Dometic ProHeat T-II 7-Day Digital Timer
The ProHeat T-II 7-Day Digital Timer is a programmable heater controller designed for compatible Dometic ProHeat coolant heaters.
It allows the heater to start automatically at scheduled times so the engine and coolant system can be warmed before the vehicle is needed. The operator can also start the heater manually whenever scheduled operation is not required.
The T-II improves heater control with automatic 12V/24V operation, LCD diagnostic-code display, lockout capability, and adjustable manual runtime.
Key Features
- Genuine Dometic ProHeat heater controller
- T-II 7-Day Digital Timer
- 7-day programmable operation
- Automatic 12V / 24V compatibility
- Single- and dual-timer programming
- Up to two programmed start times per day
- Selectable timed heater operation
- Manual heater ON/OFF control
- Adjustable maximum manual runtime
- 12- or 24-hour clock display
- Programmable schedules retained in memory
- Heater diagnostic codes displayed on the LCD
- Lockout capability
- Multiple mounting options
- Compatible with supported ProHeat timer applications
Programmable Heater Operation
The T-II allows the heater to operate automatically according to a programmed weekly schedule.
This is useful for vehicles that need to be warmed before a predictable start time, including:
- Work trucks
- School buses
- Transit vehicles
- Heavy equipment
- Fleet vehicles
- Other ProHeat-equipped applications
Instead of requiring an operator to manually start the heater well before departure, the timer can initiate the heating cycle automatically.
Single Timer Mode
Single-timer operation allows one programmed heater start time to be set for the selected schedule.
This works well when the vehicle typically requires one scheduled preheat period.
Dual Timer Mode
Dual-timer operation provides T1 and T2 programmed start times, allowing as many as two scheduled heater starts in a day.
This is especially useful for vehicles with multiple predictable operating periods, such as a school bus that requires preheating before both morning and afternoon routes.
Manual Heater Control
The T-II also allows the operator to start the ProHeat heater manually.
This makes it possible to operate the heater outside the programmed schedule whenever additional engine or coolant heating is needed.
Unlike the earlier timer design, the T-II allows the maximum manual operating time to be configured, helping prevent the heater from being unintentionally left operating for an extended period.
Automatic 12V / 24V Operation
The T-II is designed for use with both 12V and 24V ProHeat systems.
Voltage selection is automatic, eliminating the manual voltage-selection process required by earlier timer designs.
This makes the T-II easier to install and reduces the possibility of incorrect voltage configuration.
LCD Heater Diagnostics
One of the major advantages of the T-II is its ability to display heater diagnostic codes directly on the LCD screen.
Depending on the connected ProHeat heater, diagnostic information can assist with troubleshooting conditions involving systems such as:
- Heater startup
- Flame detection
- Coolant flow
- Overheat protection
- System voltage
- Temperature sensing
- Fuel delivery
- Compressor operation
- Ignition
- Coolant pump operation
- Combustion blower operation
- Sleeper-fan control
Displaying the code directly on the timer gives operators and technicians easier access to heater diagnostic information.
Lockout Function
The T-II includes a lockout function that can be used to restrict access to timer programming and settings.
This can be useful in fleet applications where heater schedules or operating parameters should remain consistent rather than being changed by individual vehicle operators.
Clock and Schedule Memory
The timer provides a selectable:
- 12-hour clock display
- 24-hour clock display
Programmed operating schedules are retained in memory, helping preserve heater settings if vehicle power is interrupted.
Mounting Options
The ProHeat digital timer can be installed in several locations depending on the vehicle and dashboard configuration.
Factory mounting options include:
- Dash surface mounting
- Under-dash mounting
- Stud-mounted installation
- Installation in a standard 2-1/8-inch gauge opening
This gives installers flexibility when integrating the timer into different truck, bus, equipment, and specialty-vehicle interiors.
Timer Installation Kit
ProHeat documents the 961125K Timer Installation Kit for mounting the digital timer.
Installation hardware includes:
- 2 × #8 washers
- 2 × #8-32 hex nuts
- 1 × mounting bracket
- 2 × #8 × 1/2-inch self-tapping screws
- 2 × #8-32 × 1-inch socket-head studs
- 4 × Dual Lock fasteners
- 1 × backlight wire with connector
Verify the contents of the BTRAC-stocked timer package before stating that all installation hardware is included with the timer itself.
Installation Notes
Before installing the T-II timer:
- Disconnect power to the ProHeat heater
- Confirm the heater is compatible with the ProHeat timer system
- Choose an accessible mounting location
- Route wiring away from heat, sharp edges, and moving components
- Secure the wiring harness to prevent abrasion
- Verify all electrical connections before restoring power
- Set the clock and desired heater schedule
- Configure the preferred operating and lockout settings
- Test both programmed and manual heater operation after installation
Product Specifications
- BTRAC SKU: PK0001
- Manufacturer: Dometic ProHeat
- Manufacturer Part Number: PK0001-1
- Product Type: 7-Day Digital Heater Timer
- Timer Generation: T-II
- Programming: Single or Dual Timer
- Maximum Scheduled Starts: Up to 2 per day
- Manual Operation: Yes
- Adjustable Manual Runtime: Yes
- Clock Display: 12 or 24 Hour
- System Voltage: Automatic 12V / 24V
- Diagnostics: LCD Diagnostic-Code Display
- Lockout Function: Yes
- Program Memory: Yes
- Application: Compatible ProHeat heater systems
Related ProHeat Parts
- 961125K – Timer Installation Kit
- 939225K – Dual Lock Fastener
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