EMI WLHA - Manual (Page 30)

www.enviromaster.com WLCA/WLHA High Wall Evaporator 30
troUBLEsHootinG proCEdUrE Continued
power supply Check
When trouble shooting any EMI prod-
uct, it is important to first check the rating
plate for proper field voltage and breaker
size. Secondly using a voltmeter check the
incoming power supply to see that it agrees
with the rating plate. The incoming power
should not exceed the nameplate voltage.
Also, the incoming power should not be
below the minimum voltage stated on the
rating plate (197V for units rated 208/230V
and 104V for units rated 115V).
A check for low voltage power should
also be made. By placing a voltmeter
across low
Volt terminals “R” and “C” at
the indoor unit, there should be a reading
of 24V.
Figure 1B
Not used
Figure 2 C
Figure 2 A
Figure 2 B
Test Mode
is available for unit mounted
control configuration only. Use of test mode
can aid in the functional check of the unit.
It can also be a helpful tool when trouble
shooting to solve a problem.
To enter test mode, while the unit is in
off mode, press “On/Off”, “PROG” AND
“Time” buttons simultaneously for three
seconds. To exit press again or remove
power to the unit. While in test mode all
timers are shortened.