Month: November 2007

Using a night thermostat on a zone system

Some customers, especially commercial customers, will want to use a night thermostat to set back all the zones in a zoning system to allow for occupied and unoccupied temperature scheduling of the building. The components needed are a night thermostat, a 7-day time clock, and an override timer. Occupied and unoccupied scheduling can be accomplished […]

Troubleshooting a Z-300 Panel

Listed below are some steps to help technicians troubleshoot a Z-300 panel from Jackson Systems.  These steps are a quick and easy way to narrow down where the problem area might be.  Here are the basic steps to start with: 1. Verify that the power light is on.  If not, check the fuse marked “PC […]

What I am thankful for?

Such a simple question, but such a long answer.  If I listed everything that I am thankful for, it would take up many pages, so I will just list some of my top ones. I am thankful for all those that have served and are currently serving in the United States military.  I am humbled […]

Changing Z-300 fan default mode

The Z-300-HC control board is a single heat/single cool zone control board that defaults to the dampers being open when there is not a call for conditioned air (heating or cooling).  We call this ventilation mode.  In some applications you may want to have zone #1 damper closed and not go into ventilation mode after […]

Anticipators on Thermostats

The reason heat anticipators are not required on solid-state, microprocessor based thermostats is that the thermostat control algorithm is designed to track the temperature rate of recovery in the space and automatically adjust the equipment on/off time (cycles per hour) to achieve the thermostat setpoint without over-heating the space. A heat anticipator on a mechanical […]

E Contact on a Thermostat

Some contractors have come across an E contact on a heat pump thermostat.  This thermostat is using the E contact for emergency heat. Many zone boards including Jackson Systems Comfort System boards do not have a corresponding E contact but run the emergency heat through the W (auxiliary) contact. What we would do in this […]