E-mail: [email protected]
Made in Rome, New York, USA
26
TROUBLESHOOTING PROCEDURE
Continued
is also equipped with a one time fuse link. Should electric
heat temperatures rise above the auto resetting limit switch,
a non-resetting, one time fuse link will open and the heater
will remain off.
The following current values apply when the unit is connected
to a 230V power supply. These values include fan motor
current. If the supply power is different, this will in turn affect
the amp draw of the heater.
5kw = 22.3 amps, 4kw = 18 amps, 3kw = 13.5 amps.
Optional Heat pump with Electric Heat
Heat pump units with electric heat utilize four to six
interconnecting,
low Volt
wires depending control setup
and/or thermostat selected. Refer to the low Volt interconnect
section and figures 1, 2 and 3 for your particular unit.
As
of 12/01/04, a 24V transformer located in the indoor
air handler
provides low Volt control power to both the air
handler and condenser. With high Volt power supplied to the
condenser, 24V can be measured across the red (R) and
brown (C) wires at all times.
Cooling:
The air handler will cycle the condenser on and off through
the yellow (Y) wire. To check for a condenser signal, select
cooling mode on the indoor unit or thermostat and place
the set-point temperature below room temperature. Then,
with a voltmeter check for 24 Volts across the yellow (Y)
and brown (C) wires. If no signal is found then re-check
all wiring connections to ensure that they match the low
volt interconnect diagram. Check the output of the 24V
transformer (located in the air handler as of 12/01/04) to
ensure that the control voltage is present.
EMI heat pump systems utilize a reversing valve is that is
energized in the cooling mode. The reversing-valve signal
is provided through the orange (O) low Volt wire of the air
handler or thermostat. It should remain energized constantly
as long as the indoor unit or thermostat remains in cooling
mode. To check for 24V reversing valve voltage, at the
outdoor unit, place a voltmeter across the brown (C) and
orange (O) wires while in the cooling mode.
Heating:
Heat pump units can accommodate two-stage heating when
an optional electric strip heater is present along with a heat
pump condenser. The first stage being the compressor and
the second is electric heat. The air handler or wall thermostat
will cycle the condenser through the yellow (Y) wire as it does
in cooling however the reversing valve will not be energized.
To check for a condenser signal, place the indoor unit or wall
thermostat in heating. Next place the set-point temperature
one degree above room temperature to call the first stage
of heating. Then, with a voltmeter check for 24 Volts across
the yellow (Y) and brown (C) wires at the condenser. The
electric heat should be off at this point. Select a set-point
temperature that is more than two degrees above the
room temperature to call for the second stage of heating.
The electric heat should energize along with the 24V
compressor signal between “Y” and “C”. Check to see that
the amp draw corresponds with the electric heat rating.
The following current values apply when the unit is
connected to a 230V power supply. These values include
indoor fan motor current. If the supply power is different,
this will affect the amp draw of the heater.
5kw = 22.3 amps, 4kw = 18 amps, 3kw = 13.5 amps.
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
is also equipped with a one time fuse link. Should electric
heat temperatures rise above the auto resetting limit switch,
a non-resetting, one time fuse link will open and the heater
will remain off.
Units With Condensation Pumps
EMI Air Handlers are available with an optional condensate
pump. Condensate pumps are recommended when it is not
possible to gravity drain the condensation from the indoor
unit. Depending on the pump manufacture the maximum
lift for the pump will vary. Consult the pump instructions for
the maximum lift for the particular pump being used.
Condensation generated by the evaporator will collect in the
pumps’ reservoir. When the water level is high enough, a
float switch will close and energize the pump motor clearing
the water from the reservoir. Should for any reason the
water exceed the maximum preset level, a safety switch will
open, there by interrupting the (Y) signal to the condenser.
This will prevent the evaporator from generating more
condensation and spilling out of the unit.
Error Codes
Should for some reason one of the two temperature
sensors become disconnected or fail, an error code
will appear in the display. The control will not operate
properly until the sensor is working.
E1
– Coil Sensor malfunction or disconnected. Check
location
J1
on thermostat board.
E2
– Room Air Sensor malfunction or disconnected. Check
location
J2
on thermostat board.
