Monthly Archives: December 2007

Boost your zone control sales with this simple presentation

We are excited to bring you a new sales tool. This tool takes a look at zone control and helps your customer view and listen to what zone control is and how it works. The presentation is created in flash so everyone can view it from your website.

This customizable presentation will allow you to drop in your company logo and phone number, and view via your website so your customers can learn more about zone control. This presentation shows your customers:
– What zone control is
– How zone control works
– How they can be comfortable in their home
– Who to contact for installation (YOU!)

View the presentation

We are constantly looking for ways to help you sell zone control. If you have a need for sales or marketing materials we can help you create, please tell us what you want!

Using an Isolation Relay to loop multiple Retro Dampers

With the slow down in new residential construction many contractors are looking for ways to keep sales growth moving forward.  One way they are doing this is to offer their expertise to homeowners who are looking to upgrade their existing whole house HVAC system to a zone control system.

We recently had a contractor call us and said they are retrofitting a house with our Z-300-HC zone control using it for 2 zones.  He wanted to use 9 retro dampers in zone 1 and 12 retro dampers in the current duct work on zone 2.  Being that he was an experienced contractor and knowing that Jackson System’s retro dampers uses 3.8VA each, he knew he couldn’t use a 70VA transformer to power our control panel, zone 1 and zone 2.  He called us for help.

We suggested using an Isolation Relay and a separate 120v/24v 75VA transformer for zone 2.

We walked the contractor through the following steps.  Using a Jackson Systems RY-1-HB relay(24v coil NC-C-NO contacts) we had him wire the two contacts marked 24v coil on our relay into the D and D contacts on the zone 2 terminal strip on his control board.  Next we took the common wire from our second separate transformer and wired it into the C contact on the relay.  We wired the 2nd common of the transformer into the common of the 1st retro damper of zone 2.  We then ran a wire from the NO contact on the relay into the NO contact on the 1rst Retro damper and the wire from the NC contact in the relay into the NC contact on the 1st retro damper. 
Now we are almost done.  We wire the remaining 11 dampers in zone 2 in parallel to the 1st retro damper. 

What we have accomplished is powering the zone 2 dampers with its own transformer and tying them all into the Z-300-HC control board using an Isolation Relay.  We have saved the contractor and homeowner money by not having an additional control board with a very small additional cost of a transformer, a relay and wire.

The next time you are retro fitting an existing HVAC unit remember there is usually a way to accomplish what you want that is quick, easy, and inexpensive to install on the job.

  Wiring_diagram_isolation_relay_wi_4

Santa Watchdog

Never miss Santa again!  Keep track of Santa this year with the Santa Watchdog™

The Santa Watchdog™ is an alarm system that monitors your roof, windows, doors and fireplace. When
Santa finally arrives on Christmas Eve, the Santa Watchdog™ sounds an extremely loud siren and can also trigger an alarm, phone dialer or any other security device.

Features:Warnsanta_2
Can be used on any home
Alarms if sleigh touches down on roof
Alarms if Santa comes down chimney
Alarms if cookies and milk are disturbed
Extremely loud 118db siren/sounder
Alarm silence timer
Silence switch
Can be tied to central alarm system or other security devices
Affordable and reliable
1 Year Warranty

In the unlikely event that Santa does not come to your home, contractor and/or manufacturer are not liable. Made in America and lead free!

The Main Components of a Zoning System

Several companies manufacture HVAC Zone Control products in the residential market. These products may have some differences in their bells and whistles but they all contain the same major components when it comes to residential zoning. Most residential zoning is zoned into 2 or 3 zones.

Control Panel– Every zone control system requires a control panel/control board to relay information from the thermostats to the HVAC system and to control the dampers.

Transformer– Every control panel should have its own separate transformer, it is best not to use the equipment transformer to power the panel and dampers. There is simply not enough VA to power the dampers.

Dampers-Every zone requires dampers to either close or open the passage way in the duct to control air flow.

Thermostats Every zone requires thermostats to measure and display the room temperature and communicates with the HVAC unit through the control panel.

High Limit- Every zone control system should have a high limit to protect the equipment from high heat.

