Tekmar 362 User manual

1 of 36 Copyright © D 362 -12/08
The Mixing Control 362 is a microprocessor based control with two distinct operating modes.
MODE —1—allows the control to provide a reset mixed supply water temperature to a heating system based on outdoor air temperature.
Multiple zone temperature controls can be achieved by using either a conventional thermostat system or by using tekmar Zone Controls
attached to the 362. For single zone heating applications, a single Room Temperature Unit (RTU) can be connected directly to the 362
for zone temperature control.
MODE —2— allows the control to provide a single zone of snow melting. With the addition of a Snow Melting Kit 092, the 362 can
provide slab temperature control and slab ΔT protection. The melting mode is initiated manually either with a demand signal or from the
Snow Melting Kit enabling device.
The 362 incorporates a large Liquid Crystal Display (LCD) in order to provide system status and operating information. The same LCD
is used when setting up and installing the control. Standard features for both modes of operation include boiler return protection,
intelligent boiler operation, Warm Weather Shut Down (WWSD), and pump exercising. As well, with the addition of a new Monitor
feature, it is now possible to track pump and boiler running hours, boiler cycles and high and low sensor temperatures. The 362 also has
a unique feature that allows the control to supply heat to the mixed system from either the boiler or a thermal storage tank.
not testing
testing
off
red
LR58233 E150539
70
Input
tekmar Slab Sensor or Indoor Sensor or
Zone Control
OR OR
Input
tekmar
Timer
UnOcc
°
F
View
Open
Operating Modes
1Heating
2Snow melting
4
Te s t
not testing
testing
off
red
25
Mix
Pmp
7
Pwr
Mix
913
tN1/
tN2
14
Com
15
10K
16
UnO
Sw
17
Com
Mixing Control 362
Floating Action / Variable Speed
36810
Boiler
Opn Cls
Var
Mix Demand
WWSD
Minimum
Maximum
Melting
Idling
11 12
Com Mix
Ret
Mix
19
Boil
20
Out
18
Mix
Demand
Reset Ratio
Setback
Characterized
Heating Curve
None
Do not apply power
Menu Item
Power
N L
R
C US
1
%
For maximum heat,
press and hold
Test
button for 3 seconds.
Output
M
Output
Mixing Valve & Actuating
Motor OR Var. Speed
Driven Pump
OR
Input
Universal
Input
Room
Temperature
Unit (RTU)
Input
Remote
Display
Module (RDM)
OR OR
Input
Snowmelt
Kit
(SMK)
8
79
ItemMenu
°
F
View
!
WWSD
1
%%
2
ItemMenu
°
F
View
!
WWSD
1
%%
2
Input
Universal
Sensor
Included
Input
Universal
Input
Outdoor
Output
Mixing System
Pump
Input
120 V (ac) Power
Supply
Input
Mix Demand
Signal
D 362
12/08
Mixing Control 362
- Data Brochure
Note:
Mixing demand must be
powered with 20 to 260
V (ac) before the mixing
valve is able to open and
the boiler is able to fire.
Made in Canada by
tekmar Control Systems Ltd.
tektra 929-04
Signal wiring must be rated at least 300 V.
Wiring must be rated 194°F (90°C) minimum
Meets Class B:
Canadian ICES
FCC Part 15
Date Code
See product literature
INSTALLATION CATEGORY II
H1176D
1
Power 115 V ±10% 60 Hz 900 VA
Relays 230 V (ac) 7.5 A 1/3 hp, pilot duty 240 VA
Var. Pump 230 V (ac) 2.4 A 1/6 hp, fuse T2.5 A 250V
Demands 20 to 260 V (ac) 2 VA
testing pausedred

