Platinum 1050
11-HD15D1-5-EN 25
current outdoor conditions.
•
Air Flow Modulation
•
The indoor blower speed is controlled based on
the type of equipment installed and the air flow
capabilities of the calling zones…insert chart
•
Air flow modulation does not apply during gas
furnace heating or electric heat operation
COOLING MODE
System Type
AF Range 1st Stg
AF Range 2nd Stg
Single Stg ODU + VS IDU
N/A
70-100%
2-stg/2-comp ODU + VS IDU
35-50%
70-100%
2-stg/1-comp ODU + VS IDU
55-80%
70-100%
VS ODU + VS IDU
30%
1
31-100%
HEATING MODE
System Type
AF Range
1st Stg
AF Range
2nd Stg
AF Range
w/Elect Ht
Single Stg ODU + VS IDU
N/A
70-100%
100%
2-Stg/2-Comp ODU + VS IDU
35-55%
70-100%
100%
2-Stg/1-Comp ODU + VS IDU
55-80%
70-100%
100%
VS ODU + VS IDU
30%
2
31-100%
100%
2-Stg VS Gas Heat
65-80%
100%
N/A
Modulating VS Gas Heat
40%
3
41
3
-100%
N/A
Electric Heat
N/A
N/A
100%
Hydronic VS Heat
35%
36-100%
N/A
1
Minimum air flow percentages may be higher during oil return mode
2
Minimum air flow percentages may be higher during oil return mode
or during cold outdoor ambient temperatures
3
45% for 120K models
If the 1050 Control still calculates excess air, then the
excess will be relieved following the rules below:
•
Relief Strategy 1
Divide the excess air evenly between the zones which
are calling but their dampers are not 100% open
•
Relief Strategy 2
Divide the remaining excess air evenly between
the zones which are in the same calling mode but
have zero load value (zones in the “OFF” mode are
considered same calling mode zones)
•
Relief Strategy 3
Divide the remaining excess air evenly between the
zones which are in the opposite mode regardless of
load value
Note
- The minimum damper position when a zone is
relieving is 25%.
Relief Strategy
The relief strategy employed by the 1050 successfully
manages excess air without affecting the efficiency or
reliability of the applied heating/cooling system. Zone(s)
may overshoot their setpoint if the system is not applied
properly. Common application mistakes which cause
zone(s) to overshoot:
1. Too many zones applied for the equipment selected
2. Disproportionate sized zones (one large zone and one
small zone)
3. Zone branch ducts undersized (zone branch ducts
should be sized based on the peak load of the rooms
in the zone)
Follow the guidelines detailed in the Application Guide
CNT-APG003-EN to ensure zoning success.
.
