What is piping connection size for supply and return on the Twin-Flo?
Both the supply and return connection are 1/2" nominal tubing.

Can more than one Twin-Flo unit be installed?
You will have to calculate the pressure drop for the distance of tubing to and from the unit, including the pressure drop for all of the fittings used in the loop

What is the water temperature drop of a Twin-Flo unit?
Calculate by dividing the BTU output by 500 (the weight of l GPM for an hour) and divide that result by the system GPM.

How far from the boiler should the Twin-Flo unit be installed?
You will have to calculate the pressure drop for the distance of tubing to and from the unit, including the pressure drop for all of the fittings used in the loop.

What happens to the output or performance of the Twin-Flo unit if I pipe the supply and return backwards?
There will be no noticeable change in the BTU output of the unit due to its size.

What size Twin Flo unit do I need?
Your local plumbing supply or plumbing contractor would be happy to provide you with a heat-loss calculation for your entire house or just the one room.

Which Twin Flo unit is the one I should use?
Based on the amount of heat in BTU that is needed, you can select from the three sizes that are available. You can also choose where to install the unit, whether under a kitchen cabinet, in a bathroom wall with the flush mounting wall kit or against the wall in a mud room with a to the floor "F" kit. You can even mount it into the floor with the floor mounting "FK" kit.

Can a Twin-Flo unit be used with a steam system?
It is not recommended. This due to the fact that the heating coils are either a continuous serpentine or multi-loop copper tube type. The basic problem is that the condensate can become trapped in a low spot and the results are noisy water hammer when the steam enters the coil and meets with the condensate.

Can your convectors be used on one pipe steam systems?
Due to the size of the copper tubing used in the construction of the convector heating coil, condensate that builds up as the steam cools and turns to water will come into contact with the entering steam and cause a condition called “Water Hammer”. Not only is water hammer a disturbingly loud noise, but it can cause serious damage to the coil and create leaks. It is not recommended that these convectors be used with “One Pipe Steam Systems”

Will your convectors work on gravity fed hot water system?
Yes. Make sure that the unit selected does not exceed the recommended pressure drop for a gravity system. Based on the age of gravity systems, you have to research to find the design criteria for this type of hot water heating system.

I am replacing an old cast iron radiator and I want to use one of your convectors. Will it work?
Yes, providing a couple of things. One, if the piping going to the cast iron radiator is steel, make sure that you install bi-metallic connectors on both the supply and return side of the convector. The dissimilar metals of steel piping and copper tubing with bronze headers can cause a chemical reaction and the result will be the premature erosion of the copper tubing in the convector coil. This would apply for both hot water and two pipe steam heating systems. The second item is to make sure that your current system is not a one pipe steam system. We do not recommend the use of our convectors on one-pipe steam systems.

How do I tell if my steam system is a one or two pipe system?
Basically, if there is only one pipe entering the cast iron radiator or cast iron baseboard, then it is a one pipe system. If there is one pipe entering the device and one pipe leaving the device, then it is a two-pipe system.

Can I paint the sheet metal enclosure of the convector?
Yes. You should make sure that the surface of the convector cover is clean and free of any oil or grease. Wash it down with a good dish detergent and dry it. Then use a fine grit emery paper or steel wool to rub the surface lightly to give the new paint better adhesion. The paint that you use should be an enamel base paint. Apply and let dry.

What will be the surface temperature of the metal enclosure when my heating system is running?
You will need to know what the operating temperature of your boiler or hot water heater is. Look at the temperature gauge on the boiler when it is cycling. The temperature gauge will show what the water or steam temperature is leaving at. The highest surface temperature would occur nearest the boiler. If the temperature gauge reads 180°F, you would subtract the entering air temperature at the convector. The heating industry uses 65°F. This will result in a surface temperature of 115°F

Can I buy just the convector heating coil to replace an old one in my house? I don’t know if it is your convector or not.
You will have to take some measurements first. You will measure the depth of the coil, from front to back. Measure the length of the coil from end to end. Then measure the distance from the center of the connecting line, from one end to the center of the opposite connecting line. With this information, you can call your local plumbing and heating wholesaler and give them these dimensions. We can make special convector coil lengths based on the center to center piping dimension, but we need to know how deep the coil is to make sure that it will fit inside your convector. Also, specify if the piping connections are both on the bottom or if one is on the top and the other is on the bottom.

What gauges of steel do your convectors come in?
Our standard convectors are supplied with 18 gauge steel front panels and 20 gauge steel back panels or liners. The front panels are also available in 16 and 14 gauge steel, and the back panels or liners are available in 18, 16 and 14 gauge steel.

What are the operating temperatures of the standard and optional low temperature aquastats on the Twin-Flo units?
The standard operating temperature of the unit aquastat is contact closed at 140 degrees F, contact open at 120 degrees F. The standard operating temperature of the optional low temperature aquastat is contact closed at 120 degrees F, contact open at 105 degrees F.

What should be checked before calling for service of my Twin-Flo unit?
Check that blower wheel is turning freely. Check wiring for loose connections. Make sure the clip holding the aquastat is snug on the copper U-bend of the coil. Check that boiler and circulator are operating. If a wall thermostat is being used, check that it is set properly.

Can a Twin-Flo be installed in a ceiling application?
The K-42 unit produces a low (50) CFM and the heated air will not be projected downward far enough to be effective. The larger K-84 and K-120 produce more CFM`s and may be effective for your application.

