tekmar 284 Boiler Control - Manual (Page 17)

© 2014 284_D - 08/14 17 of 60 A Watts Water Technologies Company
The control can operate to provide heat for a Dedicated
Domestic Hot Water (DDHW) system.
DDHW heating is available by setting the Application Mode in
the Setup Menu to DDHW.
DHW Call ----------------------------------------- -----------------------------------------
A DHW Call is required in order for the control to provide heat
to a dedicated DHW tank. Once the control registers a DHW
Call, it will display the “DHW” icon under Calls in the display.
This can be done by:
DHW Sensor
The control can register a DHW Call when a DHW Sensor is
wired to terminals 21 & 22. Once the DHW Sensor temperature
drops 1/2 of the DDHW Differential setting below the DDHW
Setpoint, the control registers a DHW Call.
DDHW Differential -------------------------------- --------------------------------
A DHW Call is registered when the temperature at the DHW
sensor drops the DDHW DIFF setting below the DDHW Setpoint
setting. The DHW Call is satisfied once the temperature at the
DHW Sensor rises to the DDHW Setpoint setting.
IDHW
Differential
DHW Target
ON
OFF
Boiler Target Temperature During a DDHW Call ---- ----
When a DHW Call is present, a boiler target is determined. The
boiler target is set to the DDHW Setpoint setting.
DDHW During UnOccupied ----------------------- -----------------------
A second DDHW Setpoint setting is available for the
UnOccupied periods.
DIP Switch must be set to Setback to view UnOccupied
items.
During the Away Scene, DHW Calls are ignored.
Dedicated Domestic Hot Water (DDHW) Operation
Building Automation System (BAS)
The control can communicate with a Building Automation System
(BAS) to provide remote monitoring & adjustment capability.
BAS Mode ---------------------------------------- ----------------------------------------
There are two modes of BAS communication that define the
interaction between the BAS & the control. The level of interac-
tion is determined by the Application Mode setting.
Refer to the BAS Integration Manual 284_B for more information
including a listing of the read / write parameters.
Monitor
Monitor mode is available when the Application Mode is set
to either Outdoor Temperature Reset, Setpoint, Dedicated
Domestic Hot Water (DDHW) or Energy Management System
(EMS).
With Monitor mode, the control allows for viewing & adjustment
capability of select items within the various menus.
Temperature
Temperature mode is available when the Application Mode is
set to Building Automation System (BAS).
With Temperature mode, the control operates to maintain
the setpoint temperature provided over the BAS network. In
order for the control to be able to operate to maintain the BAS
Setpoint, the BAS must also write a Setpoint Call command
over the BAS network.
If primary pump operation is desired, the BAS must write a
BAS Primary Pump command over the BAS network.
If indirect DHW pump operation is desired, the BAS must write
a BAS IDHW Pump command over the BAS network.
BAS Type ----------------------------------------- -----------------------------------------
The control supports Modbus ® & BACnet ® IP communications.
Selection is made through BAS TYPE item in the BAS menu.
If the control is not being connected to a BAS network, select
NONE.
Network Configuration Settings in BAS Menu ---- ----
Refer to the BAS menu section of this brochure for a listing of
all the BAS network configuration settings.