Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of the Napco Gemini P816 Security System Kit. This kit is designed to provide reliable security for your premises.
The kit includes the P816 security control panel in an enclosure, an alphanumeric keypad (GEM-RP1CAe2), and a step-down transformer. Please read this manual thoroughly before attempting any installation or operation.
Components Overview

The Napco Gemini P816 Security System Kit comprises the following primary components:
- P816 Security Control Panel: The central processing unit of the security system, housed within a protective enclosure.
- GEM-RP1CAe2 Alphanumeric Keypad: Used for system arming/disarming, programming, and status display. Features an LCD screen for clear messages.
- Step-Down Transformer: Provides the necessary power supply to the control panel.
Setup and Installation
Proper installation is crucial for the reliable operation of your security system. It is recommended that installation be performed by a qualified security professional.
1. Mounting the Control Panel
- Select a secure, dry, and accessible location, typically in a utility closet or basement.
- Ensure the location is close to an AC power outlet and away from excessive heat or moisture.
- Mount the enclosure securely to a wall using appropriate fasteners.
2. Wiring the Keypad
- Connect the keypad to the control panel using appropriate wiring (refer to the wiring diagram in the full technical manual for specific terminal connections).
- Ensure all connections are secure and correctly polarized.
3. Power Connection
- Connect the step-down transformer to the designated AC input terminals on the control panel.
- Plug the transformer into a non-switched AC outlet.
- Connect the backup battery (sold separately) to the control panel's battery terminals.
Note: Always disconnect AC power and battery before servicing the control panel.
Operating Instructions
Arming the System
To arm the system, enter your 4-digit user code followed by the ARM key. The keypad will display "ARMED" and the exit delay countdown will begin.
Disarming the System
To disarm the system, enter your 4-digit user code. The keypad will display "DISARMED". If an alarm occurred, the keypad will indicate the zone that triggered the alarm.
Bypassing Zones
To bypass a zone (e.g., a window you wish to leave open), enter your user code, then press the BYPASS key, followed by the 2-digit zone number. Press ENTER to confirm. Bypassed zones will not trigger an alarm when the system is armed.
Checking System Status
Press the STATUS key to view the current status of the system, including open zones or system troubles.
Maintenance
Regular maintenance ensures the longevity and reliability of your Napco Gemini P816 system.
- Battery Replacement: The backup battery should be tested annually and replaced every 3-5 years, or when the system indicates a low battery trouble condition.
- Keypad Cleaning: Use a soft, dry cloth to clean the keypad. Avoid abrasive cleaners or excessive moisture.
- System Testing: Periodically test your system with your monitoring station (if applicable) to ensure all sensors and communication paths are functioning correctly.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Keypad displays "AC Loss" | No AC power to the control panel. | Check if the transformer is plugged in and the outlet has power. Check circuit breaker. |
| Keypad displays "Low Battery" | Backup battery is weak or disconnected. | Test or replace the backup battery. Ensure battery terminals are securely connected. |
| System won't arm | An open zone exists (door/window open). | Check keypad for open zone indications. Close all protected doors and windows. Bypass problematic zones if necessary. |
| False alarms | Faulty sensor, improper installation, or environmental factors. | Identify the zone causing the alarm. Inspect the sensor for damage or obstruction. Consult a professional for persistent issues. |
Specifications
- Model Number: 816PREMPAK
- Control Panel: Napco Gemini P816
- Keypad: GEM-RP1CAe2 Alphanumeric Keypad
- Dimensions (Product): 3.74 x 12.99 x 11.77 inches (Control Panel Enclosure)
- Weight (Product): Approximately 1 Pound
- Manufacturer: Napco Security Systems
- Date First Available: January 24, 2011
Warranty Information
Napco Security Systems products are covered by a limited warranty. For specific warranty terms and conditions, please refer to the documentation included with your product or visit the official Napco Security Systems website. Keep your proof of purchase for warranty claims.
Customer Support
For technical assistance, troubleshooting beyond this manual, or service inquiries, please contact Napco Security Systems customer support. Contact information can typically be found on the manufacturer's website or on the product packaging.
Online Resources: www.napcosecurity.com