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Copyright © D 362 -12/08
Menu
Item
Menu
Item
Menu
Item
How To Use The Data Brochure
This brochure is organized into four main sections. They are: 1) Sequence of Operation , 2) Installation , 3) Control Settings , and 4)
Troubleshooting . The Sequence of Operation section has four sub sections. We recommend reading Section A: General of the
Sequence of Operation , as this contains important information on the overall operation of the control. Then read to the sub sections that
apply to your installation.
The
Control Settings section (starting at DIP Switch Settings) of this brochure describes the various items that are adjusted and displayed
by the control. The control functions of each adjustable item are described in the Sequence of Operation .
User Interface
The 362 uses a Liquid Crystal Display (LCD) as the method of supplying information. You use the LCD in order to setup and monitor
the operation of your system. The 362 has four push buttons (Menu, Item, , ) for selecting and adjusting settings. As you program
your control, record your settings in the Adjust Menu table which is found in the second half of this brochure.
Menu
All of the items displayed by the control are organized into various menus. These menus are
listed on the left hand side of the display (Menu Field). To select a menu, use the
Menu
button. By pressing and releasing the Menu button, the display will advance to the next
available menu. Once a menu is selected, there will be a group of items that can be viewed
within that menu.
Item
The abbreviated name of the selected item will be displayed in the item field of the display.
To view the next available item, press and release the Item button. Once you have reached
the last available item in a menu, pressing and releasing the
Item button will return the
display to the first item in the selected menu.
Adjust
To make an adjustment to a setting in the control, begin by selecting the appropriate menu
using the
Menu button. Then select the desired item using the Item button. Finally, use the
and / or button to make the adjustment.
Additional information can be gained by observing the Status and Pointers fields of the LCD. The status field will indicate which of
the control’s outputs are currently active. Most symbols in the status field are only visible when the View Menu is selected.
Table of Contents
User Interface ........................................... pg 2
Description of Display Elements ............ pg 3
Sequence of Operation ........................... pg 4
Section A: General ........................ pg 4
Section B: Mixing Reset ............... pg 5
Section C: Snow Melting .............. pg 9
Section D: Boiler Operation ......... pg 13
Installation ................................................ pg 15
Electrical Connections.................. pg 16
Testing The Wiring......................... pg 18
DIP Switch Settings ................................. pg 20
Reference Material: Essay E 003: Characterized Heating Curve and Reset Ratio
E 021: Mixing Methods and Sizing of Variable Speed Injection Pumps
Access Levels ........................................... pg 20
Control Settings ........................................ pg 21
View Menu ...................................... pg 21
Adjust Menu ................................... pg 22
Schedule Menu .............................. pg 25
Miscellaneous Menu ...................... pg 25
RTU Menu ....................................... pg 26
Testing and Troubleshooting .................. pg 28
Monitor Menu ................................. pg 30
Error Messages .............................. pg 32
Technical Data .......................................... pg 36
Limited Warranty ....................................... pg 36

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Mix Demand
WWSD
Minimum
Maximum
Melting
Idling
Menu
Item
Number Field
Displays the current value
of the selected item
{
Buttons
Selects Menus, Items and
adjusts settings
Misc
°
F
°
C
Ovr
View
Adjust
Schd
hr
Monitor
Open
Close
1
%
Menu Field
Displays the
current menu
Status Field
Displays the current
status of the control’s
inputs, outputs and
operation
Item Field
Displays an abbreviated
name of the selected item
UnOcc
!
min
sec
Aux
1
DHW
2
Display
Symbol Description
1
%
Mixing Device Output Scale
Shows output of injection pump or mixing valve.
Arrows show whether the output is increasing
or decreasing.
Pump
Displays when mixing pump is in operation.
Burner
Displays when the boiler relay is turned on.
!
Warning
Displays when an error exists or a specific
limit has been reached.
°
F,
°
C, sec,
min, hr
°F, °C, sec, min, hr
Units of measurement.
Open / Close
Displays when floating actuator is opening or
closing.
Open
Close
Boost
Displays when control is in morning boost
after setback.
Occ
Occupied Schedule
Displays when the control is in occupied mode.
UnOcc
UnOccupied Schedule
Displays when the control is in
unoccupied mode.
Ovr
Override
Displays when the control is in override mode.
Pointer
Displays the control operation as indicated by
the text.
Lock - Unlock
Displays whether control is locked or unlocked.