Low Limit-Every zone control system should have a low limit (suction line freeze stat) to protect the equipment from low temperatures.

Bypass Damper-Many zone control systems require a barometric bypass damper in order to maintain proper static pressure.

Barometric Bypass damper

A question that comes up frequently when quoting zone control systems is, why and when do I need a bypass damper?  As the individual zone dampers close, the system static pressure will tend to rise.  In order to maintain constant airflow through the HVAC system, a barometric damper can be used to bypass some of the discharge air back to the system.  The bypass damper should be installed in such a way as to connect the supply air duct to the return duct.  Damper adjustment is done by moving the weight up and down the arm.  If only two zones are required, size each zone to handle about 75% of the total CFM.  This method does not require a bypass damper.  If one zone requires substantially more CFM than the other, it is recommended that the larger zone damper be set to bleed about 20% of its air.  If more than two zones are required, install a bypass damper.  It should be set to bypass just enough air to maintain a quiet, draft free system.  Barometric bypass dampers can be used on systems with static pressure ratings up to 0.75”W.C.  Bypass dampers are sized based on the cooling tonnage.

Condensing Unit

Damper Size

2.5 tons or less

8” bypass

3 tons

10” bypass

4 tons

12” bypass

5 tons

12” bypass

7.5 tons

14” bypass

10 tons

14” bypass

For systems larger than 10 tons, subtract the CFM of the smallest zone from the total system CFM, then size the bypass damper to handle 100% of this difference at 2,500FPM.

Switching a round powered open damper to a powered closed damper

You can change a Jackson Systems’ round powered open damper to a powered closed damper in the field.  You will have to reach in the damper so the damper may need to be removed from existing duct work.  What we are going to do is flip the actuator from one side of the damper to the other.

These steps are for round dampers only!

1) Unscrew the shaft collar and slide the motor off
2) Unscrew the minimum open position screw and slide it out
3) Pinch the plastic grommet that accepts the anti rotation pin.  The grommet is inside the damper, this is where you have to reach in the damper, and slide out the pin from the grommet.
4) Flip the damper over and remove the black pop out plug
5) Switch holes for the grommet and pop out plug
6) Put in the anti-rotation pin and secure with the grommet from inside the damper
7) Slip in the minimum position screw
8) Slide on the collar then the motor
9) Tighten the collar screw

Programmable thermostat versus the combination of a night thermostat, time clock, and override timer

Regarding the last 2 blog entries, you may be wondering “which way is better” or “when do I use one or the other”.

When to use a programmable thermostat or the combination of a night thermostat, time clock, and override timer, used for occupied or unoccupied scheduling depends on the customer.  A programmable thermostat requires someone within the organization to take ownership of knowing how to program the thermostat.  They must be “the go to person” for this thermostat.  They must know how to configure the thermostat to provide occupied/unoccupied scheduling and make any changes in the configuration if needed.  Sometimes there is a person like this around, other times there is no one like this around. The installation of the thermostat will be easier than installing the other 3 components and the thermostat is very flexible such as programming different holiday schedules.  A combination of a night thermostat, override timer, and time clock may not be as intimidating to people.  Many times the night stat and time clock are not even visible to the end users if they are installed in an equipment room.  Only the mechanical override timer is visible, and this piece of equipment is considered very user friendly.  The configuration should be quicker with this set of equipment and many commercial contractors have more experience with this proven equipment.

Using a programmable thermostat for occupied and unoccupied scheduling

A Honeywell TB7220U CommercialProTM programmable thermostat can be used for occupied and unoccupied scheduling of a Jackson Systems’ Z-2000 Comfort System.  When wired and configured properly this thermostat can take the place of a separate 7-day clock, night thermostat, and override timer.
The thermostat’s “G” fan output is used to open and close the Clock Contacts “T” terminals on the Z-2000 panel that places the system in the occupied and unoccupied mode of operation.  The thermostat does not control the HVAC equipment and only uses the “G” fan output to put the Z-2000 panel in either occupied or unoccupied mode.  This is accomplished by programming the thermostat so that the fan is ON during occupied mode.  When the thermostat goes to the unoccupied mode, the fan circuit automatically changes to AUTO and will only energize the “G” output when there is a call for heating or cooling.