tekmar 361 Mixing Control - Manual (Page 5)

Copyright © D 361 -
03/09
5 of 20
EXERCISING
The 361 has a built-in exercising function. If a pump has not been operated at least once every 3 days, the control turns on the output
for 10 seconds. This minimizes the possibility of a pump seizing during a long period of inactivity. While the control is exercising, the
Test LED flashes.
Note: The exercising function does not work if power to the control or pumps is disconnected.
SETBACK (UNOCCUPIED)
To provide greater energy savings, the 361 has a setback capability. With setback, the
supply water temperature in the system is reduced when the building is unoccupied. By
reducing the supply water temperature, air temperature in the space may be reduced even
when thermostat(s) are not turned down. Any time the
UnO Sw (11) and the Com (12)
terminals are shorted together, the control operates in the unoccupied (Night) mode. When
in the unoccupied (Night) mode, the UNOCC segment is displayed in the LCD. The 361
adjusts the supply water temperature based on the UNOCC settings made in the control.
This feature has no effect when the control is used as a setpoint control.
FACTORY DEFAULTS
The control comes preset with several factory defaults. These defaults are based on the terminal unit selection (see section B2). To
fine-tune building requirements, these defaults may be changed. If a factory default value for a terminal unit is changed, the terminal
unit number will flash when selected in the ADJUST menu.
To reload the factory defaults listed in section B2, power down the control and wait for 10 seconds. Power up the control while
simultaneously holding the
Item and buttons. The terminal unit number should now be displayed constantly in the LCD rather than
flashing.
Section B: Mixing
Section B1
General
Section B2
Installer
Section B3
Advanced
Section B1: General
MIXING DEMAND
A mixing demand is required in order for the 361 to provide heat. A mixing demand is
generated by applying a voltage between 24 and 240 V (ac) across the
Mixing Demand
terminals (1 and 2). Once voltage is applied, the Mixing Demand pointer is displayed in the
LCD. If the 361 is not in WWSD, the 361 closes the Sys Pmp contact. The 361 calculates
a MIX TARGET supply temperature based on the outdoor air temperature and settings. If
required, the 361 operates the boiler in order to provide heat to the variable speed injec-
tion pump.
SYSTEM PUMP OPERATION ( Sys Pmp)
The system pump contact ( Sys Pmp, terminal 5) closes whenever there is a mixing demand and the 361 is not in WWSD. The system
pump segment is displayed in the LCD. After the mixing demand has been satisfied, the 361 continues to operate the system pump for
20 seconds. This allows some residual heat to be purged out to the heating system. During WWSD, the system pump is operated based
on the exercise function.
INDOOR SENSOR
An indoor sensor may be used in order to provide indoor temperature feedback. The indoor sensor is connected to the Com and Indr
terminals (15 and 17). In addition, power must be applied to the Mixing Demand terminals (1 and 2) as described in the MIXING
DEMAND section. With the indoor sensor connected, the 361 is able to sense the actual room temperature. Indoor temperature
feedback fine-tunes the supply water temperature in the mixing system to maintain room temperature. To adjust the room temperature,
use the ROOM OCC or ROOM UNOCC setting in the ADJUST menu at the control.
If a multiple zone system is used with an indoor sensor, proper placement of the indoor sensor is essential. The indoor sensor should
be located in an area which best represents the average air temperature of the zones.
1 2
Mixing
Demand
24 to 240 V (ac)
11 12
Timer Switch
UnO
Sw
Com