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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.

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Section B1: General Mixing Operation (Mode —1—)
12
Mix
Demand
24 to 240 V (ac)
Section B2
Alternate Mixing
Demands
Section B1
General Mixing
Operation
MIX MAX
M
i
x
e
d
S
u
p
pl
y Wat
e
r
T
e
m
p
e
r
a
t
ur
e
Pointer On Pointer On
Section B: Mixing Reset (Mode —1—)
MIXING TARGET TEMPERATURE (MIX TRG)
(RESET RATIO & CHARACTERIZED HEATING CURVE)
When in Mode 1, the MIX TRG temperature is determined from either the Characterized Heating Curve or the Reset Ratio settings and
the outdoor air temperature. When in Mode 2, the MIX TRG temperature is determined from either the outdoor air temperature and the
desired slab temperature or the Melting and Idling settings. The control displays the temperature that it is currently trying to maintain
as the mixing supply temperature. If the control does not presently have a requirement for heat, it displays “- - -”in the LCD.
MIXING MAXIMUM (MIX MAX)
The MIX MAX sets the highest water temperature that the control is allowed
to calculate as the MIX TRG temperature. If the control does target the MIX
MAX setting, and the MIX SUP temperature is within 5˚F (3˚C) of the MIX
MAX, the
Maximum pointer is displayed in the LCD while either the MIX
TRG temperature or the MIX SUP temperature is being viewed.
BOILER PROTECTION (BoiL MIN )
The 362 is capable of providing boiler protection from cold mixing system
return water temperatures. If the boiler sensor temperature is cooler than
the Boil MIN setting while the boiler is firing, the 362 reduces the output
from the mixing device. This limits the amount of cool return water to the
boiler and allows the boiler temperature to recover. This feature can only
be used if the Boil SENS item is not set to NONE.
EXERCISING (EXERCISE)
The 362 has a built-in pump and valve exercising function. The exercising period is adjustable and comes factory set at 70 hours. If a
pump or valve output on the control has not been operated at least once during every exercising period, the control turns on the output
for 10 seconds. This minimizes the possibility of a pump or valve seizing during a long period of inactivity. In the case where a mixing
valve is being used as the mixing device, the 362 ensures that the valve operates over its entire range at least once each exercising
period.
Note: The exercising function does not work if power to the control or pumps is disconnected.
MIXING DEMAND
A mixing demand is generated by applying a voltage between 24 and 240 V (ac) across the
Mix Demand terminals (1 and 2). Once voltage is applied, the Mix Demand pointer is displayed
in the LCD. If the 362 is not in WWSD, the 362 closes the Mix Pmp contact. The Mixing Pump
segment is displayed in the LCD. The 362 calculates a MIX TRG supply temperature based
on the outdoor air temperature and settings. If required, the 362 operates the boiler in order
to provide heat to the mixing device.
CHARACTERIZED HEATING CURVE OR RESET RATIO
When used as a mixing reset control (MODE 1), the 362 has two methods of varying the supply water temperature based on the outdoor
air temperature. The installer can select either a Characterized Heating Curve or a Reset Ratio .
Characterized Heating Curve
The Characterized Heating Curve method of controlling the supply water temperature based on outdoor air temperature and optionally
indoor temperature is the most accurate. The control takes into account the type of terminal unit that the system is using. Since different
types of terminal units transfer heat to a space using different proportions of radiation, convection and conduction, the supply water
temperature must be controlled differently. Once the control is told what type of terminal unit is used, the control varies the supply
water temperature according to the type of terminal unit. This improves the control of the air temperature in the building.
Reset Ratio
The Reset Ratio method of controlling the supply water temperature is based solely on the outdoor air temperature. This method does
not take into account the type of terminal unit that the heating system is using and therefore is not as accurate as a
Characterized Heating Curve .