Application Brochure

© 2013 284_A - 02/13 10 of 12
Application A 284-5 Mechanical
Concept Drawing: This is only a concept drawing, not an engineered drawing. It is not intended to describe a complete system, nor any particular system. It is up to the
system designer to determine the necessary components for and configuration of the particular system being designed, including additional equipment, isolation relays
(for loads greater than the control’s specified output ratings), and any safety devices which in the judgement of the designer are appropriate, in order to properly size,
configure and design that system and to ensure compliance with building and safety code requirements.
P3
P4
P5
P1
X1
X2
P2
P6
S2
S4
S6 S7
F1
S8
S3
S5
482 / 483
Indoor
Sensor
Array 084’s
132
tekmarNet
®
4
284
S1
C.A. Damper
538
C.A.
Proof
Description
Two modulating non-condensing boilers are operated to provide a boiler target temperature for space heating and indirect
DHW loads. The boiler target temperature for the space heating load is determined from outdoor temperature reset and
indoor temperature.
Features:
The boiler plant is sequenced to obtain maximum efficiency based on the boiler types & target temperatures. For detailed
information about sequencing, rotation & staging, refer to the 284_D Installation & Operation Manual.
Dual primary pumps with a flow proof provide redundancy. Pumps can be sequenced with equal run-time rotation. A
pressure differential switch is used to prove primary pump flow.
System includes combustion air (C.A.) damper. Proving of C.A. damper via external C.A. proof (motor end switch).
A flow sensor and pressure sensor are used for monitoring flow, energy and gauge pressure.
Boiler ∆T monitoring is available when using optional boiler outlet sensors (S6 & S7) & boiler inlet sensor (S5).
Remote access options are available through the tN4 Gateway 482 or 483.
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ENABLE (1) = AUTO
CONDENSE (1) = NO
Boil TYPE (1) = MOD
ENABLE (2) = AUTO
CONDENSE (2) = NO
Boil TYPE (2) = MOD
ENABLE (3) = OFF
ENABLE (4) = OFF
Essential Source (#) Settings:
DIP Settings:
External Flow Proof / Off
External C.A. Proof / Off
Off / Exercise
Setback / Off
APP MODE = RSET
AUX RELAY = DMPR
PUMP 1 = AUTO
PUMP 2 = AUTO
IDHW MODE = ON
Essential System Settings:
IDHW LOCATION = Boil
IDHW SENSOR = ON
IDHW PRIM PUMP = OFF
FLOW SENSOR = ON
PRES SENSOR = ON
S1 = Outdoor Sensor
S2 = Boiler Supply Sensor
S3 = Boiler Return Sensor
S4 = DHW Sensor
S5 = Boiler Inlet Sensor
S6, S7 = Boiler Outlet Sensors
S8 = Pressure Sensor
P1, P2 = Primary Pumps
P3, P4 = Boiler Pumps
P5, P6 = IDHW Pump
X1 = Pressure Differential Switch
X2 = Flow Switch
(connected to 132)
Legend