Install Instructions

Heating Curve Dial
Before adjusting the dial settings, read through the
sequence of operation to ensure that you understand
how the control operates.
During outdoor reset operation, the
Heating Curve setting determines
the number of degrees the supply
water temperature is raised for each
one degree drop in outdoor
temperature. The Heating Curve
dial position can be calculated from
the following formula.
Heating Curve =
Design supply temperature – occupied temperature
Occupied temperature – design outdoor temperature
Example: A system is designed to supply 120°F
(49°C) water when the outdoor temperature is 10°F
(-12°C). The Occupied temperature is 70°F (21°C).
Heating Curve = 120 - 70°F (49 - 21°C)
70 - 10°F (21 – (-12°C))
50°F (28°C)
60°F (33°C)
Page 14
=
= 0.8
Figure 8B -
Heating Curve Dial
Dip switch settings
POSITION
SWITCH ON OFF DEFAULT
A
Permanent External ON position
Demand Demand Permanent Demand
Max system Max system ON position
B supply set supply feature supply set at
at 140
o
F is off 140
o
F
Boiler return Boiler return ON position
C minimum set minimum feature minimum set at
at 135
o
F is off 135
o
F
D Heating curve Heating Curve 5
o
F On position
No shift Parallel shift No shift