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P/N 032498h
Step 5: Set the SMC55-HWQS Advanced Parameters to Modify the
Functionality of the HVAC System
(continued)
Parameters Applicable for Radiant Underfloor Heating System
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(continued)
Parameter details
(54A) Minimum Pulse Width
The lowest valve on-time allowed. This determines the low-end point of the straight-line curve for valve duty cycle.
(90A) Slab Maximum
This parameter indicates the maximum temperature in Fahrenheit of the radiant floor after which the underfloor heating system
stops heating irrespective of the indoor air temperature.
(91A) Slab Minimum
This parameter indicates the minimum temperature in Fahrenheit of the radiant floor below which the underfloor heating system
starts heating irrespective of the indoor air temperature.
(92A) Floor 100% Differential Temperature
Use this parameter to indicate the temperature in Fahrenheit below the heat setpoint when the underfloor heating system is at
maximum capacity.
(93A) Floor 0% Differential Temperature
Use this parameter to indicate the temperature in Fahrenheit above the heat setpoint when the underfloor heating system is at
minimum capacity.
(94A) Cycles Per Hour (CPH)
Use this parameter to indicate the total number of heating / cooling cycles per hour. For example, setting this parameter to
3 cycles per hour indicates a 20 minute cycle.
Parameters Applicable for 0–10 V
-
Fan Coil Units
This section lists out the details of the advanced configuration parameters applicable to 0–10 V
-
Fan Coil Units.
(50A) Proportional Fan Minimum
This parameter indicates the minimum percentage output for the fan to turn on. Below this value the fan will remain off.
(51A) Proportional Fan Low Speed
This parameter indicates the percentage output required to set the manual fan speed to ‘Low’.
(52A) Proportional Fan Medium Speed
This parameter indicates the percentage output required to set the manual fan speed to ‘Medium’.
(53A) Proportional Fan High Speed
This parameter indicates the percentage output required to set the manual fan speed to ‘High’.
(54A) Minimum Valve Percent Open
This parameter indicates the minimum percentage of output required to open the valves.
(55A) Valve Fully Open Differential
This parameter indicates the temperature offset from the deadband in Fahrenheit at which the valves are completely open.
(56A) Non-proportional Analog Output
This parameter indicates whether or not the valves follow non-proportional 0–10 V
-
output. Set this parameter to ‘01’ if enabling
non-proportional analog output for valves. When enabled, only two analog output values are used, 0 V
-
and 10 V
-
.
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Included with SMC55-HWQS version 7420 or newer and HomeWorks Palladiom Thermostat version 1.10 or newer.
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