65
CHAPTER 13
CHAPTER 13 - EXTERNAL MODULATING CONTROL
The PRESTIGE Solo can directly accept an analog
0-10 VDC signal from an external modulating boiler
controller to control the ring rate.
13.1. Wiring the Modulating Controller
Run two 18 gauge wires from the external modulating
boiler controller’s 0-10 VDC boiler output to low voltage
terminals X5-1&2 located at the bottom of the ACVMax
control module, as shown in Fig. 23 on page 36.. This
signal will both enable and modulate the boiler. No wir-
ing is required at the thermostat terminals.
External modulating control will only function if the
external modulating controller is properly wired to the
PRESTIGE Solo as follows:
• X5-1 = +
• X5-2 = -
Ensure that the polarity of the connections
from the external modulating boiler controller
to the boiler are correct. Reversed polarity will
lead to no response from the boiler.
NOTICE
13.2. ACVMax Programming
The ACVMax control module must be programmed to
accept the 0-10 VDC signal from the external modulat-
ing boiler control.
1. Use the Heating EZ Setup function to set CH De-
mand to 0-10V Modulation Signal. Reference Sec-
tion 9.7 on page 46.
13.3. Programming of External Modulating
Control
The external modulating control must be programmed
to send 2 VDC to enable the boiler and run it at low re,
and 10 VDC to run the boiler at high re. Once the con-
trol enables the boiler, it must wait 30 seconds to allow
the burner to stabilize before modulating the boiler.
Factory ACVMax Settings
HEATING SETTING
FACTORY
DEFAULT
MINIMUM
SETTING
MAXIMUM
SETTING
EZ SETUP RESET INSTALLER RESET
Heating Operation Enabled
3
Demand Type
Thermostat &
Outd. Curve
3 3
Absolute Max CH Setpoint 188°F [87°C] 68°F [20°C] 188°F [87°C]
CH1 Maximum Setpoint 140°F [60°C] 68°F [20°C] 188°F [87°C] 180°F [82°C]
3
CH1 Minimum Setpoint 80°F [27°C] 60°F [15°C] 188°F [87°C]
3 3
Outdoor Curve Coldest Day 10°F [-12°C] -30°F [-34°C] 50°F [10°C]
3
Outdoor Curve Warmest Day 64°F [18°C] 60°F [15°C] 78°F [25°C]
3
CH2 Circuit Enabled
3
CH2 Maximum Setpoint 140°F [60°C]
68°F [20°C] 194°F [90°C]
3 3
CH2 Minimum Setpoint 80°F [27°C]
60°F [15°C] 190°F [88°C]
3 3
Warm Weather Shutdown O
O 78°F [25°C]
3 3
Circulation Pump Permanent Disabled
3
CH Post Pump Time 5 Minutes O 20 Minutes
3
Freeze Protection Enabled
3
Frost Protection Setpoint -22°F [-30°C] -22°F [-30°C] 50°F [10°C]
3
Parallel Shift Value 0°F [0°C] 0°F [0°C] 144°F [80°C]
3
CH Call Blocking 2 Minutes 0 Minutes 30 Minutes
3
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