Sequence Of Operation - NTI Trinity Ti 150 Installation And Operation Instruction Manual

11.0 Sequence of operation

The following is the normal sequence of operation for the trinity boiler.
Energizes
Combi Model
3-way diverter
valve
Energizes Primary
Pump (C1)
Igniter warm-up
Sentry 2100
Modulates Fan
based upon setpoint
and programing
Call for flame ends
Trinity Sequence of operation
120v Power
Applied
Combi
or
Indirect
Indirect
Water
Energizes Indirect Pump
Heater
Error
A S O
Closed
24 Vlot signal
to blower
Open
Error
A S C
Power to Ignitor
120V to S1
5 seconds
Power to Gas Valve
Displays version
t2.0
Indirect thermostat
or flow switch closes A-C
((Call for Domestic))
A-C Closed
(Ap) turns off C1
Air
Switches
Open
Closed
Prepurge
Greater than 1.0 microA
Boiler in
standby mode
Thermostat, End switch
or relay closes T-C
((Call for Heat))
Awaiting
Input
Energizes Primary
Pump (C1)
((Call for Ignition))
Sentry 2100
Sentry 2100
Sentry 2100
Fan to SFS (75)
Sentry 2100
24VAC from Sentry
B1 to Fenwal W
Three
Retries
for Flame
Flame Probe
Signal < 1 micro A
Less than
1.0 microA
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