Steffes 212EXT User manual

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MODEL: EXT
FUNCTION: Core Charging
PROBLEM: Unit Charges Improperly
Place heat storage switch in the "On" position. Place charge level switch in the "Low/Auto" position. Turn thermostat
all the way down (counter clockwise) to the low stop position. Energize heater, ensure that proper line voltage is present
at L1 to L2 and F1 to F3. Remove the wiring from the charging disks and put jumpers in their place (white to gray,
orange to gray, and yellow to gray). Jumper the blue and blue/white peak control wires.
IS THE AMBER
CHARGING
LIGHT ON?
Check voltage
at T1 to T2.
Remove the jumper
between the white
and gray wire.
Does the charging
light turn off?
Check voltage at
T2 to L2.
Check voltage at
L2 to T1.
Check unit wiring.
Place the charge level switch in the "Med" position. Does the
charging light turn on?
Remove the jumper between the yellow and gray wire. Does the
charging light turn off?
Place the charge level switch in the "High" position. Does the
charging light turn on?
Remove the jumpter between the orange and gray wire. Does the
charging light turn off?
Turn up the room thermostat. Does the charging light stay off?
Change charging
disks(61,62,63).
Check voltage at
L2 to T1.
Is heater hot?
No Line
Voltage
Yes
Yes
Yes
Yes
Line Voltage
Fix unit
wiring.
Replace circuit
board (29).
Incorrect
Replace linear
high limit (33).
Yes
No
Y es
Correct
No Line
Voltage
No Line Voltage
No
No
No
No
Check the ohm value
of the elements(54).
Yes
Line
Voltage
Line
Voltage
No
No Line Voltage
No
Line Voltage
Yes
No
Change elements (54).
NOTE: If elements are open, change the charging disks (61,62,63) as well.
Incorrect
Correct
Page 2

MODEL: EXT ( 2-Mode Circuit Board without Outdoor Sensor)
FUNCTION: Core Charging
PROBLEM: Unit Charges Unevenly
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
NOTE: For cross reference to number coded components, refer to the Exploded View Diagram.
UNIT CHARGES UNEVENLY
Check unit amperage.
Check fans (53) and dampers for
smooth operation.
Check heating elements
(54), charge control
sequencer (49), and
core charging high
limits (33) for proper
operation.
Correct Incorrect
Repair fan/damper
system.
Contact technical
support at the factory
1-888-STEFFES.
OK
Defective
Check input circuit(s). Repair or replace
defective parts.
Correct Incorrect
Page 3

SET ROOM THERMOSTAT TO
HIGH STOP POSITION
Check voltage across fan high limit switch
terminals (56).
MODEL: EXT
FUNCTION: Air Delivery
PROBLEM: Fan(s) do not operate.
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
Make sure there is appropriate line voltage between F1/F3 terminal block positions in the heater.
The room temperature cannot exceed 85 degrees when performing the following test procedures.
NOTE: For cross reference to number coded components, refer to the Exploded View Diagram.
Check room thermostat (23) for
possible miscalibration. Check voltage across F2 & F3
terminal block positions (24).
Fan(s) Do Not
OperateFan(s) Operate
Voltage
Present
Remove the purple wires from
the room temperature control
thermostat (23) and jumper
them together.
No Voltage Present
Replace
thermostat (23).
Fans Run
Check unit wiring.
Fans Do
Not Run
Fix Unit Wiring.
Replace Circuit
Board (29).
Incorrect
Correct
Replace fan limit
switch (56).
Remove fan assembly
(47) and check voltage
to fan motor(s) (53).
Voltage Present
No Voltage
Present
Check units
internal wiring.
Check fan impeller for
debris that could cause
jamming. Replace if
necessary.
No Voltage
Present
Voltage
Present
Page 4

FANS RUN
INTERMITTENTLY
Check for damper jamming
and bimetallic coil assembly
(39) calibration.
Recalibrate bimetallic
coil assembly (39),
or repair or replace
fan assembly (47).
Install damper
clearancing bracket,
Steffes ETS item
#5940209
Replace the fan high
limit switch (56).
MODEL: EXT
FUNCTION: Air Delivery
PROBLEM: Fans Run Intermittently
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
NOTE: For cross reference to number coded components, refer to the Exploded View Diagram.
DISCHARGE AIR
TOO WARM
Check for damper
jamming or
obstruction.
Check bimetallic coil
assembly (39) for proper
calibration (see note).
Repair or replace
fan assembly (47).
MODEL: EXT
FUNCTION: Air Delivery
PROBLEM: Discharge Air too Warm
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
NOTE: For cross reference to number coded components, refer to the Exploded View Diagram.
Problem
PresentOK
OK
Problem
Present
Problem
Persists
Page 5

