Watts PVi CEN 1600 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The PVI Centurion modulating and condensing water heater is an advanced hydronic system designed for high efficiency and environmental compliance, suitable for both natural gas and propane gas. It features an Edge® [ii] Controller for precise operation, adjustment, and troubleshooting.

Function Description:

The Centurion water heater modulates its energy input to match fluctuating system loads, ensuring high efficiency. It can be used in singular or modular arrangements and supports various vent configurations, including Room Combustion Air (Vertical/Horizontal Discharge) and Ducted Combustion Air (Vertical/Horizontal Discharge). The internal recirculation water loop, with a recirculation pump, provides feed-forward temperature control by mixing hot water outlet with cold water inlet, allowing the Edge Controller to modulate the fire rate and maintain the selected setpoint temperature.

Important Technical Specifications:

Models: CEN 2000 and CEN 1600
Input Range (BTU/HR):
- CEN 1600: Minimum 100,000 (29.3 kW), Maximum 1,600,000 (470 kW)
- CEN 2000: Minimum 100,000 (29.3 kW), Maximum 2,000,000 (586 kW)
Output Range (BTU/HR):
- CEN 1600: Minimum 90,000 (26.4 kW), Maximum 1,504,000 (441 kW)
- CEN 2000: Minimum 90,000 (26.4 kW), Maximum 1,920,000 (563 kW)
NOx Emissions: Complies with South Coast Air Quality Management District (SCAQMD), Rule 1146.2 (<20 ppm).
Vent Systems: Capable of being vented using PVC, CPVC, Polypropylene, and AL29-4C.
Flue Pitch: Must be pitched back towards the unit a minimum of 1/4" per foot (0.64 cm per 0.3 m) to avoid condensate pooling.
Maximum Equivalent Vent Length: Combined pressure drop of vent and combustion air systems must not exceed 140 equivalent feet (42.7 m) or 0.8” W.C. (199 Pa).
Gas Inlet Pressure (Natural Gas):
- Standard Gas Trains: 4.0” W.C. (1.00 kPa) to 14.0” W.C. (3.49 kPa)
- DBB Gas Trains: 4.5” W.C. (1.12 kPa) to 14.0” W.C. (3.49 kPa)
Gas Inlet Pressure (Propane Gas):
- Standard Gas Trains: 8.0” W.C. (2.00 kPa) to 14.0” W.C. (3.49 kPa)
- DBB Gas Trains: 8.0” W.C. (2.00 kPa) to 14.0” W.C. (3.49 kPa)
Manifold Gas Pressure @ 100% Fire Rate:
- Natural Gas: 1.6” ± 0.1” W.C. (0.40 ± 0.02 kPa) for CEN 2000; 1.7” ± 0.1” W.C. (0.42 + 0.02 kPa) for CEN 1600.
- Propane Gas: 1.9” ± 0.1” W.C. (0.47 ± 0.02 kPa) for both CEN 2000 and CEN 1600.
Electrical Power Options:
- 208 V, 3Ø / 60 Hz, 20 Amps
- 460 V, 3Ø / 60 Hz, 15 Amps
Condensate Flow Rate: Maximum 16 gallons (60 liters) per hour.
Temperature Setpoint: Adjustable from 60°F to 170°F (15.6°C to 76.7°C).
Over-Temperature Limit Switches:
- Automatic Reset: Adjustable from 32°F to 190°F (0°C to 87.8°C), default 160°F (71.1°C).
- Manual Reset: Preset to 200°F (93.3°C).
Shipping Weight: Approximately 1,850 lbs (839 kg).
Clearances: Front: 24 inches (61 cm), Sides: 24 inches (61 cm), Rear: 24 inches (61 cm), Top: 18 inches (45.7 cm). Zero side clearance allowed in pairs.

Usage Features:

Edge Controller: A touchscreen display with indicators and buttons for operating, adjusting, and troubleshooting. It provides multi-function bar displays (Fire Rate, Valve Position), configurable temperature read-outs (Inlet/Setpoint, Outlet/System Header), and operation mode indicators (Demand/Manual, Manager/Client).
Password Protection: Multiple levels of access (No password, Routine maintenance, Master Technicians) to prevent unauthorized changes.
Start Sequence: Includes checks for high water temperature, high/low gas pressure, low water level, and Safety Shut-Off Valve (SSOV) Proof of Closure (POC) switches. Initiates a purge cycle, followed by spark cleaning and ignition.
Start/Stop Levels: Factory preset Air/Fuel Valve positions for starting (24%) and stopping (18%) the unit, and ignition (35%).
Operating Modes:
- Constant Setpoint Mode: Allows users to set a desired temperature for standalone units.
- Remote Setpoint Mode: Adjusts the setpoint based on a remote signal (e.g., 4-20 mA, 1-5 V, BAS, Network, 0-20 mA, 0-5 V, PWM Input).
Water Heater Management (WHM): For multiple units, it stages and coordinates up to 16 Centurion water heaters to maximize operational efficiency. The WHM Manager monitors Air/Fuel Valve position and accumulated operating time to balance system load and ensure equal run time.
Auto-Manager Transfer: Automatically transfers WHM Manager functionality to a backup unit if the current Manager fails or loses power.
O2 Trim System: Measures and maintains an ideal air/fuel ratio to maximize efficiency and reliability while minimizing emissions, adjusting blower voltage within a limited range based on O2 sensor readings.

Maintenance Features:

Maintenance Schedule: Regular routine maintenance is required for efficiency and reliability, with specified intervals for inspection and replacement of components.
- 6 Months (initial startup only): Igniter-Injector, Flame Detector, O2 Sensor inspection and calibration, Combustion Calibration, Safety Device Testing, Condensate Drain Trap inspection.
- 12 Months: Igniter-Injector, Flame Detector, O2 Sensor inspection/cleaning/calibration, Condensate Drain Trap inspection/cleaning/gasket replacement, Air Filter cleaning.
- 24 Months: Igniter-Injector, Flame Detector, Burner, Condensate Drain Trap inspection/cleaning/gasket replacement, Air Filter replacement.
Maintenance Kits: Available for 12-month and 24-month maintenance, including parts like ignitor, flame rod, O-rings, burner/blower gaskets, and air filter replacements/cleaners.
O2 Sensor Calibration: Initiated via the Edge Controller, requiring a combustion analyzer to ensure accuracy and adjust for environmental variations.
Troubleshooting Tables: Detailed fault indications, probable causes, and corrective actions are provided in the manual to aid service/maintenance personnel in isolating and correcting issues.
Safety Device Testing: Periodic testing of operating controls and safety devices is required to ensure proper functioning, conforming to local codes like ASME CSD-1. This includes tests for low/high gas pressure, low water level, water temperature faults, interlocks, flame faults, and airflow faults (blower proof & blocked inlet switches).
Extended Shutdown Procedure: Instructions for shutting down the water heater for one year or more, including draining all water to prevent heat exchanger damage.