Maintenance; Cleaning; Required Battery Maintenance; Replacing The Battery - McQuay MicroTech II Installation Manual

Maintenance

This section provides information on the following topics:
•

Cleaning

•

Required Battery Maintenance

•
Replacement Parts
Cleaning
If dust or metal filings are present inside the unit, clean with a vacuum or compressed air. Otherwise, no cleaning inside the
unit is required. Optionally, if the outside of the metal enclosure becomes dirty, wipe it with a damp cloth and mild
detergent.
Required Battery Maintenance
Battery life expectancy is a function of both its discharge cycles (the number of discharges and their depth) as well as the
ambient temperature of the battery during normal operation. Since the battery undergoes relatively few discharges in most
types of applications, ambient temperature is an important factor in determining the life expectancy of the battery. If the
CSM is installed in a conditioned space, the battery should provide dependable service for approximately three years
(average). The CSM is designed for operation in a conditioned environment (0° to 50ºC/32° to 122ºF).
The sealed lead acid battery in the CSM controller is nearly fully charged before shipping. The battery is automatically
float-charged during normal operation (while power is applied to the unit). The CSM monitors the battery and periodically
loads the battery to test its ability to maintain battery-backed functions. Check the voltage level and its connections to the
unit. Replace the battery as required.
To order a new battery, see the Parts List on page 56.

Replacing the Battery

When replacing the battery or harness, maintain proper polarity as marked on the label inside
the unit. The battery is not protected against shorted battery terminals. Use extreme care to not
short circuit the battery. A shorted battery may overheat rapidly and cause personal injury or
damage the power wiring harness or cause other physical harm to the hardware.
To replace the battery, proceed as follows:
Step 1. Unplug the 6-position power connector. Do not remove the male connector from the wiring harness.
Step 2. Using a 1/4-inch nut driver, unscrew the lock nut from the bracket that is holding the battery.
Step 3. Hold the battery in place while removing the bracket that secures it to the bottom of the unit.
Step 4. Disconnect the two quick-connect terminals on the battery.
Note: The CSM loses time and date settings if disconnected from both battery and AC power for more than one hour.
Step 5. Remove the old battery and recycle. For recycling within the US, see the labeling on the battery.
Step 6. Connect the quick-connect terminals to the new battery. Verify that the RED (+) wire is connected to the positive
terminal of the battery and the BLACK (-) wire is connected to the negative terminal.
Page 54
WARNING
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IM 781-2