tekmar 279 Steam Control - Manual (Page 5)

5 of 24 © 2010 D 279 - 05/10
The Adjust menu includes a Steam Established setting that
delays the start of the heating cycle until the condensate
sensor has reached a set temperature.
One method to set the Steam Established setting requires
two people with two-way radios. One person is at the
control location; the other person is at the furthest radiator
location. The steam system can be manually started using
the Max Heat feature. Once the furthest radiator starts
to get steam, exit the Max Heat feature and view the
Condensate temperature in the View menu. The measured
condensate return temperature can be entered as the
Steam Established setting.
Last Radiator
Radiator
Vent
Best
OK
Supply Main
Condensate Return
Sensor Location
Main
Air Vent
45 minutes off time 45 minutes off time
15 minutes
on time
Boiler Off Boiler On
Off
Boiler Off
Steam established - start cycle
Steam established
temperature setting
E
s
ta
b
li
s
h
in
g
S
te
a
m
(w
a
rm
-u
p
p
e
ri
o
d
)
Establishing Steam
(w
arm-up period)
E
s
ta
b
li
s
h
in
g
S
te
a
m
(w
a
rm
-u
p
p
e
ri
o
d
)
Establishing Steam
(w
arm-up period)
est.
on
on
off off
est.
220°F -
210°F -
200°F -
190°F -
180°F -
170°F -
160°F -
150°F -
140°F -
Steam established - start cycle
Boiler On
Boiler
Operation
Condensate Return T
e
mperature
15 minutes
on time
60 minute cycle 60 minute cycle
25% on time with Condensate Return Sensor and ‘Steam Established’ set to 170°F
Minimum On Time
In cases where a condensate return sensor cannot be
installed, a Minimum On Time can be set to account for the
establishing steam time period. Setting a Minimum On Time
for a steam system can be problematic because a system
takes more time to reach operating temperature from a cold
start than when it is hot from a previous cycle. To set the Minimum On Time, manually start the steam
system using the Max Heat feature and at the same time,
start a stopwatch timer. Measure the amount of time required
for steam to reach the furthest radiator. Then, exit the Max
Heat feature and enter the recorded time as the Minimum
On Time setting.
One Pipe System:
Thermostatic
Trap
Float &
Thermostatic
Trap
Condensate Return
Sensor Location
Best
OK
Return
Air Vent
Most Distant Radiator
Two Pipe System:
Supply
Air Vent