Why would a Twin-Flo turn on and off within a few seconds?
If the unit is wired with a wall thermostat, the air temp near the t`stat is at the borderline temperature. If the unit is hard wired with no t-stat, the aquastat is sensing the water temperature is at or near the minimum operating temperature.

Can the Twin-Flo units be used for cooling?
No. There are no provisions to collect and get rid of the condensate water that would build up on the coil fins.

Are old style Twin-Flo unit replacement parts available?
There are no longer parts available for Twin-Flo units built prior to July 1986.

Can Twin-Flo units be used in a potable water system?
Yes. Twin-Flo units are made with a no-lead 95/5 silver solder. This meets most local code requirements. Check local code to verify.

Can Twin-Flo units be used in a gravity fed system?
Most gravity systems are old and there is no easy way of determining flow rate. It is difficult to predict if the units will operate at their specified outputs.

Is a circulator pump required with a Twin-Flo unit?
For best operating results, it is recommended that Twin-Flo units be used in a hot water system with a circulator pump.

What is the operating RPM of the Twin-Flo kickspace heater?
At high speed, the motors operate at approximately 3200 RPM. At low speed, the motors operate at approximately 2600 RPM.

Can Cabinet Unit Heaters be used for cooling?
No. There are no provisions to collect and get rid of the condensate water that would build up on the coil.

Can Cabinet Unit Heater coil only be purchased to replace another manufacturer's coil?
Because there is no standard coil size or design for cabinet unit heaters, it is not recommended.

Can Cabinet Unit Heaters be used with both steam and hot water?
Standard units are supplied with a steam or hot water coil. There is an optional high capacity coil that can only be used with hot water.

What is maximum operating pressure in PSI for Cabinet Unit Heaters?
The stated operating pressure is 50 PSI. Coils are tested five times this pressure, 250 PSI, per CSA requirements.

What is the material gauge for the Cabinet Unit Heaters?
The side, top and internal cabinet panels are all 18 gauge galvanneal steel, and the front panel is 16 gauge galvanneal steel. All of the external panels are finished with a hardcoat baked prime finish.

Can a Floor Vector be used on a steam system?
It is not recommended that a Floor Vector be used on a steam system. There is not enough room inside the unit to provide the required pitch.

Can the Floor Vector product be used as a primary heat source in a home?
The Floor Vector provides a specific amount of heat (BTU output) at a specific temperature of water, therefore they can and are used as the total provider of heat for any or all rooms. They are intended to provide heat to a room when there is limited space on the wall for hot water baseboard.

What causes `pinging` or `bonging` noises when the system starts up?
Most often, if there is a metallic `ping` noise, it is caused by the fins of the element coming into contact with a stationary object, like the head of a nail or screw. A `bong` noise can be caused by a large temperature difference between the air outside the Floor Vector box (towards the outside wall) and the heated air inside the box. When the sustem turns on, the hot water warms the air very quickly and the air outside the box is sometimes 120 to 140 degrees colder. This will cause the metal box to flex or expand and create a subtle `bong,` like a kettle drum.

How can noises from the Floor Vector be eliminated?
Remove the grille and inspect the fins on the element to see if they are coming into contact with any stationary object. Make sure that the copper tube is centered in the black nylon bushings that are in the end plates of the box. If the Floor Vector box is located close to an outer exposed wall, insulation can be installed in the floor joist between the box and the outside wall.

Can Twin-Pak be used with both steam and hot water?
Yes.

What color is the Twin-Pak enclosure?
The baked prime finish is a dark tan color and is suitable for finished installation in its appearance.

What is the Twin-Pak enclosure material gauge?
Twin-Pak is a rugged 18 gauge cold rolled steel, two-peice enclosure.

How does Twin-Pak come packaged?
Twin-Pak is packaged with all of the required components; enclosure, mounting strip, brackets, hangers, and element cradles. The element is packed separately.

What element sizes are available for Twin-Pak?
The elements that are available for Twin-Pak come in copper tube with aluminum fins or steel tube with steel fins. The copper tube sizes are 3/4", 1", and 1-1/4" nominal O.D. The steel tube comes in either 1-1/4" or 2" nominal O.D.

What is a BRU heater?
A BRU is a gas-fired unit heater designed specifically for use in residential garages. It is certified for use in residential, commercial and industrial applications.

What types of fuel can be used with the gas-fired unit heaters?
Unit heaters can operate on either natural or propane gas. Gas type must be specified when ordering.

How is the BRU unit vented to the outside of the garage?
The unit is supplied with a factory-installed venting system that allows for either vertical or horizontal venting.

How do I select the right size BRU for my garage?
Because every home is different, it is recommended that you have a qualified contractor perform a heat-loss calculation for your garage. Many variables such as the number of doors and windows, exposure, and building construction type will affect this calculation. As an estimate, the BRU 30 may be enough for a one or one and half car garage, the BRU 60 for a 2 to 2-1/2 car garage, and the BRU 60 for a 3 to 3-1/2 car garage. The BRU 75 and 90 are appropriate for very large garages and light industrial and commercial applications.

What size gas connection does the BRU have?
The BRU has a 1/2" gas connection.

What size vent pipe is used for the BRU?
The BRU uses a 4" vent pipe.