Boiler Operational Sequence; Lcd Display - Thermal Solutions EVCA SERIES Installation, Operating And Service Instructions

VI. Boiler Operational Sequence
Product Features
Boiler Sequence
BOILER STATE

LCD Display

Parameter / Notes
Boiler Disable or Remote On/Off
Outdoor Air Temp >
Warm Weather Shutdown Setpoint
Domestic Hot Water Priority
Low Fire Hold
Fuel Valve Energized
Flame Safeguard Alarm
System Pump Feedback
Call For Heat
Recycling Limits
( LC, OO, WF , GP and HL inputs )
Non-Recycling Limits
(Combustion Air Flow (CA Input))
Call For Heat Relay
Lockout Indicator
(Manual Reset Required)
Spare Output
System Pump
System Pump Backup Pump
Combustion Air Damper
System Alarm
Mixing Valve Output
Blower High Speed
Blower 0 Volts
Notes
a. Boiler Pump is "On" when the Boiler Pump is set to "On Always" or the boiler is lead boiler and Boiler Pump is set to "On Lead".
b. Boiler Pump is "On" when the Boiler Pump is set to "On Always" and WWSD is set to "WWSD of System Pump" or "Off".
c. System Pump is "On" when the System Pump is set to "yes" and WWSD is set to either "WWSD of Boiler" or "Off".
d. Boiler pump is "On" during Prepurge and Post Purge when Boiler Pump is set to "Purge" or boiler is lead & Boiler Pump is set to "On Lead".
e. Combustion Air Damper Spare Output is maintained "On" for 2 minutes after the Call For Heat is removed.
f. Modulation rate is held at purge % when low fire input is not provided.
Sage Boiler Control Instruction Manual
Pre-Sequence States
a
RO
-
44,30,
O+,O-
75
DP
20,74
SI
9
CS
-
AL
-
SI
9
70,71,
R+,R-
OR
72
B O, B C
8,27,
LC, OO ,WF,
GP ,HL 28
CA -
CH
-
LO
-
VI
-
Boiler Pump
BP
2,30
SP
25,30
SO
10
10,27/
SO
e
SO
10
6,79,
MS,MR
80
V+,V-,
49
P+,P-
V+,V-,
Purge %
52
P+,P-
V+,V-,
Modulation
-
P+,P-
V+,V-,
Low Fire %
9,51/f
P+,P-
V+,V-,
50
P+,P-
b &c a a 3/d -
Boiler Enable/Disable On
Domestic Hot Water Demand Monitored
System Pump Feedback Monitored
Starts in response to System Pump Feedback Input SI
Combustion Air Damper Open
Alarm Status is Monitored
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Start/Stop Sequence States
- - - 53 -
Call For Heat
Recycling Limits Made
Non-Recycling Limits Made
Call For Heat Relay On
Spare Output On
Boiler Pump On
System Pump On
Modulate
54/d 4/d