5.9 Defrost Thermostat & Timer
The defrost thermostat is attached to the refrigerant
suction tube between the accumulator and compressor.
If the low side refrigerant temperature drops due to
excessive frost formation on the evaporator coil, the
thermostat opens. The compressor is then cycled off
and on by the defrost timer. The blower will continue to
run, causing air to flow through the evaporator coil and
melt the ice when the compressor is off. When the air
temperature and/or humidity increase, the evaporator
temperature will rise and the thermostat will close to end
the defrost cycle.
Figure 4: Electrical Schematic of HI-E Dry 100
5.10 Condensate Pump
Condensate is automatically pumped when the water
level in the pump’s reservoir rises to close the float
switch.
If the pump is unable to empty its reservoir due to a
pump failure or blocked condensate hose, a pump safety
float switch is triggered before the reservoir overflows.
The switch turns off the compressor via its relay.
To replace the condensate pump:
1. Unplug the unit & remove the front cover.
2. Disconnect the 2 hoses from the pump.
3. Cut the pump lead wires near the old pump.
4. Remove the 2 nuts from the unit side that hold the
pump to the side.
5. Attach the new pump with 2 nuts.
6. Connect the new pump wiring.
7. Connect the hoses to the new pump. Carefully
route the hoses so they do not contact the copper
refrigerant lines or the compressor shell.
RED
RELAY
DKBLU
GRY
RED
AUTO
AUTO
RELAY CONTACTS
DEFROST
CONTROL
DEFROST
CONTROL
VIO
ON
ON
BLK
BLK
BLK
WHT
VIO
YEL
SWITCH
MOTOR
BRN
WHT
COMPRESSOR
COMPRESSOR
COMPRESSOR
OVERLOAD
PART NO. REV.
4023609
C
RUN
CAPACITOR
RUN
CAPACITOR
YEL
BRN
TIMER
TIMER SWITCH
WHT
WHT
WHT
PNK
MOTOR
WHT
BLK
BLK
BLK
BLK
GRN
115VAC,
60HZ, 1PH
CONDENSATE PUMP
FLOAT
SWITCH
PUMP FLOAT
SWITCH
SAFETY
SWITCH
C
NO
1
4 6 1
C
S
R
2
3
5
NC
BLK
ORG
ORG
ORG
BLOWER
SWITCH
BLOWER
SWITCH
BLOWER
MOTOR
BLOWER MOTOR
PUMP MOTOR
TIMER MOTOR
RELAY COIL
PUMP SAFETY
SWITCH
HUMIDISTAT
HUMIDISTAT
4 6
0
1
3
5
C
S
R
Made in U.S.A.
Therma-Stor LLC, Madison, WI
800-533-7533 or Local 608-222-5301
www.thermastor.com
7
www.thermastor.com • [email protected]
Toll-Free 1-800-533-7533
www.sylvane.com 1-800-934-9194
