5
2
5
3
1
4
Function A - Temperature control
At the set temperature, the valve plug, controlled by the thermostatic balancing cartridge,
gradually closes the outlet to the minimum. The outlet never fully closes to always allow a
minimum flow for temperature sensing and to prevent recirculation pump dead-heading. If the
temperature decreases, the outlet increases, causing flow and thus temperature to increase
back to the set temperature as shown in curve 1. If temperature exceeds the set-point, the
plug stays in the minimum closed position as shown in curve 2. The balancing cartridge has a
throttling range of 60°F, from full open to minimum position.
Cv
max
T (°F)
G (gpm)
Cv
dis
Cv
min
Automatic disinfection
C
Thermal disinfection
Temperature control
100
140
150
160
190
170
180
185
T
set
(2.1)
(1.2)
(0.23)
Cv
design
(0.52)
1
2
3
5
6
4
7
8
1
2
3
5
4
6
7
8
1
2
3
5
6
4
7
8
1
2
3
5
4
6
7
8
Function B - Automatic thermostatic disinfection
The 116
2
xx series operating characteristic curves for operating mode B are curves 1,
2, 3 and 4. When a temperature higher than about 155°F (68°C) is reached, a by-pass
passage begins to open to activate the second thermostatic cartridge which controls the
thermal disinfection process, allowing flow independent of the operation of the thermostatic
balancing cartridge. This allows water flow through a special by-pass port, opening the flow
path up until the temperature of 160°F (70°C) is attained shown in curve 3. If the temperature
continues rising beyond this point, the flow is reduced through the by-pass port to allow
thermal balancing even during the disinfection process. When temperature reaches about
170°F (75°C), the closes the disinfection by-pass port to protect the system fixtures from the
effects of excessive temperatures, as shown in curve 4.
1
2
3
5
6
4
7
8
1
2
3
5
4
6
7
8
1
2
3
5
6
4
7
8
1
2
3
5
4
6
7
8
Thermostatic control
Minimum flow rate
Thermostatic disinfection
Thermal shut-off
