Sequence Of Operation - NTI Ti100-200 Installation And Operation Instructions Manual

Ti Series

14.0 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)
Error
A S C
24 Vlot signal
to blower
Open
Hi pressure N.C.
Switch on Ti400
ONLY
Error
A S O
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
Closed
Closed
NC
Closed
Power to Ignitor
120V to S1
Igniter warm-up
5 seconds
Power to Gas Valve
Installation and Operation Instructions │Trinity
Displays version
t2.0 or t4.0
Indirect thermostat
or flow switch closes A-C
((Call for Domestic))
A-C Closed
(Ap) turns off C1
Air
Switches
NO
Open
Sentry 2100
Sentry 2100
Fan to SFS (75)
Open
NO
Prepurge
Signal < 1 micro A
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
24 V
Manifold & Stack Limit
(Ti 150 & Ti200)
Manifold Limit
& Flow Switch
(Ti 400)
24 V
Three
Retries
for Flame
Flame Probe
Less than
1.0 microA
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