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RTU Open 45
The cooling relays are controlled by the Cooling Control PID Loop and Cooling Stages Capacity algorithm. They
calculate the desired number of stages needed to satisfy the space by comparing the
Space Temperature
to
the:
•
Effective Occupied Cooling Setpoint
when occupied
•
Effective Unoccupied Cooling Setpoint
when unoccupied
When the cooling algorithm preconditions have been met, the compressors are energized in stages, as
applicable. Anti-recycle timers are employed to protect the equipment from short-cycling. There are fixed
three-minute minimum on-times, and five-minute off-times for each compressor output.
During compressor operation, the RTU Open may reduce the number of active stages if the rooftop supply air
temperature falls below the
Minimum Cooling SAT Setpoint
. A compressor staged off in this fashion may be
started again after the normal time-guard period has expired, if the
Supply Air Temperature
has increased
above the
Minimum Cooling SAT Setpoint
.
Compressor 2 Service Alarm Timer
functions are available (one for each stage of compression). This function
tracks the number of compressor run hours and generates an alarm when the accumulated runtime exceeds
the threshold set by the adjustable compressor service alarm timers.
Economizer
The RTU Open provides an analog economizer output for rooftop units with economizer dampers. Economizer
dampers may be used to provide indoor air quality control and free cooling when outside air conditions are
suitable.
The following conditions must be true for economizer operation:
• The
Outdoor Air Temperature
is less than the
Space Temperature
and less than the
Economizer High
OAT Lockout Temp
setpoint
• The indoor fan has been on for at least 30 seconds
• The unit has a valid
Supply Air Temperature
input
• The unit has a valid
Space Temperature
input
If any of the preceding conditions are not true, the economizer will be set to the
Vent Dmpr Pos / DCV Min
Pos
setpoint.
If all preceding conditions are true, the economizer PID loop will modulate the damper from the
Vent Dmpr
Pos / DCV Min Pos
setpoint.
The economizer moves to the
Vent Dmpr Pos / DCV Min Pos
setpoint if the SAT falls below the
Minimum
Cooling SAT
(+ 5°F).
- Table of Contents 3
- Table of Contents 5
- RTU Open iii 5
- Introduction 7
- 2 RTU Open 8
- Specifications 9
- Safety considerations 10
- Installation 11
- To mount the RTU Open 12
- RTU Open 9 15
- 10 RTU Open 16
- Wiring specifications 17
- Wiring inputs and outputs 18
- Input wiring specifications 19
- Analog output 20
- To wire inputs and outputs 20
- Binary outputs 20
- J4 Inputs 22
- J5 Inputs 22
- J11 Outputs 23
- Wiring sensors to inputs 24
- RTU Open 19 25
- Wiring an SPT sensor 26
- RTU Open 21 27
- Wiring a CO2 sensor 30
- 26 RTU Open 32
- Wiring a Humidistat 34
- Wiring an enthalpy switch 35
- RTU Open 31 37
- Wiring a status switch 38
- Wiring a compressor safety 39
- RTU Open 35 41
- Start-up 42
- Service Test 43
- Setpoint properties 46
- 42 RTU Open 48
- Sequence of Operation 49
- Supply fan 50
- Cooling 50
- Economizer 51
- Power Exhaust 52
- Unoccupied Free Cooling 52
- Optimal Start 52
- Enthalpy control 53
- Indoor Air CO2 53
- Heating 54
- Heat Pump operation 55
- Dehumidification 55
- Demand Limiting 56
- Door contact 56
- Remote occupancy 56
- Fire Shutdown 56
- Compressor Safety 56
- Fan Status 57
- Filter status 57
- 52 RTU Open 58
- Linkage 59
- 54 RTU Open 60
- Linkage Air Source Modes 61
- Troubleshooting 62
- RTU Open 57 63
- Compliance 64
- Unit Configuration 66
- RTU Open 61 67
- 62 RTU Open 68
- Setpoints 69
- 64 RTU Open 70
- RTU Open 65 71
- 66 RTU Open 72
- Alarm Configuration 73
- Service Configuration 74
- RTU Open 69 75
- Maintenance 76
- 72 RTU Open 78
- I/O Points 79
- 74 RTU Open 80
- Single Point Linkage 81
- Device Address Binding 82
- Index 83
- RTU Open 77 83
- 78 RTU Open 84
- RTU Open 79 85
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