Hussmann IMPACT RLT Technical Data Sheet page 6

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