Operator interfaces technical guide 17 – WattMaster VAV System User Manual
Page 17
Operator Interfaces
Technical Guide
17
Setpoint Screen #5
WMVAV Spts ID 59
Both Heating/Cooling
Supply Control Use
Deadband Of.: xx
°
F
All heating and cooling stages are staged up and down based on the
Heating/Cooling Supply Control Staging Deadband setpoint that is en-
tered on this screen. The value that is entered here will be added to the
Supply Air Temperature Setpoint to determine the high end of the range
and subtracted from the Supply Air Temperature Setpoint to determine
the low end of the range. Staging of Heating/Cooling will occur above
and below this deadband range. When the temperature is within this
deadband range, no staging will occur.
Description
Minimum
Default
Maximum
Deadband
0
°
F
1
°
F
20
°
F
Setpoint Screen #6
WMVAV Spts ID 59
Morning WarmUp Setup
Target Temp: xx
°
F
Max Length.: xxx Min
If you need a Morning Warm-up period on your HVAC unit enter a
Target Temp you want the Return Air Temperature to achieve and the
Max Length of time you want to spend in warm-up mode trying to
achieve the target temperature. If you don’t need morning warm-up,
simply ignore the Target Temp setpoint and enter a ‘0’ for the Max
Length value.
Description
Minimum
Default
Maximum
Target Temp
50
°
F
72
°
F
90
°
F
Max Length
0
Min
60
Min
240
Min
Setpoint Screen #7
WMVAV Spts ID 59
Outdoor Air Lockouts
Cooling:.....: xx
°
F
Heating:.....: xx
°
F
If the Outdoor Air Temperature drops below the Cooling lockout set-
point by 1°F, the DX cooling will be locked out until the Outdoor Air
Temperature rises 1°F back above the lockout setpoint. The same 1°F
deadband applies to the Heat lockout setpoint except the Outdoor Air
locks out the heating when it is above the lockout instead of below the
lockout.
Description
Minimum
Default
Maximum
Cooling
-30
°
F
50
°
F
80
°
F
Heating
50
°
F
75
°
F
90
°
F
Setpoint Screen #8
WMVAV Spts ID 59
All Cooling Cuts Off
If Supply Air Temp
Drops Below: xx
°
F
If the Supply Air Temperature ever drops below this value, all cooling
stages are immediately cutoff, regardless of run time. If the economizer
is being controlled, it is also closed completely to prevent freezing.
Description
Minimum
Default
Maximum
Low Cutoff
30
°
F
40
°
F
60
°
F
Setpoint Screen #9
WMVAV Spts ID 59
All Heating Cuts Off
If Supply Air Temp
Exceeds....: xxx
°
F
If the Supply Air Temperature ever exceeds this value, all heating stages
are immediately cutoff, regardless of run time.
Description
Minimum
Default
Maximum
High Cutoff
60
°
F
170
°
F
250
°
F