DISCHARGE AIR
TOO COOL
Check for adequate core
temperature.
Check for damper
jamming or
obstruction.
Refer to "Unit Charges
Improperly" flow chart
on Page 2 of this manual
to troubleshoot.
Check bimetallic coil
assembly (39) for
proper calibration (see
note below).
Repair or replace
fan assembly (47).
Problem
Present
Check unit for proper amperage
draw and refer to "Unit Charges
Improperly" flow chart on Page
2 of this manual to troubleshoot.
OK
MODEL: EXT
FUNCTION: Air Delivery
PROBLEM: Discharge Air too Cool
Before starting any procedures listed below, check room thermostat and circuit breaker settings.
NOTE: For cross reference to number coded components, refer to the Exploded View Diagram.
NOTE: To test the bimetallic coil assembly, it must be
completely cold. Either allow room unit to cool completely or
remove fan assembly and cool to room temperature. Once the
coil is cold, disconnect the damper linkage and let the bimetallic
coil go to its relaxed position. The bimetallic coil on units
equipped with air deflectors should be calibrated at a 90 degree
angle from the front of the fan assembly. The bimetallic coil of
units not equipped with an air deflector are calibrated at a 65
degree angle from the front of the fan assembly. Use the
cutout gauge on the left for checking this calibration. (To
determine whether the unit is equipped with an air deflector,
these deflectors would be located in fan assembly behind
bitmetallic coil.
OK
Page 6
Problem with
Core Charging
OK
Recalibrate
bimetallic coil.
Out
of Calibration

Jumper Blue and
Blue/White peak control
wires inside the heater’s
electrical compartment.
Does the off-peak light
illuminate?
Check unit wiring.
Check wiring to peak
control device.
Replace the circuit
board (29). Fix unit
wiring.
Incorrect
Yes
Fix or replace peak control
device (time clock, etc.).
Fix field
wiring.
Incorrect
Correct
No
Correct
MODEL: EXT
FUNCTION: Peak Control
PROBLEM: Green Off-Peak light does not come on at the appropriate times
Before starting any procedures listed below, there must be appropriate line
voltage present between F1/F3 and L1/L2 terminal block positions in the heater.
Page 7

Page 8
EXPLODED VIEW DIAGRAM

Page 9
EXT PARTS LIST
DWG.
REF.
NO. DESCRIPTION 212EXT
ITEM NO.
312EXT
ITEM NO.
412EXT
ITEM NO.
512EXT
ITEM NO.
612EXT
ITEM NO.
1. Wall Support Bracket 5942000 5942001 5942002 5942003 5942004
2. Painted Panel, Top 5942010 5942011 5942012 5942013 5942014
3. 1" Blanket Insulation, Top 1050010 1050011 1050012 1050013 1050014
4. Painted Panel, Front 5941147 5941148 5941149 5941150 5941151
5. 1/2" Insulation Blanket, Front & Top 1050020 1050021 1050022 1050023 1050024
6. Insulation Panel, Front 1053000 1053002 1053004 1053006 1053008
7. Mid Side Panel 5942045 5942045 5942045 5942045 5942045
8. Aluminized Steel, Front 5940002 5940004 5940006 5940008 5940010
9. Aluminized Steel, Back & Top 5940012 5940014 5940016 5940018 5940020
10. Aluminized Steel Side 5942050 5942050 5942050 5942050 5942050
11. Insulation Panel, Back 1053000 1053002 1053004 1053006 1053008
12. Painted Panel, Back 5942020 5942021 5942022 5942023 5942024
13. Heat Storage Brick 5903007 5903007 5903007 5903007 5903007
14. Brick Support Insulation, Back 1052000 1052001 1052002 1052003 1052004
15. Brick Support Insulation, Center 1052011 1052012 1052013 1052014 1052015
16. Brick Support Insulation, Front 1052016 1052017 1052018 1052019 1052020
17. Leveling Leg 1159003 1159003 1159003 1159003 1159003
18. Element Tray Cover, Right (Std Output) 5942092 5941096 5941094 5941094 5941096
" Element Tray Cover, Left N/A N/A 5941094 5941098 5941096
19. Element Tray (Std Output) 5941116 5941118 5941120 5941122 5941124
20. Painted Panel, Bottom 5942030 5942031 5942032 5942033 5942034
21. Brick Support Assembly (Std Output) 5941106 5941108 5941110 5941112 5941114
22. Grill Support Bracket 5942070 5942071 5942072 5942073 5942074
23. Room Thermostat Kit 1190114 1190114 1190114 1190114 1190114
24. Terminal Block Kit (Main) 1040240 1040240 1040240 1040240 1040240
25. Terminal Block Kit (Aux) N/A N/A N/A 1040062 1040062
26. Fan Support Bracket 5940220 5940220 5940220 5940220 5940220
27. Element Retainer 5941104 5941104 5941104 5941104 5941104
28. Bimetallic Linkage 5940001 5940001 5940001 5940001 5940001
29. *Charge Control Circuit Board * * * * *
30. Center Fan Track Assembly N/A N/A N/A 5940242 N/A
31. Wall Support Clip 5941020 5941020 5941020 5941020 5941020
32. High Limit Guide Tube, Right 1105005 1105006 1105007 1105008 1105011
" High Limit Guide Tube, Left N/A N/A N/A 1105009 1105010
33. Core Charging High Limit 1012000 1012000 1040056 1012000 1012000
34. Core Charging High Limit Mtg. Brkt. 5940190 5940190 5940190 5940190 5940190
38. T-Block Mounting Bracket (Main) N/A N/A N/A N/A N/A
" T-Block Mounting Bracket (Aux.) N/A N/A N/A N/A 5941084
39. Bimetallic Coil Assembly 1190015 1190015 1190015 1190015 1190015
40. Umbilical Cord 1040260 1040261 1040261 1040263 1040263
41. 1" Insulation Blanket, Right Inner/Middle 1050080 1050080 1050080 1050080 1050080
" 1" Insulation Blanket, Left Inner/Middle 1050080 1050080 1050080 1050080 1050080
42. 1" Insulation Blanket, Right Outer 1050009 1050009 1050009 1050009 1050009
" 1" Insulation Blanket, Left Outer 1050009 1050009 1050009 1050009 1050009

