tekmar 275 Boiler Control - Manual (Page 28)

© 2012 275_D - 11/12 28 of 48
Cleaning the Control
The control’s exterior can be cleaned using a damp cloth. Moisten the cloth with water and wring out prior to wiping control.
Do not use solvents or cleaning solutions.
DIP Switch Settings
Set the DIP switch settings prior to making adjustments
to the control through the user interface. Setting the DIP
switches determines which menu items are displayed in
the user interface.
Switch Settings
Setback
Boiler Control 275
One tN4, Four Modulating Boiler & DHW / Setpoint
Menu Item
Test
Boiler Demand
DHW / Setpoint Demand
Proof Demand
EMS Input Signal
Priority Override
Power 115 V ±10% 60 Hz 7 VA, 1150 VA max. Relays 230 V (ac) 5 A 1/3 hp Demands 20 to 260 V (ac) 2 VA
Made in Canada by tekmar Control Systems Ltd tektra 1020-01
Meets Class B: Canadian ICES FCC Part 15
For maximum heat, press and hold Test button for 3 seconds.
not testing testing testing paused
off red red
BTC I
Off
EMS Rotate Fixed Last Pump Sequencer
Exercise
Off
Demands
Dat e Code
H2048B
Signal wiring must be rated at least 300 V.
DHW
29
/Setp Com
30
Dem Pr.
31
Dem
2
–
5
– Mod1
1
+ Mod2
3
+ – + Mod3
4
+ Mod4
6
+ BRet/
7
Com
8
tN4
12
Boil
9
Out
10
Com
11
Prim P1 L N
26
Power
28 27 14 13 Do not apply power 24
DHW / P2
23 25 16 15 18 17 20 19 22 21
Fixed Lead First On / Last Off
First On / First Off
Relay 1 Relay 2 Relay 3 Relay 4 C.A. /
Alert Boiler Demand Sup DHW
Zone Load Shedding
EMS / Demands
The EMS / Demands DIP switch selects whether a tekmar
outdoor sensor 070 or an external 0-10 or 2-10 V (dc) input
signal is to be connected to the com - and Out+ terminals
(2 & 3).
Set the EMS / Demands DIP switch to EMS if an Energy
Management System is providing an external analog input
signal to the control.
Set the EMS / Demands DIP switch to Demands if the
control is accepting a boiler demand and using the outdoor
sensor for outdoor reset.
Setback BTC I
Off
EMS
Rotate Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
Lock / Unlock
Use this DIP switch to lock and unlock the Access Level
of the 275 and all connected tN4 devices, including tN4
thermostats. For details, see “Access Level”.
• Once locked, the access level in all devices cannot be
viewed or changed.
• When the control is locked, a small segment representing
a padlock is shown in the bottom right hand corner of the
display (except in View and Time Menu)
Setback BTC I
Off
EMS
Rotate Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
Off / Exercise
Use the Off / Exercise DIP switch to select whether or not
the control is to exercise all pumps, and hydronic zones
(zone valves and zone pumps) for 10 seconds every three
days of inactivity to prevent seizure.
Setback BTC I
Off
EMS
Rotate Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
Setback / Off
Use the Setback / Off DIP switch to select whether or not
the control is to follow a schedule.
If the 275 is to be a schedule member or schedule master,
set the DIP switch to Setback to enable the Time and
Schedule menus and the Unocc items in the Adjust
menu.
If the 275 does not follow a schedule, set the DIP switch
to Off to disable the Time and Schedule menus and the
Unocc items in the Adjust menu.
Setback BTC I
Off
EMS
Rotate Fixed Last
Pump Sequencer
Exercise
Off
Demands
Fixed Lead
First On / Last Off
First On / First Off
•
•
Control Settings