23
CHECKING ESP-V BLOWER MOTOR
1.
With volt meter, check voltage at terminals L1 and L2
on line voltage terminal block. Voltage should be
±10
%
of ESP-V unit nameplate rating.
2.
Disconnect power to the ESP-V unit at the disconnect
switch.
3.
Disconnect motor lead at terminal L1.
4.
With an ohmmeter, check continuity between the
disconnected motor lead and terminal 4 on the fan
relay.
a.
If continuity, proceed to Step 5 below.
b.
If no continuity, feel the motor to see if it is
excessively warm which would indicate the inter-
nal over- load may be open. When motor has
cooled, check again to make sure you did not get
a false reading. If no continuity, motor is defective.
5.
With an ohmmeter, check each motor lead to ground
to be sure motor is not grounded.
a.
If not grounded, proceed to Step 6 below.
b.
If grounded, motor is defective.
6.
Check capacitor, if capacitor is suspect, replace it with
a capacitor of similar rating of motor operates normally,
make a permanent capacitor replacement.
7.
Reconnect all electrical leads, restore electrical ser-
vices to the ESP-V unit, and place thermostat fan
switch in the
ON
position.
8.
With an ampmeter, check that amp draw compares
with ESP-V unit rating plate. Amp draw shown on
plate is the FLA of motor (not the actual running
amps) and will vary with the pressure and voltage.
CHECKING ESP-V BLOWER RELAY
The ESP-V unit is equipped with a time-delay blower
relay. Wait one full minute after turning on power for relay
to close.
1.
With a volt meter, check 24v across terminals R and
C on the low voltage terminal block.
a.
If read 24v, proceed to Step 2.
b.
If no voltage, check low voltage transformer.
2.
With a volt meter, check 24v across terminals G and
C on the low voltage terminal block.
a.
If read 24v, proceed to Step 3.
b.
If no voltage, check thermostat fan circuit.
3.
Check for 230v* across terminal 4 on blower relay
and terminal L1.
a.
If reading is 230v, blower relay is O.K.
b.
If no reading, replace the relay.
* 208v on 208 line volt systems.
CHECK ESP-V LOW VOLTAGE TRANSFORMER
1.
With volt meter, check for 230v across terminals L1
& L2 on the line voltage terminal block.
a.
If reading 230v, proceed to Step 2.
b.
if no voltage, check the power supply to the unit.
2.
With volt meter, check for 24v across terminal R and
terminal C on the low voltage terminal block.
a.
If read 24v, transformer is O.K.
b.
If no voltage, replace transformer.
CHECK EXTERNAL STATIC PRESSURE
You can use a U-tube manometer to check the external
static pressure on the duct system.
1.
Puncture a 1/4" hole in the plenum duct at least 18"
from the fan coil unit.
2.
Insert one manometer tube into the hole until the
end of the tube is flush with the inside wall of the
plenum duct.
3.
System static pressure should be between 1.2" and
1.5" W.C.
a.
If greater than 1.5" W.C. add additional supply
runs.
b.
If less than 1.2" W.C. , check:
I.
Return air filter is clean
II. Return air duct has not been collapsed
III. Supply air plenum for leaks
IV. If more supply runs than recommended are
used, check that flow restrictors (orifices)
are in place.
Summary of Contents for ESPV2-109
Page 11: ...11 FIGURE 2 9 MODEL ESP V WIRING SCHEMATIC...
Page 26: ...26 NOTES...
Page 27: ...27 NOTES...
