Fan And Heater Circuits; Terminal Blocks In Raceway - Hussmann IMPACT RL Technical Data Sheet

Fan and Heater Circuits - Electric Defrost (standard)
208V
1
2
3
120V P
OWER
14
B
16
13
120V POWER
Switch
17
OR
Defrost Termination
FIELD WIRED
Thermostat
DB
Low Temperature with
Electric Defrost
R R
1 2
Permanent Internal
Jumpers
DEFROST HEATERS
(208V)
Electric Defrost Sequence - Low Temperature
1. Power from the defrost contactor energizes Defrost Heaters and 208V Evaporator Fan Relay Coil (7). Relay Contacts open the
fan circuit and energizes the Drain Pan Heater.
2. If the Defrost Heater raises internal air temperature above 90°F, the Defrost Limit Thermostat (4) will open.
3. Temperature rise of the evaporator closes the Relay Control Thermostat (5) at about 35°F, energizing 120V A.S. Relay Coil (6).
This relay's contacts open the Frame and Door Heater Circuits.
4. When Defrost Termination Thermostat ends defrost period, the defrost contactor opens the Defrost Heater and Evaporator Fan
Relay Coil Circuits. The Drain Pan Heater goes off and fans are on.
5. Temperature fall of the evaporator opens the Relay Control Thermostat (5) at about 20°F, de-energizing 120V A.S. Relay Coil (6).
A.S. Relay Contacts close the Frame and Door Heater Circuits.
P/N 0425644_M
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.)
R
Rear Defrost Heater
8
R
Front Defrost Heater
8
R
Fan Relay
7
F
N.C.
COM
Fan Relay
7
F
N.O.
Y
Relay Control
B
A.S. Relay 6
A.S.
COM
N.C.
B B
N
EUTRAL
20
L OR
2
DB
C.O.R.

Terminal Blocks in Raceway

R R B B R R B P
3 4 5 6 7 8 10 11
Removable External
Jumpers
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. • WWW.HUSSMANN.COM
Evaporator Fan
7
Relay Coil
1
3
C
8
R
7
R
Defrost Limit
6
B
N.C.
1
Evaporator Fans
Rod Heater (Drain) 9
A.S. Relay
5
Coil
3
1
c
C.O.R.
10
Frame A.S. Heaters
11
P
Door A.S. Heaters
12
2P
2P B B B OR OR 2P
12 13 14 16 17 20 21
FANS & A.S.
LIGHTS LIGHTS
(120V)
(120V) (Neutral)
208V
CAUTION: When multiplexing
4
merchandisers equipped with defrost
R
heaters, if branch circuit overcurrent
protection is larger than the
individual merchandiser's defrost
circuit load, then additional
supplemental overcurrent protection
may be required per NEC Articles
4
210 and 240.
5
B
O.O.R.
N
EUTRAL
26
BR
Refer to Innovator Reach-In
Glass Door, Installation and
Service manual, P/N 0425683,
25
Y for Innovator door and frame
replacement parts.
6
24
W
22
P
Defrost Termination
21
2P
P W Y BR
22 24 25 26
FANS & A.S. (Neutral)
2
Thermostat
Refrigeration
Thermostat
3
(Optional)
Pink
}
To
Condensing
Unit
Dark Blue
5 of 6