PV Blue → PV White
24 VAC
32 Immediate Spark Trial, IP-IM Spark to Pilot Burner (PB)
IP-IM Diagnostic Lamp
FLASHING Green
33
Flame detected by Optical Flame Detector (OFD). OFD sends
ame signal to IP-IM Sense Terminal
OFD Lamp Solid Red
IP-IM Diagnostic Lamp SOLID
Green
34 IP-IM MV Terminal sends 24VAC to MC P9(1)
Chassis Ground → MC P9(1)
Red/White
24 VAC
35 IP-IM MV Terminal sends 24VAC to MC P9(16)
Chassis Ground → MC P9(16)
Red/White
24 VAC
36
37
Thermocouple (TC) provides feedback to MC P11
ByPass Set-point is dened by Control System Settings
38 MC P9(2) supplies 24VAC to ByPass Valve (BPV)
Chassis Ground → MC P9(2)
Green
24 VAC
39 MC P9(9) monitors presence of 24VAC on BPV
Chassis Ground → MC P9(9)
Green
24 VAC
STEP OPERATIONS TEST POINTS
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