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21
P/N 032498h
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Step 5: Set the SMC55-HWQS Advanced Parameters to Modify the
Functionality of the HVAC System
(continued)
Table 16: Advanced Configuration Parameters for the SMC55-HWQS
(continued)
Applicable
Systems
Advanced
Configuration
Parameter
Name
Description
Default Value
Range
Heat
Pump
1
and
Conventional
78A
Aux / W
2
On
°F below setpoint to turn stage on. If auxiliary is stage 2, this
differential is used to turn on.
3 °F
1 °F – 10 °F
79A
Aux / W
2
Off
°F above setpoint to turn stage off. If auxiliary is stage 2, this
differential is used to turn off.
0 °F
1 °F – 10 °F
80A
Cool Stage 1 On
°F above setpoint to turn stage on.
1 °F
1 °F – 10 °F
81A
Cool Stage 1 Off
°F below setpoint to turn stage off.
1 °F
1 °F – 10 °F
82A
Cool Stage 2 On
°F above setpoint to turn stage on.
2 °F
1 °F – 10 °F
83A
Cool Stage 2 Off
°F below setpoint to turn stage off.
0 °F
1 °F – 10 °F
84A
Compressor
Cool Stage 2
Upstage Delay
Stage 2 cooling will not turn on until the first stage has run
for the chosen duration.
0: 0 minutes, 1: 1 minute, 2: 2 minutes, 3: 5 minutes,
4: 10 minutes, 5: 20 minutes, 6: 30 minutes, 7: 1 hour,
8: 2 hours, 9: 4 hours, 10: 8 hours, 11–99: 11–99 hours
0 minutes
0 – 99
minutes
85A
Compressor
Heat Stage 2
Upstage Delay
Stage 2 compressor heating will not turn on until the first
stage has run for the chosen duration.
0: 0 minutes, 1: 1 minute, 2: 2 minutes, 3: 5 minutes,
4: 10 minutes, 5: 20 minutes, 6: 30 minutes, 7: 1 hour,
8: 2 hours, 9: 4 hours, 10: 8 hours, 11–99: 11–99 hours
0 minutes, however
thermostat will default
based on stages
0 – 99
minutes
Heat
Pump
1
88A
Reversing
Valve Delay
(RVD)
Delay to wait for reversing valve to change over. When changing
between heat and cool, the thermostat will turn off the
compressor, then wait for MCOT. The thermostat will then change
the state of the O/B signal, and wait for the reversing valve delay
(RVD) before turning the compressor and fan back on.
1 second
0 – 99
seconds
Radiant
Floor
1
90A
Slab Maximum
If slab temperature rises above this maximum, must turn off
regardless of air temperature.
85 °F
0 – 120 °F
91A
Slab Minimum
If slab temperature falls below this minimum, must turn on
regardless of air temperature.
60 °F
0 – 120 °F
92A
Floor 100%
Differential
Temperature
°F below the setpoint to turn on system to 100%.
2.0 °F
0 – 20 °F
93A
Floor 0%
Differential
Temperature
°F above the setpoint to turn on system to 0%.
2.0 °F
0 – 20 °F
94A
Cycles Per Hour
Cycles per hour (CPH).
3 (20 minute signal period)
1-20 CPH
1
Included with SMC55-HWQS version 7420 or newer and HomeWorks Palladiom Thermostat version 1.10 or newer.