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CHAPTER 13
CHAPTER 13 - EXTERNAL MODULATING CONTROL
The EXALT 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 CTRL-
Max control module, as shown in Fig. 33 on page 49.
This signal will both enable and modulate the boiler. No
wiring is required at the thermostat terminals.
External modulating control will only function if the
external modulating controller is properly wired to the
EXALT 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. CTRLMax Programming
The CTRLMax control module must be programmed
to accept the 0-10 VDC signal from the external
modulating boiler control.
1. Use the Heating EZ Setup function to set
CH Demand to 0-10V Modulation Signal. Reference
Section 9.7 on page 56.
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.
CTRLMax Factory Settings
HEATING SETTING
FACTORY DEFAULT
MINIMUM
SETTING
MAXIMUM
SETTING
EZ SETUP RESET INSTALLER RESET
EXALT Solo EXALT Combi
Heating Operation Enabled Enabled
✓
Demand Type
Thermostat &
Outd. Curve
Thermostat &
Outd. Curve
✓ ✓
Absolute Max CH Setpoint 185°F [85°C] 185°F [85°C] 68°F [20°C] 188°F [87°C]
✓
CH1 Maximum Setpoint 180°F [82°C] 180°F [82°C] 68°F [20°C] 188°F [87°C]
✓ ✓
CH1 Minimum Setpoint 80°F [27°C] 80°F [27°C] 60°F [15°C] 188°F [87°C]
✓ ✓
Outdoor Curve Coldest Day 10°F [-12°C] 10°F [-12°C] -30°F [-34°C] 50°F [10°C]
✓
Outdoor Curve Warmest Day 64°F [18°C] 64°F [18°C] 60°F [15°C] 78°F [25°C]
✓
CH2 Circuit Enabled Enabled
✓
CH2 Maximum Setpoint 140°F [60°C] 140°F [60°C] 68°F [20°C] 194°F [90°C]
✓ ✓
CH2 Minimum Setpoint 80°F [27°C] 80°F [27°C] 60°F [15°C] 190°F [88°C]
✓ ✓
Warm Weather Shutdown O O O 78°F [25°C]
✓ ✓
Circulation Pump Permanent Disabled Disabled
✓
CH Post Pump Time 5 Minutes 5 Minutes O 20 Minutes
✓
Freeze Protection Enabled Enabled
✓
Frost Protection Setpoint -22°F [-30°C] -22°F [-30°C] -22°F [-30°C] 50°F [10°C]
✓
Parallel Shift Value 0°F [0°C] 0°F [0°C] 0°F [0°C] 144°F [80°C]
✓
CH Call Blocking 2 Minutes 2 Minutes 0 Minute 30 Minutes
✓
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