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Bulletin 30-034.009 

Page 5  

 

Copyright © 2022 Unico Inc. 

All furnaces are suitable for zero clearance between the 
duct and combustible material. For servicing the control 
box, allow enough room (“L”) to swing the cover open 
and to service the blower module (Figure 5). 

The hinge 

is located on the electric furnace control box closest to 
the discharge end of the electric furnace. 

"L"

Service clearance for horizontal installations

(Top view)

IL00493.cvx

Electric Furnace

Main Plenum

Blower module

Airflow

 

 

Models 

"L" 

WON0202, WON0502 

13.0 

WON0752, WON1002 

16.0 

WON1502, WON0504, 
WON0754, WON1004, 

WON1504 

21.0 

WON2002 

24.0 

Figure  5.  Service  clearance  for  horizontal 
installations 

 

For  round  metal  plenum  systems,  use  the  correct 
diameter metal pipe adapter for your plenum size. For 
example,  the  1218  and  2430  systems  typically  use  7-
inch  (178mm),  the  3642  system  uses  9-inch  (228.6- 
mm),  and  the  4860  systems  use  10-inch  (254mm) 
diameter  pipe.  Figure  6  shows  the  installation  of  the 
Plenum  adapter  (10-inch  round  plenum  adapter  is 
already attached).  

IL00381a.cvx

Electric
Furnace

Plenum
Adapter

 

Figure 6. Start Collar Installation 

 

Always  allow  a  minimum  of  24  inches  (610  mm)  of 
straight duct between the discharge side of the electric 
furnace and any tee or elbow as shown in figure 7. 

IL00068a.CVX

Dimensions inches [mm]

24"

[610mm]

minimum

Electric
Furnace

Elbow or
Tee

Air Handler

 

Figure 7. Minimum distance from duct to furnace 

The furnace also includes a 9½ × 9½-inch (241 × 241-
mm) square plenum adapter. If the plenum is smaller, 
then  use  a  reducer  fitting.  Fiberglass  reducers  are 
available to reduce the 9½-inch (241mm) square duct to 
8½-inch (216-mm) or 6½-inch (165mm) square duct as 
shown  in  table  7.  Alternately,  the  reducer  can  be 
eliminated if you use the metal plenum adapter shown 
in table 6.  
 
The  plenum  adapters  are  designed  to  fit  inside  the 
square duct and are secured with sheet metal screws and 
washers. The joint must be sealed per UL-181A-M or 
UL-181A-P  as  seen  in  figure  8  to  ensure  an  airtight 
system. 

Note:  All  metal  connections  must  be  mechanically 
fastened  with  sheet  metal  screws  and  the  joints  and 
seams must be taped with UL-181A-P foil faced tape or 
sealed with UL-181A-M duct mastic. 

 

IL00377a.cvx

Electric
Furnace

Plenum
Adaptor

Square

Fiberglass

Reducer

1 1/2" (38mm) flat head sheet

metal screws and 1" (25mm)

O.D. washers

Fiberglass

Reducer

Plenum

Adapter

UL 181A-M

Mastic Closure

 

Figure 8. Square Duct Installation (Furnace shown 
with optional square plenum adapter) 

Summary of Contents for WON0202-C

Page 1: ...ELECTRIC FURNACE INSTALLATION MANUAL BULLETIN 30 034...

Page 2: ...UNTING 4 SPECIAL WIRING FOR HEAT PUMPS 8 SEQUENCE OF OPERATION 8 CAPACITY AT LOWER VOLTAGES 8 OPTIONAL ADAPTERS AND SPARE PARTS 9 DUCT DESIGN 10 Certified to UL Standard 1995 Conforms to CAN CSA Stand...

Page 3: ...36 3642 and 4860 800 0 38 LOCATION Before installing the furnace inspect the unit thoroughly for shipping damage Check all porcelain insulators for any breaks and inspect the furnace element wire to s...

Page 4: ...or plate adjust the plate to the proper airflow refer to Bulletin 30 020 then use 10 x 3 8 type AB sheet metal screws located inside the bulletin packet shipped with the blower module to secure the re...

