Orbit Irrigation Products

1 Introduction

1.1 Product Objective

The HT31BT will provide a lineup of B-hyve products capable of control at the device, as well as expanded and smart controls through the B-hyve app.

2 General Overview and Design Guidelines

2.1 Assumptions / Constraints / Standards

• At device interface
• Bluetooth connection capabilities
• Encoder equipped timer
• Device controls: Single start time per port, Intervals: 1 hr, 3 hr, 6 hr, 12 hr, 1 day – 7 day
• App controls: Days of the week programming, Smart watering if paired with a hub
• At least one season (8 months) of use on a single set of batteries with 5 cumulative cycles per day

3 System Design

3.1 System Components

• Nordic nRF52833 Bluetooth chipset
• Rotary Encoder: 12-position, used to select mode, toggle selection, adjust time
• Encoder Button: Confirms selection
• Station Button: Switches programming selections between ports (for multiple port timers only)
• Valve drive system: Reverse flow with latching valve
• Solenoid: Latching solenoid with reinforcement off pulse
• Power system: Detects low voltage situations
• Segmented LCD: Provides visual feedback to user

3.2 Device User Interface Inputs/Outputs

3.2.1 Power up/Battery installation

• Upon initial power, an "OFF" pulse is sent to each valve.
• All settings are cleared and reset.
• Clock time resets to 1:00 PM.
• Start times are cleared.
• Timer mode is in the "OFF" state.

3.2.2 LCD requirements

• Mode: Positive image
• Type: TN Reflective
• Duty: 1/4
• Bias: 1/3
• Segments: 47
• Size: 2.5"
• Aspect Ratio: 4:3
• Viewing Direction: 12:00
• Viewing Angle: 45°
• Operating Temperature: -20°C to 70°C
• Storage Temperature: -25°C to 80°C
• Pin connection to PCB

3.2.3 Encoder Requirements

• Index: 12
• Detent Force: Yes
• Push button included

4 Electrical and Firmware

4.1 General Electrical Requirements

• Input: Nominal 3V with 2x 1.5V AA Alkaline Batteries.
• Unit to last a minimum of one watering season (or 8 months of normal operation at 5 watering cycles/day, ~1500 cycles) on a single set of batteries.
• Low battery indication at 2.6V (±0.1V) threshold.
• Auto valve shut-off at 2.4V (±0.1V) threshold.
• Timer stays powered for 10s after battery removal for replacement without losing settings.
• Follow standard battery fitment guidelines ensuring correct orientation.
• PCB conformal coating with UV tracers required.
• Output Driving Solenoid Pulse: Operating Voltage: 19.9 V, Pulse Duration: 12mS minimum. Behavior: Reinforcement pulse required when turning the valve off.

4.2 General Firmware Requirements

• Fast Clock Mode: Device must operate in "fast mode" for accelerated testing (1 real-time minute = 1 hour).
• Fast clock mode initiated via button configuration (maintaining IP rating).
• Firmware version displayed on power-up during fast clock mode for 2 seconds.

5 Mechanical

5.1 General Workmanship Standard

All units tested must meet requirements per section 6.4 of QA-60.

5.2 Threads

• All GHT and BSP threads must meet standard (tested with appropriate go/nogo thread gauge).
• Threaded inlet connection is a brass swivel with TPR overmold.

5.3 Environmental Requirements

• Maximum operating humidity: 90% RH at 100°F for 24 hours.
• Operating Temperature: 0°C to 70°C (32°F to 158°F).
• Storage Temperature: -20°C to 80°C (-4°F to 176°F).
• External surfaces UV resistant to withstand outdoor sunlight exposure without fading or degradation (Reference ASTM G154).
• Corrosion resistance: Metal components must withstand 24 hours in 5% salt spray (fog) without major corrosion or visual degradation (Reference ASTM B117).

5.4 Working Pressure

• Valves must function properly at pressures from 10 psi to 100 psi (static) without leakage or performance degradation.
• Valves open and close cleanly under pressures: 10 psi, 25 psi, 50 psi, 75 psi, and 100 psi.
• Valves operate at working pressures when open to atmosphere.
• Valve operates at the above conditions restricted with a 1mm diameter outlet cap.

5.5 Proof Pressure

Timer must withstand a static pressure of 150 psi (150% of max working pressure) without catastrophic failure. Valves will meet Working Pressure requirements post-test.

5.6 Burst Pressure

Timer assemblies shall withstand a minimum burst pressure of 700 psi.

5.7 Flow Throughput

All valves must meet the following flow requirements to open atmosphere provided the static head:

Note: Test system must have an unrestricted outlet flow capacity exceeding 15 GPM.

5.8 Full Cycle Function Testing

Timer must operate properly through the full range of programs. A sampling of programs will be tested for ability to turn on and off properly.

5.9 Product Life

• Each valve to reach a minimum of 1,200 cycles by means of actuation at 100 PSI static with a water supply temperature range of 40°F to 80°F.
• After 1,200 cycles, units will still meet Environmental Requirements and Standard Performance Requirement for Working Pressure.

5.10 Ingress Protection Rating

Valves will have no water ingress onto the PCB or other electrical components and will meet working pressure requirements immediately after being subjected to IPX5 testing (Reference IEC: 60529 standard).

5.11 Swivel Strength

• Swivel will withstand a moment of 200 in*lbs with force direction perpendicular to axis of hose swivel.
• Swivel to withstand an axial load of 200lbs.
• Swivel to withstand being torqued to hose tap fixture to 15in*lbs and be removed without degradation to performance.

5.12 Ergonomics

• Orbit logo on the valve side will be TPR.
• Encoder knob will be textured to provide a more ergonomic grip.

6 Regulatory and Safety

6.1 General

• Product Must Conform to QA-060, General Workmanship Standard.
• IEC 60730 compliance.

7 Significant Modifications to the General Specification

Figure 1: Battery Tray Design Guideline

Diagram illustrating correct and reverse battery insertion. It shows an appliance with positive and negative contacts, and an insulator. The correct insertion shows the battery's positive terminal connecting to the appliance's positive contact, and the negative terminal to the negative contact. The reverse insertion shows the opposite, indicating an incorrect setup.

FCC Warning

This device complies with Part 15 of the FCC Rules. Operation is subject to two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and receiver; Connect the equipment into an outlet on a circuit different from that to which the receiver is connected; Consult the dealer or an experienced radio/TV technician for help. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body.

IC Warning

This device complies with Industry Canada's licence-exempt RSSs. Operation is subject to the following two conditions: (1) This device may not cause interference; and (2) This device must accept any interference, including interference that may cause undesired operation of the device. This equipment complies with ISED radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body. (French translation: This equipment is compliant with Industry Canada's license-exempt CNR. Its operation is subject to the following two conditions: (1) This device may not cause interference; and (2) This device must accept any interference, including interference that may cause malfunction of the device. This equipment is completed by ISED radiation exposure for a natural environment. This equipment must be installed and used with a minimum distance of 20cm between the radiators and your body.)