CRAC Buddy

iPhone: open this page in Safari, tap Share, then Add to Home Screen. Once installed, it opens like a standalone app.

Identify the unit first, then enter conditions, then view results.

CRAC Buddy Inputs

How do you want to identify the unit?

Model / Nameplate Identification

Enter Model Number

Take or Choose Nameplate Photo

Type a model number, take a new nameplate photo, or choose an existing photo from your device. Automatic text recognition depends on browser support; manual entry always works.

Current iCOM Temperature Settings

Enter the values currently programmed in the unit’s iCOM controller. These are the settings CRAC Buddy will use to calculate expected operation.

iCOM Temperature Set Point (TSP °F)

iCOM Temperature Proportional Band (TPB °F)

iCOM Temperature Dead Band (TDB °F)

iCOM Heater Dead Band (HDB °F)

Cooling Unit & Configuration

Cooling Unit Category Model Type

Model Type filters compressor/reheat choices using Vertiv unit-family documentation. Exact availability can still depend on capacity, voltage, heat-rejection type and factory configuration.

Unit Size / Model Cooling Type

SELECTED UNIT

No unit selected yet

Use either identification method above. You only need one.

Current Room Conditions

Enter what the unit is sensing right now. These are live room readings, not iCOM set points.

Current Room Temperature (°F)

Current Room RH (%)

Current iCOM Humidity Settings

Enter the humidity values currently programmed in iCOM.

iCOM Humidity Set Point (%)

iCOM Humidity Proportional Band (%)

iCOM Humidity Dead Band (%)

Proportional RH control: iCOM divides both the humidity proportional band and humidity dead band evenly around the humidity set point.

Installed Reheat Configuration

Installed / Selected Reheat Type

Reheat is filtered by the selected unit. Factory configuration can vary, so verify installed hardware.

Refrigeration Measurements

Enable Refrigeration Analysis

Refrigerant

Outdoor Ambient (°F, optional)

Suction Pressure (PSIG)

Suction Line Temp (°F)

Liquid Pressure (PSIG)

Liquid Line Temp (°F)

Refrigerant is selected automatically from the identified unit. R-407C uses dew point for superheat and bubble point for subcooling.

PI / Integration Time — Optional

Enable PI / Integration Analysis

Integration Time (minutes)

Current CCB Position (%)

Used only for PI analysis. It does not alter the normal cooling/reheat staging calculations.

Actual Unit Operation

Enable Expected vs Actual Diagnostics

What is the cooling system doing now? What is reheat doing now?

Enter the controller values, then press Calculate. Dead band may be entered as 0. Results are rounded to one decimal place.

How the calculator treats the bands

Cooling base = TSP + 50% TDB
Cooling band width = 50% TPB
100% cooling = TSP + 50% TDB + 50% TPB

Reheat base = TSP - 50% TDB - 100% HDB
Reheat band width = 50% TPB

Select or identify a unit to begin

CRAC Buddy will not show calculated equipment operation until a valid model and unit size are selected.

Calculated Results

Expected Current Operation

Enter values and calculate

Reheat—

Dehumidification—

Humidification—

Cooling Base—

100% Cooling—

Reheat Base—

100% Reheat—

Cooling sequence

Direction	CCB Point	Temperature	Action	Capacity / State

Live Cooling Staging Diagram

Dehumidification / Reheat Status

Room RH—

Dehum Status—

Room Temp—

Reheat Output—

Condition	Value	Meaning

Humidity calculations use the iCOM proportional humidity-control method: half the humidity proportional band and half the humidity dead band are placed on each side of the humidity setpoint. Dehumidification cooling starts at 100% dehumidification requirement and, once active, continues until demand returns to 0%.

Refrigeration Diagnostics

Refrigeration analysis is optional and currently disabled.

Suction Saturation—

Superheat—

Liquid Saturation—

Subcooling—

Item	Measured / Calculated	Reference	Assessment

PI / Integration Time

Integration Time—

Current CCB—

Seconds / +1%—

Time to 100%—

Elapsed Time	Added Demand	Estimated Total Demand	Meaning

Expected vs Actual

Enter actual unit operation and press Calculate.

System	Expected	Actual	Assessment / What to Check

Use this as a calculation/reference aid. Always verify the actual iCOM configuration, control program, software revision, sensor reading, compressor sequencing and unit-specific service documentation before diagnosing hardware.