www.enviromaster.com
The Ductless Split System of Choice
25
!
!
TROUBLESHOOTING PROCEDURE
Continued
CAUTION
While in test mode, all timers are eliminated. Avoid
short cycling the compressor. After system checks
are complete, the control must be returned to normal
operation.
DO NOT LEAVE THE SYSTEM IN TEST
MODE!
To enter test mode the unit must first be in the
off state
.
Next, using the unit mounted keypad depress both the
up
and
down
arrow buttons simultaneously and push the
On/Off
button in for one second. The unit is now in test
mode. System function checks can now be made without
having to wait for timer delays. To return to normal operation,
switch the unit off again via the
On/Off
button for at least
30 seconds. When the system is switched back on, normal
operation will resume.
LOW VOLT CONTROLS
COOLING ONLY UNITS
Cooling only units utilize
low Volt
interconnecting
wires between the indoor unit, outdoor units and
thermostat. For air handlers with unit mounted controls,
wires (WCP/WHP) or terminals (CCP/CHP/FCP/FHP)
designated “Y” (yellow) and “C” (brown) of the indoor air
handler should be connected to the corresponding “Y”
(yellow) and “C” (brown) wires or terminals of the outdoor
condenser. Other wires or terminals such as “R”(red) or
“O” (orange) may not be needed and should be protect
by a wire nut from making contact with the junction box or
other metal surfaces.
Refer to low volt interconnect diagram interconnect diagram
Figure 1
for unit mounted controls and
Figure 2
for remote
thermostat connection.
A 24V transformer located in the indoor air handler unit
(as of 12/01/04)
provides low Volt control power to both the
indoor air handler and outdoor condenser. The 24V power
supply can be measured by placing a meter across the “R”
and “C” low Volt terminals of the air handler. The air handler
will switch on and off the condenser through the yellow (Y)
wire. When the air handler is calling for cooling, 24V can be
measured between terminals (wires) Y and C.
ELECTRIC HEAT
Units with electric heat utilize a control relay located on the
circuit board in the control box. As a safety feature, an auto
resetting limit switch located on the heater end plate or on
the heater assembly will interrupt power to the heater should
an over-heat condition occur. Each electric heat assembly
Figure 2
Figure 2 A
POWER SUPPLY CHECK
When trouble shooting any EMI product, 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.
TEST MODE
Test mode is available only on units with unit mounted
controls. Use of the test mode feature can aid in the
functional check of the unit. It can also be a helpful tool
when trouble shooting to help isolate a problem source.
