Question about Desa International CBN30T Central Heating System Heater

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Position of ceiling diffusers for a ducted warm air heating syste

In a ducted warm air system how should we decide on the best position for the ceiling diffusers in each room?

Thanking you in Advance
Best regards,
Allan Whittaker
New Zealand

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You want the air to distribute through the room as evenly as possible. You don't want the air to blow down in one spot. In a room where a thermostat is located make sure the air doesn't blow toward the thermostat or this will make the unit turn off before the desired temp is reached.

Posted on Nov 15, 2009

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Bonaire vulcan comfort control


No it cant really be fitted as the evap system uses much larger duct and also in some cases people use a different type of duct that when running a gas heater threw it it tends to melt with the heat. Your best option would be to get new ducting that way you can size it correctly so you dont have air alance issues down the track.

May 10, 2014 | Heating & Cooling

Tip

Radiant Heating - Why do You Feel Warm? The Best Most Efficient Heating System


What makes you feel warm on a sunny day in the summer? Radiant heating or radiant energy is usually recognized as the oldest form of heating. It provides the best comfort and is the basis for all types of heating systems. Radiant heating is "radiant energy" being emitted from any heat source. Radiant heating is the effect you feel when you can feel the warmth of the sun or a hot stove top element from across the room.

Radiant heat is widely known as the most comfortable and efficient heating method you can find. Some of the advantages of radiant heating are: it is usually more efficient than baseboard heating and almost always more efficient than forced-air heating because no energy is lost through ducts and other transfers. This technology can be used for both heating indoor and outdoor areas. These heating systems work by supplying heat directly to the floor, to panels in the wall or to the ceiling of a house. Because the radiant heating will make you feel warmer when you are in a room, you can have the thermostat at a lower temperature and still feel warm.

The feeling of warmth is the absence of heat being pulled from your body. If the walls, floors, and ceilings around you are warm then they are not pulling heat from your body. Then you feel warm. Your body is not giving up heat to them.

Because of this radiant heating systems can provide massive energy savings of more than 10-30% in most residences, and sometimes up to 60% in shops, hangars and warehouses. Radiant heating provides even warmth with no cold spots within a room. That provides a comfortable environment that cannot be matched by any other type of heating system.

New radiant systems are currently designed to run cooler than they did in the past. The water supplied to the systems will generally range from 90 to 140 degrees. Remember radiant heat can travel in any direction and is unaffected by gravity. Radiant heating systems will allow you to be more comfortable at a lower thermostat setting. Radiant heat will warm the closest and coldest mass, which then radiate heat throughout the space evenly. Radiant heating will give you the most consistent room temperatures from floor to ceiling when you compare it to any other heating system.

on Dec 12, 2009 | Heating & Cooling

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The blower starts before its warm and it blows cold air for about 30 sec when its shutting down .


When any unit 1st come's on, you'll always have some cold air that's in the ducts that will blow out before you get warm air. If your duct work is uninsulated in a cold basement or crawl space then it will be even more noticeable. When the unit is heating from the Heat Pump mode, it takes a little longer for the gases to get warm enough so you'll fell heat. When it gets cold enough for the unit to switch from heat pump to the gas or electric heat source, you'll get warm air faster. If you have gas heat, some Thermostats have an anticipator setting for the gas valve. If it's set wrong it will effect the on/off cycle of the gas valve.
All duct work in non heated and a/c spaces, including inside walls,above dropped ceilings, in attics and crawl spaces, must be sealed & taped at the seams and joints and then insulated and taped.
Most new construction has solved that problem with insulated duct board, flexible insulated supply's and special tape.

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1 Answer

Fridge is warm, was collecting water inside. Freezer is working fine. Increased temp but not responding. It is a bottom freezer model


send the model number off of the fridge,if the freezer is working fine then no air is being blown up to the fridge section,all it does is blow cold air from the freezer to the fridge section so either the door was left open and this is very common with a bottom mount freezer or the evap fan isn't blowing or on some models there's a damper inside the fridge section,the damper door opens and closes to let cold air in,when it reaches temp. the door closes,sometimes the door gets stuck in the closed position or the open position and the fridge freezes or gets warm depending on where the door is.first thing open the freezer door,do you hear the fan blowing,if not you could have a bad evap. fan motor,next look at the ceiling and on the packages,do you see frozen water droplets,if so the door was left open and the air ducts are froze up from the warm air getting in from the door being open and mixing with the cold air freezes up the air ducts,also stick your hand onto the back inside wall of the freezer,if there's like snow or frost on the inside back wall of the freezer you could have a defrost problem,bad defrost thermostat,heater,timer or board depending on the model or last a bad damper,when you open the fridge door there are air ducts usually up top and in the middle you should feel cold air blowing in,this is your problem the air isn't making it into the fridge section.if the door was left open,unplug the fridge,remove the food from the freezer and with a hair dryer heat up the back inside wall of the freezer and blow the hot air into the air vent holes in the back wall to melt out the air ducts,keep heating it up until you don't see any more water dripping,you can see the water dripping through the vent holes.so let me know what you find,send the model number and we can go from there.look up near the ceiling in the fridge section on the right hand wall and you should see a tag with the model and serial numbers,send the full model number so i can see what you have in your machine.

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1 Answer

Heating system do not work. It started a couple of weeks ago. When set at 70, it produced no warm air. cold air would come from the vent/duct. when increasted to about 76, it would produce heat. Now it do...


I have the exact same problem. Started occasionally blowing cold air. Now I can't get the hot air to come through. Could it be a flapper door that open and closes depending on the tempurature setting?

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1 Answer

I have an HRV system and want to know if it is possible to run a heat pump through my HRV ducts in the ceiling?


Hi, can you tell me what kind of heat recovery ventilation system you have? Is it a Honeywell, Lennox, ect.? Also tell me about how you have it set up as far as the duct work you are talking about and what kind of heat pump system you plan to install. If you tie your central air heat-pump ducts into the HRV ducts, it will interfer with the air flow. If you will, please tell me what you plan on doing as far as installing what to your home? New duct work for a new central air heat-pump unit, or what, so I will have some idea on what you are doing. Thanks so much. Contact me through my user name below.
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Did you purchase a new Ducted Ceiling Unit with the Upper Unit air conditioner? If you are replacing an older mach 3, the ducted ceiling packs are not compatible and you will need to purchase the ceiling pack as well. The ducted ceiling pack part number for the 8333 series Mach III AC is below.

1. Heat/Cool Air Distribution Box - 8330B735
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