|
 Maintenance and Trouble Shooting
1. Check Fit: The heater I.D. must be the same as the O.D. of the
cylinder.
2. Secure
Firmly: To compensate for normal expansion, retighten periodically.
Cycling and normal metal expansion may cause the heaters to loosen.
3.
Eliminate Contamination: Oil, plastic, dirt, etc., will carbonize and
shorten heater life.
4.
Maintain Proper Voltage: The heater should be rated for the highest
voltage anticipated. Operation of a 220 Volt heater on 240 Volt will
raise the wattage by approximately 18%, increasing watt density and
reducing heater life.
5. Provide
Proper Maintenance:
1. Tighten screw terminals firmly, but avoid excessive
pressure.
2. Protect leads from abuse and abrasion.
3. Maintain temperature controls and accessories in good
working condition to avoid over-temperature operating conditions.
6.
Do not open one piece band heaters or internal damage may result. If a
Full Band Heater cannot be installed over the end of the cylinder, then
use a Split Case or Half Band Heater for best results.
7. Trouble
Shooting: Check wiring for poor connections or open control if heater
fails to heat when initially energized. Sustained high operating
temperature may reduce heater life. If terminals oxidize, tighten
connections and check for proper wire size.
|
Physical
Limitations of Mica Band Heaters
Full Band: 21-1/2" Maximum Diameter
Half Band: 43-1/2" Maximum Diameter
| Termination |
Min.
Dia. |
Min
Width |
| Figure |
Style |
Full
Band |
Half
Band |
| 1 |
Leads |
3/4" |
1-3/4" |
3/4" |
| T1 |
Screw
Terminals |
1-1/2" |
2" |
1" |
| T2 |
1-1/2" |
3" |
2-1/2" |
| T3 |
1-1/2" |
3" |
1" |
| 3 |
Braided Leads |
3/4" |
1-3/4" |
3/4" |
| 5 |
Leads |
1-1/2" |
3" |
1" |
| 6 |
Armor Leads |
1-1/2" |
3" |
1" |
| 7P |
Armor w/Plug |
1-1/2" |
3" |
1" |
| 8 |
Mounted Flange |
3/4" |
1-3/4" |
3/4" |
| 11 |
Wedge Mount |
1" |
-- |
3/4"
(6"max.) |
| 12 |
Hinged Half Band |
-- |
1-3/4" |
1-1/2" |
| 16 |
Braided Leads |
1-1/2" |
3" |
1" |
| 17 |
T1 & T3 |
1-1/2" |
-- |
1" |
| T2 |
1-1/2" |
-- |
2-1/2" |
| Leads |
1-1/2" |
-- |
3/4" |
| 110 |
EuroPlug |
3-1/2" |
-- |
1-1/8" |
| 115 |
EuroPlug |
4" |
-- |
2" |
Typical
Thickness is 5/32"
It is not recommended to use Mica Band
Heaters more than 3" wide. 1 - 3" wide heaters have
shown to be more efficient and economical. |
Recommended Maximum Watt Density
Steel
Block Temp in ºF
With SCR or SSR control output, watt
density can be increased up to 30%. |
|
I.D. |
Standard Gap |
 |
Watt Density |
|
>3/4" - 5" |
1/4" |
|
> 5" - 10" |
1/2" |
|
> 10" - 16" |
3/4" |
|
> 16" |
1" |
|
