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ManualsBrandsTekmar ManualsThermostats & ControlsBoiler Control - tN4 Compatible - Outdoor Temp. Reset - Four Modulating Boiler - DHW - Setpoint - BAS

Current Switch

S3S5

P3 P4 P5 P6

284

S1 = Outdoor Sensor

S2 = Boiler Supply Sensor

S3 = Boiler Return Sensor

S4 = DHW Sensor

S5 = Boiler Inlet Sensor

S6-S9 = Boiler Outlet Sensors

P1, P2 = Primary Pumps

P3-P6 = Boiler Pumps

P7 = IDHW Pump

Application A 284-2 Mechanical

Description

Four modulating condensing boilers are operated to provide an outdoor temperature reset boiler target for a space heating

load. The fourth boiler also operates to provide heat for an indirect DHW load with priority over space heating.

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.

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.

Boiler ∆T monitoring is available when using optional boiler outlet sensors (S6 to S9) and boiler inlet sensor (S5).

The boiler outlet sensor S9 is required for indirect DHW operation.

•

ENABLE (1) = AUTO

CONDENSE (1) = YES

Boil TYPE (1) = MOD

ENABLE (2) = AUTO

CONDENSE (2) = YES

Boil TYPE (2) = MOD

ENABLE (3) = AUTO

CONDENSE (3) = YES

Boil TYPE (3) = MOD

ENABLE (4) = AUTO

CONDENSE (4) = YES

Boil TYPE (4) = MOD

Essential Source (#) Settings:

APP MODE = RSET

PUMP 1 = AUTO

PUMP 2 = AUTO

IDHW MODE = ON

IDHW LOCATION = NEAR

IDHW SENSOR = ON

Essential System Settings:

Legend

DIP Settings:

External Flow Proof / Off

External C.A. Proof / Off

Off / Exercise

Setback / Off