50A65-843
Universal Integrated Furnace Control
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
The 50A65-843 is an automatic gas interrupted ignition control that employs a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner, inducer, and fan.
Signals interpreted during continual surveillance of the thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shut-off during normal operation.
These controls incorporate system fault analysis for quick gas flow shut-off, coupled with automatic ignition retry upon sensing a fault correction.
PRECAUTIONS
Installation should be done by a qualified heating and air conditioning contractor or licensed electrician.
If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air conditioning contractor or licensed electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and ordinances.
This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.
Following installation or replacement, follow manufacturer’s recommended installation/service instructions to ensure proper operation.
CAUTION
Do not short out terminals on gas valve or primary control. Short or incorrect wiring may damage the thermostat.
CONTENTS |
|
Description ........................................................ |
1 |
Precautions ....................................................... |
1 |
Specifications .................................................... |
2 |
Installation ......................................................... |
3 |
Mounting & Wiring |
|
Operation .......................................................... |
6 |
Mounting Hole Template .................................... |
8 |
WARNING
Failure to comply with the following warnings could result in personal injury or property damage.
FIRE HAZARD
•Do not exceed the specified voltage.
•Protect the control from direct contact with water (dripping, spraying, rain, etc.).
•If the control has been in direct contact with water, replace the control.
•Label all wires before disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
•Route and secure wiring away from flame.
SHOCK HAZARD
•Disconnect electric power before servicing .
•Ensure proper earth grounding of appliance.
•Ensure proper connection of line neutral and line hot wires.
EXPLOSION HAZARD
•Shut off main gas to appliance until installation is complete.
PART NO. 37-6270E
Replaces 37-6270D 0701
SPECIFICATIONS
ELECTRICAL RATINGS [@ 77°F (25°C)]:
Input Voltage: 25 VAC 50/60 Hz
Max. Input Current @ 25 VAC: 0.45 amp Relay Load Ratings:
Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf Ignitor Relay: 2.0 amp @ 120 VAC 50/60 Hz
(resistive)
Flame Current Requirements:
Minimum current to insure flame detection: 1 µa DC* Maximum current for non-detection: 0.1 µa DC* Maximum allowable leakage resistance: 100 M ohms
*Measured with a DC microammeter in the flame probe lead
OPERATING TEMPERATURE RANGE:
-40° to 175°F (-40° to 80°C)
HUMIDITY RANGE:
5% to 93% relative humidity (non-condensing)
MOUNTING:
Surface mount multipoise |
|
Timing Specs: (@ 60 Hz**) |
|
|
maximum |
Flame Establishing Time: |
0.8 sec |
Flame Failure Response Time: |
2.0 sec |
**At 50 Hz, all timing specifications should be increased by 20%
Gases Approved: Natural, Manufactured, Mixed, Liquified Petroleum, and LP Gas Air Mixtures are all approved for use.
TIMING SPECIFICATIONS
(All times are in seconds, unless noted otherwise)
|
50A65-843 |
|
|
|
|
PRE-PURGE |
30 |
|
|
|
|
IGNITOR WARM-UP |
20 |
|
|
|
|
IGNITION ACTIVATION |
1 |
|
PERIOD |
||
|
||
|
|
|
TRIAL FOR IGNITION |
4 |
|
PERIOD |
||
|
||
|
|
|
RETRIES |
2 times |
|
|
|
|
VALVE SEQUENCE PERIOD |
12 |
|
|
|
|
INTERPURGE |
60 |
|
|
|
|
POST-PURGE |
15 |
|
|
|
|
LOCKOUT TIME |
300 |
|
|
|
|
HEAT DELAY-TO-FAN-ON* |
30, 45 |
|
|
|
|
HEAT DELAY-TO-FAN-OFF* |
60/90/ |
|
120/180 |
||
|
||
|
|
|
COOL DELAY-TO-FAN-ON |
5 |
|
|
|
|
COOL DELAY-TO-FAN-OFF* |
45, 90 |
|
|
|
|
AUTO RESET |
60 minutes |
|
|
|
|
HUMIDIFIER |
YES |
|
|
|
|
ELECTRONIC AIR CLEANER |
YES |
|
|
|
*These times will vary depending on option switch position. The control is factory-set at 30 seconds heat delay- to-fan-on, 180 seconds heat delay-to- fan-off and 45 seconds cool delay-to- fan-off. See OPERATION section for further information.
