NTI Matrix M100 Installation And Operating Instructions Manual page 47

Matrix Installation and Operation Instructions
Symptom Detected Problem
Communication Error with HRV
AL1
Plenum Temperature Limit of
AL2
The Control has locked out DHW
AL5
due to the demand lasting longer
'Boiler Control Error'
AL7 Fan controller has failed to receive
run status from Boiler Control.
'Furnace Blower Error'
AL8
Blower has failed to meet a
(& Blower Off)
'Furnace Blower Error'
AL8 Control has failed to sense that the
(& Blower On) blower has reached a minimum
F3.5 Flashing Lack of 24 V at fan controller
The Fenwal controller thinks that
Two Flashes
there is a flame prior to ignition.
on Fenwal
Indicates Ignition Lockout.
Three
Flashes on
Fenwal
1.
2.
3.
1.
2.
3.
160ºF Exceeded
1.
2.
"DHW Time-Out"
than 2.5 hours.
3.
1.
2.
1.
2.
minimum speed. 3.
1.
2.
speed.
1.
If the combustion sequence is normal, and there is no flame prior to ignition, the
Fenwal control is defective, and must be replaced.
If the condensate drain gets blocked, the boiler will become flooded and terminate
operation as the flame rod becomes immersed. This will damage the flame probe.
To correct, free the drain blockage, and permanently prevent it from reoccurring.
Remove and dry off the probe. Reinstall the probe and try for ignition, if it fails to
stay lit, leave the fan run for up to three hours to dry out the insulation and probe.
1.
"Ignition Lockout"
2.
3.
4.
5.
Check wiring connections between HRV and Fan Controller.
Check door switch on HRV.
Cycle power to appliance; contact NTI.
If plenum is hot, check operation of blower fan; contact NTI.
If plenum is not hot, check plenum sensor and wiring for shorts or damage.
Remove plenum sensor, PSO should be displayed, if so replace plenum
sensor, if not inspect wiring from Terminal Strip to Fan Control. Replace Fan
Control if necessary.
Reset the AL5 error by resetting the power or cycling the DHW call. Check
for proper operation of the DHW call.
Matrix units are provided with an integrated DHW flow meter, if the control is
registering a flow rate when the water is turned off; disconnect the electrical
lead to the flow meter. If the indicated flow rate drops to 0, replace flow
meter, if not, replace fan controller.
Ensure nothing is connected to the FS terminal of the terminal strip (unless
using a DHW tank aqua-stat to trigger a demand – check operation of aqua-
stat).
Check for error code on Boiler Control.
Check control wiring from Boiler Control to Fan Control (Pins 17 and 18 on
Fan Control – See wiring schematic in Section 8.2).
Check for 120V to blower; ensure door switches are making the circuit.
Check wiring from Pin 6 at Fan Control (white wire) to Pin 15 at blower
motor.
Check for 24VDC at blower Pin 15, if present replace blower, if not replace
Fan Control.
Check wiring from Pin 5 at Fan Control (black wire), to Pin 16 at blower
motor.
Check for 3-5VDC at blower Pin 16, if present replace blower, if not replace
Fan Control.
Check/Replace 2A fuse – blown fuse indicates 24V supply shorted to
ground, or excessive load.
Reset Boiler so it will attempt to ignite.
Check for proper operation of ignition components. Make sure igniter glows
and gas valve opens.
Check for proper line pressure at gas valve when it opens.
If boiler lights check for flame signal between FC1 and FC2 on Fenwal
control (If lower then 1.2 DC µAmps see " Boiler will not stay lit ").
Check combustion properties.
47
Solution