trol operates the boiler burner to maintain the boiler
target at the boiler outlet sensor.
Mode 7
– Designed for an external input signal with
primary/secondary piping. The external input signal
can be provided from a BMS, an EMS or an external
control. The external input signal changes the boiler
target according to a linear scale (see Tables O & P).
The control operates the boiler burner to maintain the
boiler target at the system sensor. See Fig. 35.
32
Mode 4 (Not supported)
– Outdoor reset using pri-
mary piping. The heater is operated as in Mode 1.
However, the target temperature is based on outdoor
reset.
Mode 5
– Outdoor reset using primary/secondary pip-
ing. The heater is operated as in Mode 2. However, the
target temperature is based on outdoor reset. See Fig.
34.
Mode 6 (Not supported)
– Designed for an external
input signal with primary piping. The external input sig-
nal can be provided from a BMS, an EMS or a
sequencing control. The external input signal changes
the boiler target according to a linear scale. The con-
*
Fig. 35: Mode 7 Primary/Secondary Piping with
External Target Temp
*
Fig. 34: Mode 5 Primary/Secondary Piping with
Outdoor Reset
0-10 VDC
0-20 mA*
Boiler Target
0
0
--- (OFF)
1
2
50°F
2
4
68.9°F
3
6
87.8°F
4
8
106.7°F
5
10
125.6°F
6
12
144.1°F
7
14
163.3°F
8
16
182.2°F
9
18
201.1°F
10
20
220°F
Table O: 0-10 VDC or 0-20 mA External Input Signal
*Requires a 500Ω resistor.
ELECTRONIC
Fig. 33: Mode 3 Dedicated DHW
*Maximum 4 times the pipe diameter or 12”, whichever is less.
*Maximum 4 times the pipe diameter or 12”, whichever is less.
Summary of Contents for MVB H-1104
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