Installing the GST DI-9103E Intelligent Rate of Rise and Fixed Temperature Heat Detector requires mounting the passive DB-01 common detector base, terminating field loop wiring, assigning an electronic address, and locking the detector head into position. Designed for commercial and industrial fire alarm installations, the combined unit provides an IP2X degree of protection with an overall profile measuring 100 mm in diameter and 53.3 mm in height.
Mechanical Base Mounting
The DB-01 base (measuring 100 mm in diameter and 14 mm in height, weighing approximately 55 g) serves as the mechanical conduit mount and electrical junction point. Moulded from flame-retardant white ABS polymer rated to UL 94 V-0, the base contains no active internal electrical components. Slotted mounting holes support hole spacing between 45 mm and 75 mm, accommodating standard electrical conduit back boxes, ceiling plates, or surface-mount junction fixtures.
When positioning the base, ensure the surface is flat and free of debris that could distort the ABS moulding. For installations requiring localized fault segmenting on the addressable line, the DI-9103E detector head is alternatively compatible with the DC-9504E base mount isolator in place of the standard DB-01 base.
Field Cabling and Terminal Terminations
Loop infrastructure requires fire-rated 2-core cable with a minimum cross-sectional conductor area of 1.0 mm². For loops extending up to 1500 meters, 1.5 mm² cross-sectional area cabling is recommended. The DB-01 common base is fitted with four screw terminals numbered 1 through 4:
- Terminals 1 and 3 (Non-Polarized Loop): Connect incoming and outgoing 24VDC addressable loop wiring (allowable operating voltage range: 16VDC to 28VDC). Non-polarized design prevents commissioning faults caused by reversed loop cores.
- Terminal 2 (Remote Indicator Positive): Connects to the positive (+) lead of an external C-9314P remote indicator.
- Terminal 4 (Remote Indicator Negative): Connects to the negative (-) lead of an external C-9314P remote indicator. Reverse polarity on terminals 2 and 4 will prevent external indicator actuation during fire alarm conditions.
| Terminal Marking | Polarity | Function | Connected Peripheral / Circuit |
|---|---|---|---|
| Terminal 1 | Non-polarized | Addressable Signaling Loop | Loop In / Loop Out (GST Panel Line) |
| Terminal 2 | Polarized (+) | Auxiliary Output Positive | Remote Indicator C-9314P Positive |
| Terminal 3 | Non-polarized | Addressable Signaling Loop | Loop In / Loop Out (GST Panel Line) |
| Terminal 4 | Polarized (-) | Auxiliary Output Negative | Remote Indicator C-9314P Negative |
Electronic Address Configuration
The DI-9103E detector head uses electronic digital addressing and must be programmed in the field prior to final insertion onto the base. Using the dedicated GST P-9910B handheld programmer, the commissioning engineer assigns an address code within the range of 1 to 242. Address verification prevents duplicate address allocation, which produces loop device collision errors at the fire alarm control panel (such as the GST-IFP8, GST200-2, GST200N, or GST100 series).
During field programming with the P-9910B programmer, the operational behavior of the red 360-degree LED can also be configured. By default, the LED pulses periodically during loop communication polling and latches continuously red in alarm. For locations where intermittent flashing is undesirable, the programmer can configure the polling LED mode to closed (off during standby).
Final Assembly and Commissioning
Align the detector head markings with the DB-01 base tabs and rotate clockwise until the internal locking mechanism seats against the conductive metal base contacts. The assembled detector weighs approximately 110 g.
Before functional testing, the addressable loop must be continuously energized at operating voltage (16VDC to 28VDC) for a minimum stabilization period of 10 seconds. In standby mode, the detector head draws ≤0.6mA quiescent current. Commissioning engineers can verify alarm signaling (≤1.5mA without remote indicator, ≤3.5mA with remote indicator) via two methods:
- Magnetic Reed Switch Verification: Hold a dedicated GST magnetic commissioning tool against the designated testing area on the detector body for several seconds until the red 360-degree LED illuminates continuously and the control panel registers an alarm.
- Direct Thermal Functional Testing: Direct a controlled warm air source (such as a heat gun or hair dryer) toward the external thermistor element to trigger the programmed EN 54-5 thermal curve (Class A1R rate-of-rise, Class A2S fixed threshold, or Class BS high-temperature fixed threshold).
