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the process. It may take several hours to pull down a hot, moist building or structure on initial start up, or
anytime the system has been turned off for a long period of time. It is generally best to set the thermo-
stat at a comfortable temperature and let it control the system as needed, rather than turning it on and
off.
Moisture (humidity) removal with a conventional air conditioner (cooling) unit, or heat pump when operating
in the cooling mode, is not directly controlled and is a by-product of the unit operating to control tempera-
ture in response to the temperature (thermostat) control device. Over-sized equipment can easily control
temperature but will have short run-times, thus reducing its ability to remove moisture from the circulating
air stream. There are also many additional influences that can affect humidity levels within the conditioned
space such as laundry appliances, cooking, showers, exhaust fans, and any other items that can generate
moisture or affect its removal from the space. Therefore, while operation of the air conditioning or heat
pump system in the cooling mode will remove some amount of moisture as it reduces the air temperature,
precise humidity regulation in the conditioned space cannot be assured and additional equipment such as
a dedicated dehumidifier may be required.
THERMOSTATS
There are many types of thermostats available to properly control your system, and these can vary in
features and some functions.
Approved compatible thermostats are available from Bard Manufacturing Company for all applications,
and since these can vary in numerous features and functions, it is not possible to adequately discuss
them all in this User's Guide. Many installers also install thermostats other than those offered by Bard,
and must determine proper compatibility prior to installation.
In all circumstances have your installer, Service Company or building administrator or maintenance
department personnel instruct you as to proper operation of your specific thermostat or temperature
control system.
INSUFFICIENT COOLING OR HEATING
In extremely hot or cold weather your system will continue to deliver its normal supply of conditioned air.
If the unit operates but fails to provide sufficient comfort, check the following before calling your Service
Company:
1. Be sure the thermostat setting is correct.
2. Check the air filters, and replace or clean if dirty.
3. Make sure that air can circulate freely throughout the conditioned space, and that all supply
registers and return air grilles are not blocked.
4. Make sure that the outdoor coil is not blocked with any foreign matter, or otherwise restricted with
any growth or other items.
AUTOMATIC CONTROL SYSTEMS
Manual
2100-439
3
Page
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