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Operating Sequence
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal
1
Operation - Y1
Normal
2
Operation - Y2
Normal
1
Operation
2
Call
Normal
1
Operation
2
Call
1
Call Only
Normal
1
Operation
2
Call
Normal
1
Operation
2
Call
1
Call Only
With Condensing unit - Y2 and R to O
With Heat Pump - none
060 units.
Table 5. NAMV1
Page 20 of 24
System Demand
Thermostat Demand
Y1
Y2
O
G
W1
On
On
On
On
On
On
On
Room Thermostat Calls for First-Stage Cooling
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Room Thermostat Calls for First- and Second-Stage Cooling
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Thermostat and Two-Stage Outdoor Unit Operating Sequence
Relative Humidity
W2
Status
D
24
Accetpable
VAC
24
Accetpable
VAC
24
Accetpable
VAC
24
Demand
VAC
24
Acceptable
VAC
0
Demand
VAC
0
Demand
VAC
24
Accetpable
VAC
0
Demand
VAC
24
Accetpable
VAC
0
Demand
VAC
0
Demand
VAC
Issue 2336
System Response
Air Handler
Comp
CFM
Compressor and indoor
thermostat demand
High
Thermostat energizes
Y2 and de-energizes
D on a call for
High
greater than setpoint
High
maintain room humidity
High
the room space to
maintain a cooler room
thermostat setpoint**
Thermostat energizes
High
Y2 and de-energizes
D on a call for
High
High
greater than setpoint
High
High
maintain room humidity
the room space to
maintain a cooler room
thermostat setpoint**
507789-02G / 31-5000673-1
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