Krom Schroder TZI5-15/100R Ignition Transformer
Order No. 84331382 | Part Number: TZI 5-15/100R
Product Overview
The Krom Schroder TZI5-15/100R (order number 84331382) is a high-voltage ignition transformer from the established TZI series, designed specifically for spark ignition of gas burners and gas-ignited or directly ignited oil burners in industrial and commercial combustion equipment.
This transformer steps up a 115V AC mains supply to a 5 kV high-voltage output, delivering 15 mA at 50 Hz - the optimal combination of voltage and current needed to generate reliable ignition sparks across properly gapped electrodes in fuel-air mixtures.
The 100% duty cycle rating distinguishes this unit from intermittent-rated alternatives, allowing continuous operation without mandated off-periods. This eliminates thermal failure modes that could limit service life under demanding firing cycles in burner control applications.
Technical Specifications
| Order Number |
84331382 |
| Model |
TZI 5-15/100R |
| Output Voltage |
5 kV |
| Output Current |
15 mA (at 50 Hz) |
| Mains Input Voltage |
115V AC |
| Duty Cycle |
100% (continuous) |
| Application |
Gas burners, oil burners (spark ignition) |
| Electrode Operation |
Single-electrode and double-electrode |
| Enclosure |
IP 00 - requires installation in control cabinet |
| Series |
TZI (Transformator Zundung Industrie) |
| Manufacturer |
Krom Schroder / Elster / Honeywell Combustion |
5 kV Output for Reliable Spark Ignition
The 5 kV output of the TZI5-15/100R is specifically engineered to break down electrode gap dielectrics and initiate sparks, while the 15 mA output current ensures sufficient energy for reliable fuel-air mixture ignition. This specification defines the operating envelope for proper electrode installation design.
100% Duty Cycle Benefits
Modern burner management systems with extended startup sequences, frequent cycling, or commissioning requirements benefit from the 100% duty cycle rating. Unlike intermittent-rated transformers with restricted on-times, this unit handles extended operation without thermal stress concerns, ensuring long service life in demanding applications.
Electrode Operation Modes
The TZI5-15/100R supports both double-electrode and single-electrode configurations. In single-electrode operation, the same electrode serves both ignition and ionisation functions, simplifying burner head construction and reducing combustion chamber penetrations for compact or retrofit applications.
Installation Requirements
As an IP 00 rated component, this transformer must be installed inside a suitable control cabinet. Use high-voltage ignition cable rated for at least 5 kV, keep cable runs as short as possible (typically under one meter), and route away from signal cables to minimize electromagnetic interference. Functional earthing of the burner body is mandatory for proper circuit completion.
Replacement Information
The current Krom Schroder equivalent is the TZI 5-15/100QT (order number 84391111), featuring the same 5 kV/15 mA/100% duty specification with 120VAC input and UL/CSA approval. For installations requiring exact 115VAC specification matching, surplus stock of the original TZI5-15/100R provides direct replacement compatibility.
Frequently Asked Questions
What is the difference between 100% duty cycle and intermittent duty ratings?
A 100% duty cycle allows continuous operation without required off-periods, while intermittent ratings (typically 20-30%) restrict on-time within defined cycles to prevent overheating. The 100% rating eliminates thermal stress in applications with frequent starts or extended ignition sequences.
Can this transformer be used for both gas and oil burner ignition?
Yes. The TZI series is rated for spark ignition of gas burners directly and for oil burners via pilot gas flame or direct spark ignition, depending on burner design. Proper electrode gap and positioning according to manufacturer specifications ensure reliable ignition.
What ignition cable should be used with this transformer?
Use high-voltage ignition cable rated for at least 5 kV, kept as short as possible (under one meter recommended) to minimize capacitive loading. Route away from signal wiring and use Krom Schroder's purpose-designed cable accessories for compliant installation.
Is burner body earthing required?
Yes. Functional earthing of the burner body is mandatory in both single and double electrode configurations to complete the high-voltage circuit. Without proper earthing, spark formation will be unreliable or non-existent.
What is the current replacement for the TZI5-15/100R?
The current-production equivalent is the TZI 5-15/100QT (order number 84391111), featuring identical specifications with 120VAC input and UL/CSA listing. For exact 115VAC specification matching, surplus stock of the original TZI5-15/100R provides direct compatibility.
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