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Step 4: Set the SMC55-HWQS Basic Parameters for System
Compatibility
(continued)
(05b): Cool Stages
Applicable Systems:
Conventional and Heat Pump.
Use this parameter to select the number of cool stages. This parameter will be skipped in the menu if you select any option other
than ‘00: Conventional’ or ‘01: Heat Pump’ for the previous parameter (01b). Refer to your HVAC equipment installation manual or
label for the number of supported cool stages. The different options available for this parameter are listed in the table below:
Table 8: Values for Cooling Stages
Values for Cooling
Stages in 05b
Default Value
00: None
01: 1 stage
02: 2 stage
01: 1 stage
Refer to
Table 21
in
Appendix A
for the details about the different relays that get energized in the different cool stages for Heat
Pump and Conventional systems.
(06b): Heat Fan Control
Applicable System:
Conventional systems with at least one heat stage.
Use this parameter to specify if the SMC55-HWQS should turn on the fan when turning on the heat. For some HVAC system
types, a control signal for the fan is not needed from the SMC55-HWQS because the equipment automatically turns the fan
on when there is a call for heat. In such cases ensure that AUTO is enabled in the available Fan Modes in the HomeWorks QS
designer software.
This parameter will be skipped and will default to have the fan turn on with the heating if you select a system type that is not
conventional or has no heating stages. Refer to your HVAC equipment manual and HVAC equipment label to identify the type of
conventional system. The different options available for this parameter are listed in the table below:
Table 9: Values for Heat Fan Type
Values for 07b
Default Value
00: Equipment controls the fan relay
01: Thermostat controls the fan relay
01: Thermostat controls the fan relay
(07b): Changeover/Reversing Valve (O/B) Type
1
Applicable System:
Heat Pump.
Use this parameter to select the type of reversing valve: energize for heating or energize for cooling. This parameter will be
skipped in the menu if you select any option other than ‘01: Heat Pump’ for the previous parameter (01b). Refer to your HVAC
equipment manual to identify the type of reversing valve (O/B). The different options available for this parameter are listed in the
table below:
Table 10: Values for Different Types of Reversing Valves
Changeover/Reversing Valve
(O/B) Type (07b)
Default Value
00: Energize for cooling (O)
01: Energize for heating (B)
00: Energize for cooling (O)
1
Included with SMC55-HWQS version 7420 or newer, SMC55-RESI version 7302 or newer and HomeWorks Palladiom Thermostat version 1.10 or newer.
