Display Menu Guide │ Vmax I&O Manual
CH setpoint differential – establishes how much the boiler outlet temperature must exceed the CH
setpoint before the burner is turned off. Also establishes how much the boiler outlet temperature must
drop below the CH setpoint before the burner is turned on. Range = 3 to 36⁰F
CH mode – determines the operational mode for central heating:
0 – no outdoor sensor is needed; central heat demand is generated by a thermostat call to
boiler terminals 7 and 8. Boiler operates to setting 2-01; there is no outdoor reset.
1 – outdoor sensor is needed; central heat demand is generated by a thermostat call to boiler
terminals 7 and 8. Boiler operates in-between settings 2-01 and 2-05 depending on OD temp.
2 – outdoor sensor is needed; central heat demand is generated when the OD temp is below
the Warm weather shutdown setting (2-04). Boiler operates in-between settings 2-01 and 2-
05 depending on OD temp. An optional “nighttime setback” or “time of day” switch can be
applied to terminals 7 and 8; contact closure initiates “Night Setback Mode”, where the boiler
target temperature is reduced by the Night Setback Temperature setting (2-33).
3 – same as 0
4 – setpoint from external analog input (0-10VDC); 2 volts for minimum CH setpoint, 10
volts for maximum CH setpoint. Use of an addition interface board through Argus Link is
required.
5 – modulation from external analog input (0-10VDC); 2 volts for minimum modulation, 10
volts for maximum modulation. Use of an addition interface board through Argus Link is
required.
Warm weather shutdown – inhibits central heat operation when the outdoor temperature reading goes
above this setting. Range = 35 to 100⁰F
CH setpoint (at OD = 70⁰F) – establishes the boiler operating temperature during central heat
demands when the outdoor temperature is 70⁰F or greater. Set to the minimum desired boiler
temperature for the application, e.g. 70-90⁰F for infloor; 100-120⁰F for cast-iron; 110-140⁰F for
baseboard. Range = 60 to 140⁰F
Temperature boost – determines the increase in boiler target temperature for every 15 minutes of
continuous central heat demand. Only applicable when an outdoor sensor is used (i.e. CH modes 1 &
2). Target temperature will not exceed CH setpoint setting 2-01. Range = 0 to 36⁰F
NOTICE: Boost feature does not function when the boiler is operating as part of a cascade.
DHW setpoint – establishes: a) tank temperature setting for DHW mode 1 [e.g. 130-140⁰F], when
using a tank sensor, or b) boiler outlet setpoint for DHW mode 2 [e.g. 170-190⁰F]. Note: Vmax Plus
models must have DHW mode = 1, i.e. Tank sensor. Range = 104-190⁰F
DHW mode – determines the operational mode for DHW; for VM110 and VM153 models choose
between options 0, 1 and 2; for VM110P and VM153P models choose between options 0 and 1:
0 – off; boiler will not attempt to heat DHW in any way.
1 – control anticipates a reading from a Tank Sensor wired to terminals 3 and 6; tank
temperature is controlled by the boiler via setting 2-07 (mandatory for VM110P and
VM153P).
2 – control anticipates an open/closed input from a tank thermostat wired to boiler terminals 3
and 6. Setting 2-07 determines boiler outlet temperature during DHW demands. (Default
setting for VM110 and VM153 – not applicable for VM110P and VM153P models)
3, 4 & 5 – settings are not applicable for Vmax boilers.
DHW priority timer – a timer that accumulates during a simultaneous DHW and CH demand. Each
time the timer exceeds the “DHW priority timer” setting, the priority switches from one demand to the
other (i.e. DHW to CH). Note: DHW is assigned priority first. Range = 1-240 minutes
Preheat mode – Not Applicable for Vmax boilers
Appliance selection (type) – indicates what boiler model the controller is configured to operate with:
8 = VM110 (NG)
9 = VM110P (NG)
12 = VM110 (LP)
13 = VM153 (LP)
(See Section 17.0 for instruction on changing the appliance selection {type}).
8, 9, 10,
11, 12,
13, 14 or
15
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