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Emergency procedures for gas leaks, including turning off supply, extinguishing flames, and ventilating.
Instructions for handling flame burn-back incidents, including immediate shutdown and reignition steps.
Specifies the required operating pressure of 2.8 kPa and compliance with SANS 1237 for regulators.
Information on product registration requirements using invoice and Certificate of Compliance (COC).
Identification of controller box, LCD screen, pilot assembly, pilot jet, pilot tube, and gas valve.
Identification of battery box, jet bar test point, burner washer, and burner components.
Identification of various temperature sensors (85°C, 110°C, outlet) and the water flow sensor.
Identification of cover, chimney box, radiator, and inlet water valve components.
Unit maintains set water temperature regardless of flow or inlet temperature changes.
Controller remembers previous temperature settings, improving startup reaction time.
Allows simple adjustment of hot water temperature in 1°C increments via a button.
Pilot ignites first, then main burner, with pilot shutting off to save gas.
Can be used with solar water heaters to boost temperature in colder months.
Automatically cuts off gas if flame/burner extinguishes or sensor fails.
Activates from a water flow of 3lt/min, suitable for low pressure applications.
Protects unit by releasing pressure if supply exceeds 10 Bar, or prevents freezing damage.
Adjusts gas usage based on water usage for improved efficiency.
Ensures adequate air supply to prevent fire, explosion, or asphyxiation risks.
Warning against handling, using, or storing combustible materials near the geyser.
Guidance on using weather boxes and flues for proper operation and warranty.
Advises considering safety and energy savings when setting temperature; burn risks above 52°C.
Details time-temperature exposure limits to prevent severe burns from hot water.
Steps to take if a gas leak is detected, emphasizing evacuation and contacting professionals.
Requirements for flue installation, cowls, and preventing rain entry.
Guidelines for securely mounting the geyser to the wall using appropriate fixings.
Specifies requirements for clean, potable water free from contaminants and scale.
Recommendations for optimal placement, considering ventilation and clearances.
Specifies the minimum required water pressure (14 psi) and flow rate (2.5 L/min) for operation.
Mandates leak testing of the geyser and its connections at operating pressures before first use.
Strict prohibition against using open flames for gas leak detection due to severe safety risks.
Prohibits connecting to existing vents; requires separate venting for the geyser.
Specifies a minimum 1-meter clearance from any venting system during installation.
Explains that insufficient water flow prevents the geyser from igniting.
Recommends installing a pressure regulating valve for balanced water pressure.
Suggests using demountable fittings for easier servicing and disconnection of water lines.
Advises regular inspection of gas pipes and hoses for secure joints and cracks.
Procedure to turn off the gas shut-off valve in case of specific incidents or failures.
Warning against accumulating flammable materials like paper or rags near the appliance.
Prohibition of storing or using flammable liquids and vapors near the gas appliance.
Recommends shutting off nearby appliances to prevent ignition of vapors by the gas burner.
Instructions for adjusting the OPV by unscrewing the grubscrew until water drips out.
Step-by-step guide for inserting the D cell battery into the battery box, noting polarity.
Instructions to open the cold water valve or main water supply before operation.
Guidance on opening the gas cylinder and shut-off valves to supply gas to the unit.
Explains that temperature is adjustable via the digital control panel settings.
Recommendation for initial temperature setting (40-45°C) to maximize efficiency.
Critical safety instruction prohibiting indoor installation of the gas appliance.
Warning against using the geyser in areas lacking adequate air circulation.
Immediate action required upon detecting a gas leak: turn off the gas valve.
Advice to turn off gas supply and geyser when leaving for extended periods.
Caution that the geyser body can become hot during operation and should not be touched.
Prohibition of inserting foreign objects into the geyser's exhaust or air inlet.
Guidance on identifying abnormal combustion (yellow flame) and immediate corrective actions.
Instruction to drain the geyser in freezing temperatures to prevent damage.
Explains temperature regulation is done via the front control panel settings.
Mentions that mixers can also be used to adjust water temperature at the outlet.
Clarifies that peak water temperatures are achieved when the burner is active.
Instructions to use UP/DOWN arrows on the control panel to set desired temperature.
Details that temperature adjustments are made in 1°C increments using control buttons.
Advice to set temperature to minimize the need for adding cold water, saving gas.
Provides initial temperature setting recommendations based on pipe run length (e.g., 42°C for <3m).
Notes that water temperature is highest at the tap nearest to the gas geyser.
Emphasizes testing water temperature by hand and warns hotter settings increase injury risk.
