tekmar 654 Snow Melting Control Installation - Manual (Page 22)

© 2013 654_D - 06/13 22 of 44
The Boiler Menu provides settings on how to configure and operate the boiler.
Boiler Menu
Item Field Range Access Description Set to
App Mode = Boil
MOD, 1STG,
EMS1, EMS2
Default = MOD
App Mode = Mix
OFF, ENBL,
CTRL
Default = OFF
App Mode = PWM
OFF, CTRL
Default = OFF
Installer
BOILER TYPE
The type of boiler connected to the control.
MOD = Modulating boiler.
1STG = Single one-stage on-off boiler.
EMS1 = tekmar boiler staging controls.
EMS2 = Viessmann modulating boilers with 0-10 V
OpenTherm Module.
CTRL = tekmarNet
® System Control operates boiler.
ENBL = When operating a mixing valve or mixing
injection pump, the heat relay is closed to fire the
boiler.
0-10 or 4-20
Default = 0-10
Installer
BOILER MODULATION TYPE
Select if the modulating boiler accepts a 0-10 V (dc) or
4-20 mA input signal to control the boiler firing rate.
Conditions: Boiler Type is set to MOD (modulating
boiler).
0 to 50%
Default = 0%
Installer
BOILER MINIMUM MODULATION
The minimum percent modulation of the boiler burner.
Conditions: Boiler Type is set to MOD (modulating
boiler).
OFF, 10 to 180
seconds
Default = OFF
Installer
BOILER MODULATION DELAY
Delay time between the burner firing and the boiler
releasing to modulation.
Conditions: Boiler Type is set to MOD (modulating
boiler).
30 to 230 seconds
Default = 30 seconds
Installer
BOILER MOTOR SPEED
The time required for the modulating actuating motor to
fully open the gas valve or ramp the burner fan from off to
full speed on a modulating boiler. Set to 30 seconds unless
otherwise recommended by the boiler manufacturer.
Conditions: Boiler Type is set to MOD (modulating
boiler).
AUTO, 2 to 42°F
(1.0 to 23.5°C)
Default = AUTO
Installer
BOILER DIFFERENTIAL
The temperature differential that the control is to use to
cycle the boiler on and off (half above and half below
target).
Conditions: Boiler Type is set to MOD (modulating boiler)
or 1STG (one stage).
OFF, 50 to 180°F
(10.0 to 82.0°C)
Default = OFF
Installer
BOILER MINIMUM
The minimum allowed boiler target temperature and
boiler return protection temperature. Check the boiler
manufacturer’s manual for recommended supply water
temperatures.
Conditions: Application Mode is set to Boil or Application
Mode is set to Mix and the Boiler Type is set to CTRL (tN4
Control) and Out/Bret Sensor is set to RET (return).