Page 5: ...of 24 inches 610 mm of straight duct between the discharge side of the electric furnace and any tee or elbow as shown in figure 7 IL00068a CVX Dimensions inches mm 24 610mm minimum Electric Furnace E...

Page 6: ...e short circuit protection of internal wiring and DO NOT provide over current protection of the supply wiring Separate power supply The electric furnace is equipped with several circuit breakers inclu...

Page 7: ...3 HEAT 2COOL THERMOSTAT FAN INTERLOCK DEFROST HEAT STEP 1 5 kW AND UP STEP 2 7 5 kW AND UP STEP 3 15 kW AND UP COMMON POWER COMMON COMMON REV VALVE HEAT COOL COOL POWER FAN UNICO SYSTEM AIR HANDLER OU...

Page 8: ...no delay off feature As soon as the thermostat is satisfied the furnace de energizes For the single speed air handlers with PSC motors the blower will also immediately stop For the variable speed EC...

Page 9: ...le 5 Plenum Adapters Optional A Size Part Number 7 inch 178 mm Round A01007 G01 9 inch 228 mm Round A01007 G02 10 inch 254 mm Round A01007 G03 6 5 inch 165 mm Square A01008 G01 8 5 inch 216 mm Square...

Page 10: ...50 165 0 21 52 3 0 32 79 7 0 24 59 8 M2430B M3036B 400 189 0 14 34 9 0 18 44 8 0 19 47 3 450 212 0 17 42 3 0 21 52 3 0 23 57 3 500 236 0 20 49 8 0 25 62 3 0 27 67 2 550 260 0 23 57 3 0 29 72 2 0 31 77...

Page 11: ...02 WON1502 WON0504 WON0754 WON1004 WON1504 A01011 002 Auto Limit L165 2 pole All Revisions WON0752 WON1002 WON1502 WON2002 WON0504 WON0754 WON1004 WON1504 A01012 001 Sequencer 1 pole Original No Revis...

Page 12: ...5 sec 1 4 CRR8 5 C All WON models A B WON0752 A B WON1002 A B WON1502 A B WON2002 A B WON1504 A B A02141 003 Rectifier 9 sec CRR8 9 C WON0752 C WON1002 C WON1502 C WON2002 C WON1502 C WON2002 C A01051...

Page 13: ...02401 G07 Section Element Single 3 75kW A WON0752 A WON0752EA A02401 G08 Section Element Single 4 8kW A WON0502 A WON0502EA WON1002 A WON1002EA WON1502 A WON1502EA WON2002 A WON2002EA A02401 G11 Secti...

Page 14: ...er 15 A A WON0202 C 15 A Circuit Breaker WON0502 C 25 A Circuit Breaker POWER SUPPLY 240V RECTIFIER 5 SEC DELAY ON INTERLOCK TIME DELAY CONTACTOR CAUTION Relays and contactors utilize 22VDC coils with...

Page 15: ...SE LINK To Blower 15 A A WON0752 C 40 A Circuit Breaker WON1002 C 50 A Circuit Breaker POWER SUPPLY 240V RECTIFIER 5 SEC DELAY ON INTERLOCK TIME DELAY CONTACTOR CAUTION Relays and contactors utilize 2...

Page 16: ...LAY ON INTERLOCK TIME DELAY CAUTION Relays and contactors utilize 22VDC coils with AC to DC rectifier Do not use relay with out rectifier Replace with factory authorized parts only NC NO AIR PRESSURE...

Page 17: ...Relays and contactors utilize 22VDC coils with AC to DC rectifier Do not use relay with out rectifier Replace with factory authorized parts only NC NO AIR PRESSURE SWITCH Jumper bars remove if motor...

Page 18: ...Bulletin 30 034 009 Copyright 2022 Unico Inc Page 18 Figure 21 Internal Wiring Diagram for WON0504 C WON0754 C and WON1004 C 3 Phase...

Page 19: ...PHASE RECTIFIER 5 SEC DELAY ON INTERLOCK TIME DELAY CAUTION Relays and contactors utilize 22VDC coils with AC to DC rectifier Do not use relay with out rectifier Replace with factory authorized parts...

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