RLT with Innovator Doors
Technical Data Sheet
6 of 6
HUSSMANN CORPORATION, Bridgeton, MO 63044-2483 U.S.A.
Gas Defrost Sequence - Low Temperature
1.
Defrost vapor enters evaporator causing a rise in temperature. At about 35°F the Control Relay Thermostat
(5)
closes
the Fan Relay Coil and Control Relay Coil
(6)
circuit. The Coil opens the Fan, Door Heater, and Frame Heater circuits,
while energizing the Drain Pan, Bottom, and Plenum Heaters
(9), (10) and (11)
.
2.
If the Drain Pan Heater
(9)
raises internal air temperature above 90°F, the Heater Limit Thermostat
(4)
will open.
3.
When the defrost timer ends a defrost period, the evaporator temperature will start to fall. At about 20°F, the Control
Relay Thermostat will open, de-energizing the Control Relay Coil and Fan Relay Coil
(7).
Control and Fan Relay’s will
open the Drain Pan Heater circuits, and will close the Fan, Door Heater, and Frame Heater circuits.
9
Permanent Internal
Jumpers
A.S. Relay
Coil
BR
Evaporator Fans
1
Fan Relay
COM
N.O.
Rod Heater (Drain)
Y
Y
N.C.
6
6
1
3
W
B
Relay Control
c
25
Fan Relay
F
B
5
6
B
B
COM
N.C.
6
A.S. Relay
24
Door A.S. Heaters
Frame A.S. Heaters
22
2P
2P
P
12
10
120V P
OWER
13
26
C.O.R.
P
OR
L
120V POWER
OR
Switch
N
EUTRAL
17
20
Terminal Blocks in Raceway
Low Temperature with
Gas Defrost
20
21
22
26
17
10
11
14
13
16
LIGHTS
(120V)
Refrigeration
Thermostat
(Optional)
Pink
3
}
To
Condensing
Unit
CIRCLED NUMBERS = PARTS LIST ITEM NUMBERS
THESE ARE MARKER COLORS (WIRE MAY VARY.)
R = Red P = Purple 2P = Purple (2 Bands) DB = Dark Blue B = Black
BR =Brown Y =Yellow OR = Orange W = White
24
25
12
FANS & A.S.
(120V)
LIGHTS
(Neutral)
FANS & A.S. (Neutral)
P
W
BR
OR
B
P
2P
B
B
OR
B
2P
Y
Removable External
Jumpers
Fan and Heater Circuits - Gas Defrost (optional)
Low Temperature
16
6
Fan Relay
Coil
11
c
Defrost Limit
4
O.O.R.
14
21
N
EUTRAL
Refer to
Innovator Reach-In
Glass Door, Installation and
Service
manual, P/N 0425683,
for
Innovator
door and frame
replacement parts.
10
11
Drain Pan Heaters – Bottom
Koolgas Supplemental
Heater – Plenum