Explains the safety feature that shuts off gas if temperatures exceed 75°C.
States the minimum water flow rate (3 L/min) required for the appliance to function.
Suggests professional maintenance ensures longevity and problem-free operation; periodic checks advised.
Warning against operating if issues are suspected and prohibiting children from handling the appliance.
Instructs to verify proper operation by turning on the hot water tap after maintenance.
Recommends specific cleaning and sealing for electronic contacts in coastal areas.
Instruction to clean appliance and remote using only a damp soft cloth; avoid chemicals.
Advises against storing items on the unit and not removing labels during service.
Step-by-step guide for cleaning the water filter: turn off, remove, clean, reassemble, turn on.
Specifies that main burner cleaning must always be performed by a Registered LPG Installer.
Recommendation for annual visual inspection of main burners and checking for clean flame.
Instruction to check air supply and vent terminal for blockages or debris.
Procedures for extended shutdowns: turn off power/gas, drain unit if freezing risk exists.
Symptom: Pilot ignites but ignitor keeps ticking, indicating a fault.
Symptom: Pilot ignites but no flame, E1 error, and gas smell, indicating sensor issue.
Symptom: Unit fires continuously without flame or error, suggesting a faulty controller.
Symptom: Faint firing with PA, BA, or 6A codes indicates flat batteries.
Symptom: Flame ignites, heats, then drops away and attempts reignition, possibly due to panel/box issues.
Symptom: Low temperature output (35-38°C) may indicate high water flow or undersupply of gas.
Symptom: Erratic temperature fluctuations suggest a faulty flow sensor.
Symptom: Pilot fires but main burner does not, indicating a faulty gas section or wiring.
Symptom: Unit becomes cold during use due to flat batteries or high gas pressure.
Symptom: Unit resets to 45°C, possibly due to high water pressure spikes or high pre-set temperature.
Symptom: Unit repeatedly fires and fails, indicating a faulty gas section wiring loom.
Initial steps for handling displayed error codes: turn off, remove battery, wait, then reopen.
If errors persist, turn off, note code, and contact technical service.
Procedure for persistent errors: turn off, note action, and attempt operation again.
Safety warning: Do not attempt repairs; only a Registered LPG Installer should perform them.
Error E0: Accidental flameout, sensor failure. Check gas pressure, sensor, or controller.
Error E1: No flame signal detected. Check gas pressure, sensor, pilot tube, or controller.
Error E2: 20 min shut off. Normal operation: close and re-open tap.
Error E4: Flame signal without water flow. Check gas pressure, valve, and perform pressure test.
Error E5: Faulty output water temp sensor. Check sensor connection or replace.
Error E6: Sensor short circuit or temp over 85°C. Check pressure, flow, or sensors.
Error E7: Gas flow unstable, switched off 5 times. Check gas pressure, controller, or batteries.
Error E8: Low water flow (<3L/min) or overheat sensor open circuit. Check pressure or valve.
Error EA: Open circuit of input water temperature sensor. Check wire or replace sensor.
Error EB: Damaged controller CPU. Change loom, LCD screen, or controller.
Error EE: Controller malfunction. Replace the controller unit.
Indicator LED FLASH signifies flat batteries. Replace batteries.
Indicators PA, BA, 6A signify low battery. Replace batteries.
User ensures installation by registered LPG installer, receives briefing and COC.
Installer must comply with SANS 10087-1, provide briefing and Certificate of Compliance.
This document describes a Dewhot 16lt Constant Temperature gas geyser, an appliance designed for on-demand hot water supply, primarily for outdoor installation and operation with LPG. The manual emphasizes safety, proper installation, and maintenance to ensure efficient and long-lasting performance.
The Dewhot 16lt Constant Temperature gas geyser provides a continuous supply of hot water at a consistent temperature. It is designed to operate on LPG (Liquefied Petroleum Gas) and is specifically manufactured for outdoor installation. The appliance features a digital display that allows users to set and maintain the desired water temperature automatically, regardless of changes in water flow or incoming water temperatures.
Key operational features include:
The Dewhot gas geyser is designed for straightforward use, with a focus on safety and efficiency.
Regular maintenance is essential for the safe and efficient operation of the Dewhot gas geyser.
General| Model | NDCT16DH |
|---|---|
| Category | Water Heater |
| Brand | Dewhot |
| Type | Tankless |
| Temperature Control | Digital |
| Power | 16 kW |
| Installation Type | Wall-mounted |
| Safety Features | Overheat Protection |
| Water Flow Rate | 8 L/min |
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