AHRI APEX, Installation, Operating And Service Instructions

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X. Operation
G. Changing Adjustable Parameters (continued)
Central Heat
Setpoint
Heating Element Type
Central Heat
Setpoint
Heating Element Type
180°F to 190°F
(82.2°C to 87.8°C)
Fan Coil
100°F to 140°F
(37.8°C to 60°C)
In Slab Radiant High
Mass Radiant
160°F to 190°F
(71.1°C to 87.8°C)
Convection
Baseboard
Fin Tube
Convective
130°F to 160°F
(54.4°C to 71.1°C)
Staple-up Radiant
Low Mass Radiant
130°F to 160°F
(54.4°C to 71.1°C)
Radiant
Baseboard
140°F to 160°F
(60°C to 71.1°C)
Radiators
Figure 40: Outdoor Reset Curve
Outdoor Air Temperature
-20 10 5 -15 -10 -5
0
110
45 40 20 25 30 35 55 60 65
70
15 50
145
115
150
120
140
135
130
125
155
190
160
195
165
185
180
175
170
200
Boost Maximum Off Point
= Central Heat Setpoint
minus Diff Above
Low Boiler Water Temp
Default = 110 F
High Outside Air Temp
Default = 70 F
10 F
H
ot
W
at
er
S
et
po
in
t
Minimum Water Temperature
Default = 130 F
TOD Setback Setpoint
Default = 170 F
Central Heat Setpoint
Low Outside Air Temp
= 180 F & 0 F
Default Outdoor Air Reset Setpoint
(Shown Bold)
Default Boost Outdoor Air Reset Setpoint
( Shown with thin lines , typical)
( Reset setpoint increased by 10 F every
20 minutes that demand is not satisfied .
Boost Time is field selectable
between 0 to 30 minutes)
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