Weil-McLain Understanding Weil McLain Modulation and Lockout Features for Superior Hydronic Systems

PhD Technology - Precision Hydronic Data

An intelligent system that delivers Precision Hydronic heating and hot water needs while maximizing efficiency by measuring and responding to the Data parameters of your heating system.

PhD Technology is built around proven key components that when combined make the Ultra the most advanced, reliable and efficient boiler available.

The key components

include...

A negative regulated gas valve that

Precisely delivers gas to the boiler;

A variable speed motor that matches combustion output to your heating needs;

A venturi mixing body that Precisely mixes air and gas providing higher efficiency;

System intelligence with the Ultra Control Module which maintains proper, efficient and Precise Hydronic heat through inputs of all system Data;

A cast aluminum mono block heat exchanger designed to operate in low temperature condensing applications;

Pre-mix stainless steel burner designed for perfect firing rate modulation, efficiency, clean combustion and quiet operation.

The cast aluminum heat exchanger features	High grade stainless steel burner with woven
a mono block design. This low mass heat	steel fiber mesh.	Burner uses pre-mixed
exchanger heats faster, providing heat to the	air and gas providing for a 20% to 100%
system quicker. This aluminum block has	modulating firing	rate. The Ultra burner
been specifically designed to work in low	features long life, quiet operation, high
return temperature applications in condensing	efficiency and cleaner combustion for low
mode.	NOx applications.

The Ultra Control Module, a microprocessor electronic control, responds to signals from the room thermostat, supply water temperature sensor, return water temperature sensor, flue temperature sensor, domestic hot water aquastat, summer/winter switch and outdoor temperature sensor. The module automatically adjusts blower speed and gas flow rate to modulate boiler firing rate to closely match boiler output for space heating or DHW heating demand.

The blower, gas valve and venturi all work in concert to provide the proper fuel and air mixture for precise combustion. The blower pulls in air and gas through the venturi. The air and gas mix inside the blower and are pushed into the burner for combustion. The gas valve senses suction from the blower, allowing gas to flow only if combustion air is flowing and proper combustion is achieved.

The 4-digit electronic display with programming buttons and data port make entering and receiving information very easy. There are two levels of information: User Level and Contractor Level. The User Level is used to: Turn space and DHW heating “on” or “off”; set space heating temperature and boiler circulator operation; display soft and hard lockout codes for easy troubleshooting. The Contractor Level is accessible through the use of a special code that is entered through the front panel or with a computer interface control kit and a laptop computer. This access can be used to customize the Ultra boiler to each specific job application. Adjustments can be made for high altitude, outdoor reset, boost timing and much more...