Installation
I/O Wiring & Sequence
MSV127 – HP 2STG
Sequence of operation
Occupied Mode: Setpoints will revert to those defined by occupied cooling and
heating setpoints
Occupied Override Mode: The system will revert to occupied mode for the duration
determined by the “OvrTime_Set AV27” parameter
On a call for cooling / System mode is Cooling or Auto and OAT>than the economizer
changeover value: Reversing valve will be set in cooling (default O setting). HPump
stages will be energized according to cooling demand AV7 as per % threshold values
to maintain room temperature. Heating outputs are not energized
On a call for cooling / System mode is Cooling or Auto and OAT<than the economizer
changeover value: HPump stages will be not be energized. Cooling will be provided
by modulating the economizer from it’s minimum position according to cooling
demand AV7. The supply temperature will be modulated between the economizer
center setpoint AV57 and the low limit setpoint AV58
On a call for heating / System mode is Heating or Auto : Reversing valve will be set in
heating / non energized (default O setting). HPump stages will be energized according
to heating demand AV6 as per % threshold values to maintain room temperature
Fan operation: Occupied mode the fan will follow the fan mode setting (MSV4 Fan
Mode). Fan On will make the fan run continuously during occupied hours. Fan Auto
will only energize the fan on a call for a heating or cooling stage to be energized
• Fan needs to be on
• Call For Cooling or Heating
at
least 180 seconds
• There is a 60 seconds
bet
ween each stages
Minimum value
CLG_Dem (AV.7)
1 stage ON
OFF
2 Heatpump stages cooling mode
2 stage ON
10
25
30
45
BO.2 ON
OFF
2 heatpump + 1 Aux heating stages
BO.3 ON
BO.4 ON
BO.5 ON
50
10
25
30
45
65
Minimum value
HTG_Dem (AV.6)
• Economizer OAT Changeover is set at:
AV29 OAT, Property ID 516, Index 2
• Free cooling authorized status on BV8
• Call For Cooling at least 180 seconds
CLG_Dem (AV.7)
100%
MinPos MSV30
Property ID 516 Index 1
Free cooling
AV.57
SAT_CTR_Set
Ex.: 70F
AV.58
SAT_LL_Set
Ex.: 55F
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