1. Coleman Commercial Product
Tony Landers
Commercial Marketing Manager – Unitary Products

2. MagnaDRY
Product Availability
Features & Benefits
Technical Details

3. 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)

4. 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

5. 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.

6. 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.

7. 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.

8. 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

9. 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

10. Conventional AC Circuit

11. Conventional reheat circuit

12. 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

13. 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

14. 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.

15. 3-6T (1 stage) MagnaDRY™ cooling cycle

16. 3-6 MagnaDRY™ cooling cycle

17. 3-6T (1 stage) MagnaDRY™ reheat cycle

18. 3-6 MagnaDRY™ reheat cycle

19. 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

20. MagnaDRY Tools

21. 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

22. MagnaDry Tools
White Paper
Selling Story

23. MagnaDry Tools Excel Tool Compares unit performance Instructions
Example

24. Questions ?

25. Thank
You