Coleman Commercial Product Tony Landers Commercial Marketing Manager – Unitary Products

MagnaDRY Product Availability Features & Benefits Technical Details

MagnaDRY™ Dehumidification System 3, 4, 5 & 6-ton (R-22) 7.5, 10 & 12.5-ton (R-22) 6.5, 7.5, 8.5, 10 & 12.5-ton (R410A) 15, 20 & 25-ton (R-22) 15, 20 & 25-ton (R-410A)

Coleman MagnaDRY™ The Coleman MagnaDRY system combines a high efficiency heating/cooling unit with a unique dehumidification system to… Provide superior dehumidification at wide range of OD temperatures. Provide comfort by performing cooling and/or dehumidification when needed. Provide comfort without overcooling the space. Available in 3 to 25 ton packaged units

Why Reheat Conditioned Air? In conditions with high humidity and moderate temperatures Thermostat satisfies, yet blower continues to run to satisfy outside air requirements Outside (moist) air is continuously supplied to the space Most modern equipment have high evaporator temperature due to increased efficiency requirements The result…an uncomfortably humid cave-like environment In many parts of the country, high humidity is as unavoidable as cold winters in North Dakota or hot summers in Phoenix. This high humidity level, or high latent heat content of the air, presents unique challenges for those charged with designing comfort systems.

A properly applied air conditioning system will: A properly applied air conditioning system will run continuously at design conditions: Removing both sensible and latent heat. Cycle on and off below design conditions Demand is based on thermostat set point Problem is…thermostat only measures sensible temperature Effects of short cycling in high humidity areas: Higher Energy Costs Lowering the thermostat to run the unit longer Uncomfortable Conditions A properly sized air conditioning system will offset both the latent and sensible heat gains of a space by running continuously at design conditions. However when operating at below design conditions, the unit will cycle on and off in response to a demand from the thermostat, which only measures sensible heat.

Solutions to High Humidity Lower the Thermostat Not a good choice, creates occupant discomfort as humidity rises Add a humidistat Same result as lowering the thermostat Add a humidistat and reheat the air Solves the problem by not lowering the temperature when de-humidifying the air Add sensible heat back into the air Electric Heaters Gas Furnace Hot Water Coil These methods cost $$$ or violate building codes! Redirect the compressor’s hot gas Lower the thermostat. While this does help mitigate the humidity problem by running the compressor longer, it also results in uncomfortable conditions due to the temperature being too low, as shown in previous slides. Use a humidistat and a thermostat. When the humidistat senses an unacceptably high level, it energizes the compressor, even if no call for cooling exists at the thermostat. This also results in improved humidity levels, but uncomfortably low temperatures. Use a humidistat and reheat the air. This option is the most desirable as it lowers the humidity level in the space, but does not lower the temperature to a level that causes occupant discomfort.

The Solution for Every Building Type Large Commercial High Technology Locker Rooms Hotel Lobby Schools Supermarkets Strip Malls Food Sales Shopping Malls Government Museums Airports These are the types of businesses and customers we serve. We have a solution for every type of building. Medical Clinics Small Commercial Arenas/ Convention Centers Health Club Hospitals Printing Shops Product Distribution Mid Market Complex

Thermostat Control A variety of thermostats and humidistat's can be used to control the unit. There are no special devices required Humidistat can be separate or integral to the thermostat

Conventional AC Circuit

Conventional reheat circuit

Coleman 2-stage Reheat Circuit (Cooling Mode) To eliminate this issue, York has developed it’s patented Hot Gas Reheat Circuit shown above. This enhanced circuit includes an accumulator, a second check valve and two additional solenoid valves. When in cooling mode the Hot Gas Reheat Solenoid Valve (SOL3) is de-energized, SOL1 is energized (open), and SOL2 is de-energized (closed). This activates the condenser coil and de-activates the reheat coil. With the reheat coil now exposed to the low pressure side of the system, most of the refrigerant and/or refrigerant oil is drawn into the suction line. It’s then routed to the accumulator where the vapor and liquid refrigerant is separated prior to making its way back to the compressor. When in reheat mode, SOL2 and SOL3 are both energized (open) and SOL1 is closed. Now the reheat coil is active, but the condenser coil is inactive. The condenser coil is exposed to the low pressure side of the system, which draws any refrigerant or oil in the coil back to the accumulator

Coleman 2-stage Reheat Circuit (Reheat Mode) To eliminate this issue, York has developed it’s patented Hot Gas Reheat Circuit shown above. This enhanced circuit includes an accumulator, a second check valve and two additional solenoid valves. When in cooling mode the Hot Gas Reheat Solenoid Valve (SOL3) is de-energized, SOL1 is energized (open), and SOL2 is de-energized (closed). This activates the condenser coil and de-activates the reheat coil. With the reheat coil now exposed to the low pressure side of the system, most of the refrigerant and/or refrigerant oil is drawn into the suction line. It’s then routed to the accumulator where the vapor and liquid refrigerant is separated prior to making its way back to the compressor. When in reheat mode, SOL2 and SOL3 are both energized (open) and SOL1 is closed. Now the reheat coil is active, but the condenser coil is inactive. The condenser coil is exposed to the low pressure side of the system, which draws any refrigerant or oil in the coil back to the accumulator

Two Modes Of Operation Mode of operation is determined by: Normal Mode Humidistat demand Thermostat demand Mode selector jumper on the reheat control board (RCB) Normal Mode With a demand for reheat (meaning the humidistat is closed) and no demand for cooling, compressor #1 operates in reheat mode. A Y1 call for cooling will cause unit to disengage reheat and return to cooling mode Alternate Mode With a demand for reheat, but no demand for cooling, compressor #1 operates in reheat mode and compressor #2 operates in cooling A Y1 call for cooling will cause no action from the unit and will continue to operate in reheat mode. A Y2 call for cooling will cause disengage reheat and return to cooling mode This slide introduces the concept of reheat modes of operation. The sequence of operation for each mode is outlined in the next two slides.

3-6T (1 stage) MagnaDRY™ cooling cycle

3-6 MagnaDRY™ cooling cycle

3-6T (1 stage) MagnaDRY™ reheat cycle

3-6 MagnaDRY™ reheat cycle

Coleman MagnaDRY™ Product benefits Reduced motor horsepower due to lack of separate reheat coil Very simplistic Reduced number of components in system Ease of coil maintenance Lower cost with equivalent performance Watch competitive data, it can be misleading when comparing performance Watch out for specifications requiring separate reheat coil Includes HGB as standard to accommodate a wider range of airflows

MagnaDRY Tools

MagnaDry Tools Tools can be downloaded from the Commercial Product Tools section of UPGNET. White Paper Selling story Excel Tool Compare cooling and dehumidification performance of two different units

MagnaDry Tools White Paper Selling Story

MagnaDry Tools Excel Tool Compares unit performance Instructions Example

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