Page 10
(;73DUWV/LVW&RQWLQXHG«
DWG.
REF.
NO. DESCRIPTION 212EXT
ITEM NO.
312EXT
ITEM NO.
412EXT
ITEM NO.
512EXT
ITEM NO.
612EXT
ITEM NO.
43. Block Insulation, Right (Std Output) 1052040 1052040 1052040 1052040 1052040
" Block Insulation, Left (Std Output) 1052022 1052022 1052022 1052022 1052022
46. Grill 5942080 5942081 5942082 5942083 5942084
47. *Fan Assembly w/o Fan (Std Output) 1040092 1040093 1040094 1040095 1040109
48. *Fan Wiring Harness (Std Output) 1040290 1040291 1040292 1040293 1040294
49. Charge Control Sequencer N/A N/A 1040000 1040000 1040000
50. *Red Service Light (240VAC) 1015021 1015021 1015021 1015021 1015021
51. Painted Panel, Right 5942040 5942040 5942040 5942040 5942040
52. Painted Panel, Left 5941140 5941140 5941140 5941140 5941140
53. *Fan with Motor & Shroud (230 VAC) 1022000 1022007 1022004 1022004 1022007
54. *Heating Element (1200W, 240 VAC) 1040079 1040079 1040079 1040079 1040079
55. Sequencer Mounting Bracket N/A N/A 5941082 5941082 5941082
56. Fan High Limit Switch 1012013 1012013 1012013 1012013 1012013
57. T-Block Mounting Bracket, Center N/A N/A N/A 5941083 N/A
58. Wall Bracket Hardware Kit 1190002 1190002 1190002 1190002 1190002
59. Green Charge Light, Optional 1015026 1015026 1015026 1015026 1015026
60. Right Panel, Front 5942047 5942047 5942047 5942047 5942047
61. Charge Control Assy (130o)1040282 1040282 1040282 1040282 1040282
62. Charge Control Assy (265o)1040305 1040305 1040305 1040305 1040305
63. Charge Control Assy (190o)1040284 1040284 1040284 1040284 1040284
64. Cord Assembly (120 VAC) 1015000 N/A N/A N/A N/A
65. Room Temp. Control Knob 1154006 1154006 1154006 1154006 1154006
66. Tip Over Switch (120V plug-in units) 1024018 N/A N/A N/A N/A
67. Outdoor Temperature Sensor, optional 1040300 1040300 1040300 1040300 1040300
68. Circuit Board Mounting Plate 5942087 5942087 5942087 5942087 5942087
69. *Circuit Board Face Plate * * * * *
70. Low Voltage Wire Channel 5942090 5942090 5942090 5942090 5942090
71. Outdoor Sensor Interface Board, optional 1043020 1043020 1043020 1043020 1043020
72. Security Base Shell (120V plug-in units) 5942110 N/A N/A N/A N/A
73. Security Base Filler (120V plug-in units) 1190020 N/A N/A N/A N/A
74. *Time Clock (240 VAC), optional 1301006 1301006 1301006 1301006 1301006
75. Peak Control Sequencer, optional 1309006 1309006 1309006 1309006 1309006
76. Utility Mode Timer, optional 1018015 1018015 1018015 1018015 1018015
77. Peak Override Wind-up Timer, optional 1024020 1024020 1024020 1024020 1024020
78. Multi-Mode Interface Board, optional 1023030 1023030 1023030 1023030 1023030
*Contact factory with model and serial number as optional voltages, wattages, high output fan assemblies and circuit
board configurations are available.