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Sup
Com
Ret / I
Com(-)
Os / V
Boil
Boil
Dem
Dem
tN4
Signal wires must
be min. 300V ratin
g
Class 2
Only
Optional
Boiler On/Off
Output
Return
Sensor
Optional Zone
Control Input
Use copper
conductors only
Outside
Temp
Sensor
Supply
Sensor
Fig. 8
Figure 9
- Dip Switches
ON
⇑
5.
Settings
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
ON position
Max supply set at
140°F
ON position
Boiler minimum
set at 135°F
Starting Temp.
70°F
Starting Temp.
75°F
