tekmar 362 Mixing Control Installation - Manual (Page 4)

4 of 36 Copyright © D 362 -
12/08
P1
OR
Mixing
P1
OR
Mixing
Sequence of Operation
Section A
General
Page 4 - 5
Section B
Mode 1:
Heating
Page 5 - 9
Section C
Mode 2:
Snow Melting
Page 9 - 13
Section D
Boiler Operation
Page 13 - 15
Section A —General Operation
POWERING UP THE CONTROL
When the Mixing Control 362 is powered up, the control displays the control type number in the LCD for 2 seconds. Next, the software
version is displayed for 2 seconds. Finally, the control enters into the normal operating mode and the LCD defaults to displaying the
current outdoor air temperature.
MODES OF OPERATION
The Mixing Control 362 has two distinct operating modes. The mode of
operation for the control is selected in the Adjust Menu.
MODE 1 (Heating)
Mode 1 is the Heating mode of operation. In this mode, the 362 is an
Outdoor Reset control for a building heating system. The 362 uses a
mixing device to vary the supply water temperature to the building
heating system according to the outdoor conditions.
MODE 2 (Snow Melting)
Mode 2 is the Snow Melting mode of operation. In this mode, the 362 is
a Slab Outdoor Reset control for a single zone of snow melting. The 362
uses a mixing device to vary the supply water temperature to a single
zone snow melting system. In the Snow Melting mode, the 362 uses a
slab sensor and mixing return sensor in order to provide slab temperature
control and slab protection. It is recommended to purchase a Snow Melt
Enable Kit 092 when using this mode of operation.
MIXING DEVICE SELECTION (MIXING)
The 362 can supply a lower water temperature to part of the heating system by varying the speed of an injection pump or modulating
a mixing valve. This selection is made under the MIXING item in the
Adjust Menu.
VARIABLE SPEED INJECTION (VAR)
A standard wet rotor circulator is connected to the 362 on the Pwr Mix and
Cls / Var terminals (8 and 10). The 362 increases or decreases the power
output to the circulator when there is a
Mix Demand. The circulator speed
varies to maintain the correct mixed supply water temperature at the mix
sensor. For correct sizing and piping of the variable speed injection driven
circulator, refer to essay E 021. A visual indication of the current variable
speed output is displayed in the LCD in the form of a segmented bar graph.
Two small indicators at the top of the graph indicate whether the output is
increasing or decreasing.
FLOATING ACTION (FLOT)
A floating action actuator motor is connected to the 362 on the Pwr Mix,
Opn, and Cls / Var terminals (8, 9 and 10). The 362 pulses the actuator
motor open or close to maintain the correct supply water temperature at the
mix sensor when there is a
Mix Demand. The mixing valve that the actuator
is connected to can be either a 2-way, 3-way or 4-way valve. A visual
indication as to whether the control is currently opening or closing the
mixing valve is displayed in the LCD with the words Open and Close. Also,
a visual indication of the current position of the valve is displayed in the LCD
in the form of a segmented bar graph.