12
2 ) R e q u i r e d B a t t e r y M a i n t e n a n c e
Battery life expectancy is a function of its discharge cycles (the number of discharges and their depth) and the ambient
temperature of the battery during normal operation. In most applications, the battery should see relatively few
discharges. Therefore, ambient temperature has more to do with determining the life expectancy of the battery than does
any other factor. If the VWG is installed in a conditioned space, the battery should provide dependable service for
approximately three years (average). In an environment where the operating temperature is higher (that is, 50
º
C or
122
º
F), you should only expect the battery to last approximately one year.
The NiMH battery in the VWG controller is fully discharged when factory shipped. Additionally, NiMH batteries lose
charge over time if not kept trickle-charged (for more details, see “About the Battery,”). Therefore, even a new unit (or
replacement battery) will require up to 18 hours of powered operation before it can provide reliable backup power (is at
full charge).
3) Standard Replacement Parts
Standard replacement parts are listed in Table 4 and can be ordered from stock without restriction. Standard
replacement parts cannot be returned for credit and should be disposed of in an appropriate manner.
Table 4
Standard replacement parts.
P a r t N u m b e r D e s c r i p t i o n
VWG-BB
NiMH Battery Pack (with battery bracket)—see
“
Replacing the Battery,”
Note
Screws used for the VWG are standard #6-3 2 x 3/8" types, which you can obtain locally if lost.
Non-replaceable Parts
Other than the parts listed in the replacement parts sections, there are no serviceable components on the base
assembly.
•
Memory
The current release of the VWG limits the maximum number of wireless thermostats that can be attached to the VWG40
to 30. Modification, or replacement of memory components requires software configuration and is not a field upgrade. For
additional information if modifying the memory capacity of the VWG, contact Viconics for technical support.
•
Fuse
The VWG contains a non-user replaceable fuse, soldered on the circuit board. This fuse provides protection from internal
shorts or connection to incorrect power supplies. If the fuse circuitry is suspect, contact Viconics for technical support.
See the “Returning a Defective Unit” section.
Returning a Defective Unit
For proper credit on the returned unit, ship the defective module to Viconics within 30 days.
Prior to returning the unit, contact Viconics to obtain a return material authorization (RMA) number and other instructions.
Please provide:
• Product model
• Serial number
• Nature of the defect
Certifications
Federal Communications Commission (FCC)
This equipment generates, uses, and radiates radio frequency energy, and if not installed and used in accordance with
the instruction manual, may cause interference with radio communications. It has been tested and found to comply with
the limits for a computing device pursuant to Part 15 Subpart C of FCC Rules, which are designed to provide
reasonable protection against such interference when operated in a commercial environment.
