This troubleshooting problem involves a 5-ton, R-22 rooftop air conditioning unit, and the customer’s complaint is that on days when the ambient temperature exceeds 90°F, the system doesn’t keep the store, which was recently remodeled, comfortable even though it seems to be running continuously.
In this troubleshooting situation, the customer is complaining that their comfort cooling system isn’t performing as it should. Their description of the problem is that the house always seems to be too “sticky”. They also say that the problem seems to be especially evident when the outdoor ambient reaches its highest level in mid-afternoon.
This troubleshooting situation has a history. In the six years that the up-flow gas furnace in this three bedroom house has been in service, several attempts have been made to solve the problem of one bedroom that, according to the customer, is always too cool during the heating season. This residence is a brick home on a slab, and the air handling system, which located in the crawl space above the ceiling, is shown in Figure One.
This month’s troubleshooting situation involves an up-flow gas furnace that serves as both the heating source in the winter and as the air handler in a split system for cooling in summer. The condensing unit is on a pad next to the building on a concrete slab. Since there is no crawl space or basement, the connecting tubing and wiring for the condensing unit are routed through an underground chase from the equipment room to the outside.
The equipment in this month’s troubleshooting problem is a forced-air electric heating system with five resistance-type elements, and in order to ensure that this equipment can operate with maximum efficiency and prevent an electrical system overload on a call for heat, a multiple-step sequencer system employed.
In this month’s troubleshooting problem, the equipment that needs servicing is a split system heat pump, manufactured under the brand name Grandaire (ICP, Lewisburg, Tennessee). The indoor unit model number is WAPT304A2, and the outdoor unit model number is WCH5304KGA100. This is a 2.5-ton unit in a residential installation.
This month’s troubleshooting situation centers around a standard natural gas, induced draft, hot surface ignition system furnace. This is a new installation that has been accomplished in anticipation of the upcoming heating season, and the problem is that during the initial start-up, the unit did not perform properly.