Base Mounting and Physical Positioning
The GST DI-9101E Intelligent Combination Heat Photoelectric Smoke Detector is engineered for surface or flush ceiling installation utilizing the GST DB-01 Standard Base (Product No. 30205764) or the compatible DC-9504E Diode Base. The DB-01 base mounts directly to standard European embedded electrical back boxes with mounting hole spacing between 45 mm and 75 mm, secured by two tapping screws. The physical assembly has an overall diameter of 100 mm and a combined height of 54.5 mm with an approximate weight of 110 g. The ABS enclosure is IP2X rated and designed strictly for indoor commercial, institutional, and industrial fire alarm networks.
When positioning the detector, spatial design must comply with relevant fire safety engineering standards, such as EN 54-14 Annex A.6.4. For the optical smoke detection element, the unit provides an effective operating coverage radius of 7.5 meters beneath flat ceilings at heights below 25 meters. The installation environment must remain within the operating temperature envelope of -10°C to 50°C and a relative humidity threshold not exceeding 95% (non-condensing).
Loop and Remote Indicator Terminal Wiring
Field wiring requires a minimum conductor cross-section of 1.0 mm² or above fire-rated cable laid through grounded steel conduit or flame-retardant rigid conduit in accordance with local fire alarm wiring codes. The DB-01 mounting base incorporates a 4-terminal layout providing polarity-insensitive signal loop connection and supervised auxiliary outputs:
- Terminals 1 & 3 (Loop In / Loop Out): Non-polarized connections for the addressable detection loop, operating across a nominal loop voltage of 24V DC (allowable input range: 16V DC to 28V DC). Polarity independence prevents circuit faults caused by reversed field wiring.
- Terminal 2 (Remote Indicator +): Positive polarized connection for driving an external indicator such as the GST C-9314P Remote Indicator. Contains an internal 10 kΩ series resistor delivering a 2 mA drive current.
- Terminal 4 (Remote Indicator -): Negative polarized return terminal for the remote indicator output. Dedicated cable color differentiation is recommended for external indicator circuits to prevent site termination errors.
Head Mechanical Alignment and Dust Protection
Once the base is secured and field wiring is completed, attach the DI-9101E detector head using the integrated directional alignment indicators. Position the detector over the base and align alignment mark A located on the detector body with mark B on the DB-01 base. Push the detector head inward and rotate it clockwise until mark A aligns flush with mark C on the base, locking the electrical contacts firmly in place.
Each detector is shipped with a factory dust-proof cover. This cover must remain fitted throughout the entire construction, painting, and pre-commissioning phase. Removing the cover prematurely exposes the removable optical-heat sensing chamber to airborne particulate contamination, which can compromise optical baseline calibration and trigger unwanted false alarms. The protective dust cover must only be removed immediately prior to commissioning and operational handover.
Electronic Addressing and Pre-Commissioning Verification
Before putting the loop into service with compatible GST fire alarm control panels (including GST100, GST200N, GST-IFP4E, and GST-IFP8), each detector must be electronically addressed within the range of 1 to 242 using the GST P-9910B Handheld Programmer (Product No. 10104894). The device does not use manual DIP or rotary switches. Factory configuration defaults to Parameter Code 1 (Smoke Sensitivity Level 1 [0.084 dB/m to 0.162 dB/m, EN 54-7 compliant], Class A2R Rate-of-Rise heat detection with a 62°C action threshold, and an active red 360° polling LED). In applications where polling LED flashes cause visual distraction, commissioning engineers can configure the programmer to Parameter Code 129 (Level 1 sensitivity) or Parameter Code 130 (Level 2 sensitivity) to disable the polling pulse while retaining full continuous alarm illumination.
Initial commissioning acceptance requires verified operational testing using either a commissioning magnet placed against the magnetic test zone for reed switch activation, a smoldering cotton rope for smoke chamber verification, or an industrial heat source directed at the Class A2R thermistor.