2
INSTALLATION
|
WARNING |
|
MOUNTING AND WIRING |
||
|
|
All wiring should be installed according to local and national |
|||
|
|
electrical codes and ordinances. |
|||
|
|
|
|
|
The control must be secured to an area that will experience a |
|
|
|
|
|
minimum of vibration and remain below the maximum ambient |
|
|
|
|
|
temperature rating of 175°F. The control is approved for mini- |
|
|
|
|
|
mum ambient temperatures of -40°F. |
|
FIRE HAZARD |
||||
|
When mounting the control, any orientation is acceptable. |
||||
|
• Do not exceed the specified voltage. |
Choose a location that will not damage, obstruct or place stress |
|||
|
• Replace existing control with exact model and |
on the control’s terminations, system wiring harness or system |
|||
|
dash number. |
components. After finding a suitable location, drill four (4) 1¦8” |
|||
|
• Protect the control from direct contact with water |
holes for mounting control. To ensure proper mounting hole |
|||
|
(dripping, spraying, rain, etc.). |
locations, there is a mounting hole template on page 8 of this |
|||
•Label all wires before disconnection when servic- instruction sheet. Detach the page with the template from the ing controls. Wiring errors can cause improper instruction sheet and apply it to the mounting location. When
|
and dangerous operation. |
drilling the holes, take care so that the transformer, wiring |
|
• |
Route and secure wiring away from flame. |
harness or other system components are not damaged. Four (4) |
|
SHOCK HAZARD |
#8 sheet metal screws are provided to complete the installation. |
||
Refer to the wiring diagram and wiring table when connecting |
|||
• |
Disconnect electric power before servicing . |
||
the 50A65 control to other components of the system. |
|||
• |
Ensure proper earth grounding of appliance. |
||
UL approved, 105°C rated 18 gauge, stranded, 2¦64” thick insula- |
|||
• Ensure proper connection of line neutral and line |
|||
|
hot wires. |
tion wire is recommended for all low voltage safety circuit |
|
EXPLOSION HAZARD |
connections. Refer to 50A65 specification sheet for recom- |
||
mended terminals to mate with those on the control. |
|||
• Shut off main gas to appliance until installation is |
UL approved 105°C rated 16 gauge min., stranded, 4¦64” thick |
||
|
complete. |
insulation wire is recommended for all line voltage connections. |
|
|
|
||
|
|
Refer to 50A65 specification sheet for recommended terminals |
|
|
CAUTION |
to mate with those on the control. |
|
|
After installation or replacement, follow appliance manufacturer’s |
||
|
recommended installation or service instructions to ensure |
||
Do not short out terminals on gas valve or primary |
proper operation. |
||
control. Short or incorrect wiring may damage the |
The 50A65 has only one serviceable part–an automotive type |
||
thermostat. |
fuse, which protects the low voltage transformer from damage |
||
|
|
if its output is short-circuited. If the fuse has opened up, remove |
|
|
|
whatever caused the short circuit and replace the fuse with only |
|
|
|
a 3 Amp automotive type fuse. If the fuse is not the cause of the |
|
|
|
control’s problem, replace the entire 50A65 control. There are |
|
|
|
no other user serviceable parts. |
|
|
|
Additional jumper wires are included in this package and |
|
|
|
should be used if the original wiring does not reach the control |
|
|
|
after mounting. Refer to the furnace wiring diagram for proper |
|
|
|
connection of the wires. |
|
|
|
Some applications may require connection to terminal E33 |
|
|
|
located in the middle of the contol cover. If the control being |
|
|
|
replaced does not have this connection, it is not needed in the |
|
|
|
application and connection to terminal E33 is not required. |
|
|
|
Trane application - Jumper wire 151-2906 (provided with |
|
|
|
control) must be installed on the furnace from R01 to R02 of the |
|
|
|
12-pin connector. |
|
3
Loading...