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Modulating Boiler Operation --------------------
The 406 can operate a single hot-water modulating boiler
using the Mod dc/mA output and the Backup contact. Not all
boilers require the use of the Backup contact.
The control operates the boiler by first switching the Backup
contact to allow the modulating boiler to go through the ignition
sequence. A 0-10 V (dc) or 4-20 mA analog signal is then used
to modulate the boiler firing rate starting from 50% (5 V (dc)
or 12 mA signal) for 30 seconds.
After the 30 second delay has elapsed, the control will then
allow the boiler to modulate down to the minimum modulation
setting and hold it there for the MOD DELAY time.
After the MOD DELAY has elapsed, the control uses PID
logic to change the boiler firing rate signal in order to satisfy
the boiler target temperature. When the firing rate signal is
reduced down to the MIN MOD setting and the boiler supply
temperature exceeds the boiler target by 1/2 of the differential,
the control will shut off the burner.
Essential Settings for House Control 406 with Common Modulating Boilers
BOIL
BOIL
Boiler Model
MOTR
TYPE
(sec)
Buderus
GB142, 162,
0-10
312
Burnham
4-20
Alpine
Dunkirk
0-10
Q95M-200
Heat Transfer
0-10
Products Elite
Heat Transfer
Products
0-10
Munchkin
Laars
4-20
NeoTherm
Lochinvar
0-10
Knight
Lochinvar
0-10
Sync
Peerless
PureFire
0-10
REV2
Triangle Tube
0-10
Prestige Solo
Weil-McLain
0-10
Ultra Series 3
Viessmann
EMS 2
Vitodens 100
Wiring diagrams for these boilers are available in the Service Bulletin SB064 from http://tekmarcontrols.com/sb.html
For a complete list of compatible boilers, download SB032.
© 2011
D 406 - 12/11
--------------------
MIN
MOD
Equipment
MOD
DELAY
from Boiler
(%)
(min)
Manufacturer
10
30
0:10
EM10 Module
30
0
0:10
10
18
1:45
24
16
0:00
60
16
0:00
30
0
0:50
16
20
0:10
16
20
0:10
50
20
0:00
Adapter PFA-
90
18
2:05
60
20
0:30
Input Module
N/A
N/A
N/A
Boiler Motor Speed --------------------- -- -- -- -- -
The Motor Speed is the amount of time the boiler requires to
go from 0% modulation to 100% modulation.
Gas valve actuating motors have a design time from fully
closed to fully opened which can be found in the manufacturer's
manual. The Motor Speed should be set to this time.
The Motor Speed setting for a Variable Frequency Drive (VFD)
is the amount of time required to go from a stopped position
to 100% fan speed. Since a VFD has a very quick response
rate, it may be necessary to increase the Motor Speed setting
in order to increase the stability of the boiler modulation.
Use the BOIL MOTR setting in the Adjust Menu to select an
appropriate boiler motor speed.
Boiler Control Setting
Required
Parameter Setting Reference
None
Central
Heating
None
Modulation
Source
HAM 0-
Parameter
10VDC
34 [P .34]
Module
Function 16 0-10 Volt
None
Function 17
Munchkin
Function 16
Interface
Function 17
Board
None
None
None
H3
Demand
None
conf
Interface
Heating
Mode
1
Parameter
None
45
ADD'L HEAT
None
DEMAND
None
0-10V OT
40 of 48
------------------------------
OR
--------------------------------
----------------------- -- -- -- - --
Wiring Terminals
Backup
None
None
p.109 I&O
4-20mA
1
Manual
p.3 Ham
[- - 04]
Installation
Instructions
p.57
Installation
Fan
Manual
Speed
1
p.60 Boiler
Manual
1
None
None
5
p.24 Service
Active
Manual
p.19 Service
3
Manual
p.43 I&O
Mode 5
Manual
p.54 I&M
02
Manual
p.64 Boiler
Type 4
Manual
None
None
Mod dc/mA
+
2
1
2
9
10
+
-
+
_
6
4
3
33
34
19
20
16
15
17+ 18-
6
5
1
4
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