Weil-Mclain Ultra 155 Serie 1 Boiler Instruction Manual
Weil-Mclain Ultra 155 Serie 1 Boiler
Weil-Mclain Ultra 155 Serie 1 Boiler
Weil-Mclain Ultra 155 Serie 1 Instructions
Here we offer the Weil-Mclain Ultra 155 Serie 1 Boiler manual completely free and in English. We have cataloged this manual in the Boilers section on Manualverse, and it has been rated by 1 users with an average rating of 5. If you have any specific questions about Weil-Mclain Ultra 155 Serie 1 Boiler, we suggest checking the Frequently Asked Questions (FAQs) section of this manual.
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Weil-Mclain Ultra 155 Serie 1 Boiler Specifications
| Specification | Value |
|---|---|
| Model | Ultra 155 Serie 1 |
| Boiler Type | Gas-fired water boiler |
| Heat Exchanger Material | Cast aluminum |
| Ignition System | Automatic, non-pilot |
| Gas Input Capacity | 155,000 Btuh |
| Gross Output Capacity | 140,000 Btuh |
| Net I=B=R Rating | 122,000 Btuh |
| AFUE (Annual Fuel Utilization Efficiency) | 92.5% |
| Heating Capacity | 140 MBH |
| Water Content | 1.7 Gallons |
| Electrical Supply | 120 VAC, 60 Hz |
| Boiler Supply Tapping | 1" NPT |
| Boiler Return Tapping | 1" NPT |
| Gas Connection | ½" NPT |
| Operating Weight | 181 lbs |
| Vent Type | Category IV (Direct Vent, Pressurized, Condensing) - Refer to Ultra Vent Supplement for sizing |
| Clearances from Combustible Materials: | |
| - Front | 24 inches |
| - Top | 18 inches |
| - Side | 6 inches |
| - Rear | 0 inches |
| - Floor | 0 inches (approved for combustible floors, but not carpeting) |
Weil-Mclain Ultra 155 Serie 1 Boiler Details
The Weil-Mclain Ultra 155 Serie 1 Boiler incorporates advanced PhD Technology, which stands for Precision hydronic Data. This intelligent system continuously measures the parameters of your heating setup, enabling it to deliver precise hydronic heating and hot water while maximizing overall efficiency. It represents a significant leap in responsive and adaptive home comfort solutions.
Beyond its robust specifications, the boiler features an advanced blower design, complemented by an air inlet silencer, ensuring exceptionally quiet operation. For the Ultra 155 model, air flows through the enclosure and silencer, then mixes with gas in the venturi before the blower pushes this mixture into the burner, a distinct design from smaller models.
The integrated gas valve is designed for safety and efficiency, sensing the vacuum created in the venturi by the airflow. This ensures gas only flows when sufficient air is present and power is applied. A manual gas valve is also included for easy shut-off during servicing or extended shutdowns, enhancing operational safety and convenience.
A sophisticated array of sensors monitors critical operational parameters. This includes a flue gas sensor that safeguards against overheating of the flue pipe and heat exchanger, an outlet water temperature sensor for precise firing rate adjustments, and a return water temperature sensor that fine-tunes boiler input based on water temperature differentials.
User interaction is facilitated by a clear 4-digit electronic display and intuitive buttons. This interface allows users to set space heating temperatures, view real-time outlet water temperatures, monitor various operating conditions, and easily troubleshoot issues via boiler status and lockout codes. An on/off Power switch provides immediate control.
The boiler's high-grade stainless steel burner utilizes pre-mixed air and gas, providing a wide and responsive range of firing rates to meet varying heating demands effectively. Its robust construction ensures longevity and consistent performance, a core component of the boiler's efficient operation.
At the heart of its intelligence is the Control Module, a microprocessor-based electronic control. It intelligently responds to signals from the room thermostat, water sensors, flue sensor, and optional accessories like a domestic hot water (DHW) aquastat or outdoor temperature sensor. The module automatically modulates blower speed and gas flow to match heating demands.
Proper water chemistry is crucial for the longevity of the aluminum heat exchanger. The manual specifies maintaining water pH between 7.0 and 8.5, with hardness below 7 grains and chlorine concentration under 200 ppm. The system *must be thoroughly flushed* before operation to prevent sediment buildup, which can damage the high-efficiency heat exchanger.
For systems requiring freeze protection, the boiler offers internal safeguards: the circulator activates below 45°F, and the burner fires at low intensity below 37°F. However, this primarily protects the boiler itself, not the entire heating system. For comprehensive system protection, only approved freeze-protection fluids, as specified in the Ultra Boiler Freeze Protection Supplement, should be used.
The Ultra 155 Serie 1 also boasts an Outdoor Reset Operation feature. When the included outdoor temperature sensor is installed, the control module dynamically adjusts the target outlet water temperature based on external conditions, optimizing energy use. A 'Supply temperature boost' automatically increases the target if a continuous heat call exceeds 10 minutes, ensuring comfort during peak demand.
Domestic hot water (DHW) calls receive priority. The control module instantly shifts its focus, activating the DHW circulator and boosting the target outlet water temperature to 190°F for rapid hot water recovery. The space heating circulator is temporarily shut down during this period, ensuring maximum heating power is directed where it's most needed.
Safety is paramount, with advanced thermal overrun protection featuring two levels: a soft lockout at 203°F (auto-reset) and a hard lockout at 210°F (manual-reset) to prevent overheating. Additionally, low water protection is provided by monitoring supply and return temperatures, ensuring immediate shutdown in low flow conditions.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Weil-Mclain Ultra 155 Serie 1 Boiler, and we answer them below.
