Modine Manufacturing HD Installation And Service Manual - page 17
17
3. Check if there is flow at the vent terminal, if there is flow
replace the pressure switch, if there is no flow check the
power exhauster.
Hot Surface igniter
The hot surface igniter (located behind the access panel and
under the combination gas control) will ignite the gas. It is a
ceramic device that will glow red when it heats up to ignite the
gas. If the hot surface igniter does not glow red after the purge
period, check the resistance of the igniter. If the resistance is
greater than 100 ohms then the igniter must be replaced.
To replace the igniter; unplug the lead from the igniter to the
combination gas control, remove the two screws holding the
igniter (if desired you can remove the manifold assembly to get
easier access to the screws). VERY CAREFULLY install the
new igniter into the panel and plug into the wire harness
LED Diagnostic Capability
The LED on top of the combination gas control indicates the
condition of the control system. The following codes and what
they mean follows:
(this information also appears on the unit)
FOR SERVICE
If a qualified service person cannot solve the problem, consult
your local gas company or local Modine representative.
When servicing, repairing or replacing parts on these units
always give the complete Model Number and Serial Number
from the unit rating plate.
The samples below show where these numbers can be found.
Serial Number Designations
(Remove access cover to locate)
01 01 101 01 97 1000
MOTOR
SUPPLIER CODE
01- Century
05- Universal
etc.
YEAR OF
MANUFACTURE
97- 1997
98- 1998
etc.
WEEK OF
MANUFACTURE
01- 1st week of year
26- 26th week of year.
SEQUENCE
NUMBER
FAN SUPPLIER
CODE
01- Revcor
08- Brookside
etc.
SERIES IDENTITY NUMBER
Identifies which series of controls
were furnished on the unit.
Model Number Designations
(Remove access cover to locate)
HD - Tubular
Propeller Unit
MBH INPUT
30 - 30,000 Btu/hr input
45 - 45,000 Btu/hr input
60 - 60,000 Btu/hr input
75 - 75,000 Btu/hr input
HEAT EXCHANGER TYPE
A - Aluminized
H - Hot surface ignition
CONTROL CODE
TYPE
34 - 115V/25V single
stage hot surface ignition,
100% shut-off with
lockout - natural gas.
74 - 115V/25V single
stage hot surface ignition,
100% shut-off with
lockout - propane gas.
POWER CODE
01 -
115 volt, 60 hertz,
single phase
HD 4 5 A H 0 1 3 4
LED DIAGNOSTIC CODES
Off
No power to system
Bright-Dim
Normal operation
2 Flashes
Pressure switch closed longer than 30 seconds
3 Flashes
Pressure switch open longer than 30 seconds
4 Flashes
Limit Control or Flame Rollout Switch Open
5 Flashes
Flame signal sensed out of sequence
6 Flashes
System lockout
SERVICE INSTRUCTIONS – GENERAL