Walter Wilson HYDRA09-E2401M-D Guide D'installation Et Manuel Du Propriétaire page 28

Boiler water temperature variation according to outdoor temperature
Range of water temperature variation according to
potentiometer adjustment
210
190
170
150
130
110
90
70
90 110 130
Ajustement potentiomètre (
Potentiometer adjustment (Tpot) = 210˚F
Based on graph 1, the water temperature will vary between 210˚F (Tmax water) and 170˚F (Tmin water)
•If outdoor temperature is greater or equal to 10˚C (50˚F):
Graph 2 indicates that the boiler will maintain a water temperature of 170˚F (Water temperature = Tmin
water)
•If outdoor temperature is lower or equal to -10˚C (14˚F):
Graph 2 indicates that the boiler will maintain a water temperature of 210˚F (Water temperature = Tmax
water)
•If outdoor temperature is between -10˚C (14˚F) and 10˚C (50˚F):
Graph 2 indicates that the boiler will maintain a water temperature between 210˚F and 170˚F. At 0˚C
(32˚F), the water temperature will be mid-way between Tmax water and Tmin water. Therefore, we can
expect a water temperature of approximately 190˚F.
GRAPH 1
150 170
o
F)
o
Potentiometer setpoint ( F)
Water temperature variation according to outdoor temperature
Tmax eau
Tmax water
Tmin eau
Tmin water
APPLICATION EXAMPLE FOR GRAPHS 1 AND 2
FIGURE 2
Tmax eau
Tmax water
Tmin eau
Tmin water
190 210
GRAPH 2
-15 -10 -5
Température extérieure (
Outdoor air temp (
0 5 10
o
C)
o
C)
15
9