York J Series - Fig. 21 - Mod-Dcu Architecture

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JOHNSON CONTROLS

66

FORM 100.50-NOM7 (808)

Service

FIG. 21 – MOD-DCU ARCHITECTURE

Hot Water

Stat

Change Over

Relay Status

LOWER RIGHT -HAND CORNER OF MOD-DCU

Safety

CKT 1

Safety

CKT 2

Safety

CKT 3

Emergency

Stop

Smoke

Purge

Air Proving

Switch

Flame

CKT 1

Flame

CKT 2

Filter

Switch

Evap Freeze

Stat

Flame

CKT 3

G

Input

DCC/UNDCC

Input

VFD

Bypass

LD07636

Table of Contents

Nomenclature4
Table of Contents5
List of Figures7
List of Tables8
Acronym Chart8
Section 1 - Installation9
- General9
- Field Wiring9
Fig. 1 - Field Control Wiring11
Fig. 2 - Optilogic Control Panel12
Fig. 3 - Trap Detail for Draw through Application14
- Unit Checks - Power Applied15
- Initial Start-Up15
- Gas Heat Models "Staged15
- Gas Heat Models "Modulating16
Section 2 - Start-Up14
- Checking the System Prior to Initial Start (no Power)14
Section 3 - Sequence of Operation17
- Compressor Staging17
- Table 1 - 25 - 40-Ton R410A Compressor Logic17
- Compressor Average Run Times18
- Supply Fan Operation18
- Timeouts and Delays19
- Constant Volume Sequence of Operation19
- Table 2 - Timeouts and Delays19
Fig. 4 - CV Space Sensor Cooling Algorithm - Economizer Not Suitable21
Fig. 5 - CV Space Sensor Cooling Algorithm - Economizer Suitable21
Fig. 6 - CV Space Sensor Stepped Heat Algorithm22
Fig. 7 - CV Space Sensor Hydronic Heat Algorithm22
- Table 3 - Modes of Operation23
- Variable Air Volume Sequence of Operation24
Fig. 8 - Vav Occupied Heating to Maintain Rat and Morning Warm up25
Fig. 9 - Vav Unoccupied Stepped Heating Temperature Control25
Fig. 10 - Vav Unoccupied Cooling Temperature Control26
Fig. 11 - Compressor Staging for Vav Cooling26
Fig. 12 - Occupied Heating and Cooling Setpoint Selection Algorithm27
- Table 4 - Vav Modes of Operation28
- Economizer Operation29
- Ventilation Option Operation30
Fig. 13 - Oad Minimum Position Reset31
- Controlling Excessive Supply Air Temperature Sat32
- Power Exhaust Operation33
Fig. 14 - Oad Position Control33
Fig. 15 - Building Pressure Control33
- Time Clock / Scheduling34
Fig. 16 - Exhaust Proportional Band34
Fig. 17 - Exhaust Fan Control, Proportional Option34
- Changeover Relay Operation35
- Comfort Ventilation Operation35
- Hot Water Freeze Protection Using RA Operation36
- Smoke Purge Operation36
Section 4 - Menu Navigation and Display Descriptions38
- Optilogic TM Control Center38
- Navigating the Menus38
- History Menu Navigation38
- Unit Status" Navigation38
- Operation Data" Navigation42
- Setpoints" Navigation45
- Unit Setup" Navigation45
- Configuration" Navigation47
- Service" Navigation48
- History" Navigation50
- Table 5 - History Function Text (Line 2)51
- Table 6 - History Points Data List51
Section 5 - Parameter Descriptions and Options52
- Parameter Description and Options (Setpoints)52
- Status Key Parameters52
- Setpoint Key Parameters52
- Unit Setup Key Parameters53
Fig. 18 - Oda Damper Position Vs. Vav Supply Fan Output53
- Configuration Key Parameters58
- Service Key Parameters59
- Changing "Setpoints60
- Passwords61
- Table 7 - Setpoints and Values62
Section 6 - Service64
Fig. 19 - Mod-Dcu Controller64
Fig. 20 - Mod-Dcu Connection Map65
Fig. 21 - Mod-Dcu Architecture66
Fig. 22 - Binary Led Designations67
- Binary Input Operation68
- Analog Input Operation71
- Table 8 - Temperature Sensor Resistance Table71
- Table 9 - *Duct Pressure Transducer Output Table71
Table 10 - Building Pressure Transducer Output Table72
Fig. 24 - Mod-Unt Wiring Diagram72
Fig. 23 - Mod-Unt72
Table 11 - Humidity Sensor Output73
Table 12 - Co Sensor Output73
Table 13 - Thermostat Interface Board Voltage Outputs74
Table 14 - Thermostat Interface Board Connections75
Fig. 25 - Thermostat Interface Board (Optional)75
- Table 15 - Input/Output Table76
- Fault Descriptions77
- Table 16 - Monitor and Control I/O from Mod-Dcu78
- Table 19 - Fault Descriptions Table79
- Wiring Diagrams84

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