Unit Wiring - Modine HDS Manuel D'installation Et D'entretien

UNIT WIRING

Table 14.1
Troubleshooting (continued)
TROUBLE POSSIBLE CAUSE
Unit starts but does 1. Main gas is off.
not ignite. 2. Air in gas line.
3. Main or manifold gas pressure
4. Check gas valve switch.
Unit goes through cycle 1. Reversed main power polarity
but the burners go out in 2. Unit not grounded
less then 10 seconds 3. Flame not sensed
Air circulating fan 1. Loose connections
inoperable 2. Defective Fan time delay relay
3. Defective fan motor
Wiring Diagram Selection
Since internal or factory wiring may vary depending on
controls manufacturer, the wiring diagrams must be selected
with the series identity number when installing, servicing, or
troubleshooting a unit heater control system. Wiring diagrams
that follow are for units with the corresponding series identity
number that may be found in the 5 th through the 7 th digits of
Figure 14.1
Unit Heater Wiring Diagram (Series 101)
Wiring Legend
Line 24V
Factory
Field
Wire Nut
Flame
Sensor
W
Hot
Surface
Igniter
BK
Plug
BK
Power BK
Exhaust
Motor
W
W
Plug
Honeywell
Combination
Gas Control
Y Y
Press
Limit
Switch
Control
Note to installer:
All wiring must comply with national
electric code and all local codes.
All components must agree with
their respective power source.
Use 105°C wire for replacements.
Verify the power source and the
unit polarity.
14
UNIT HEATER WIRING DIAGRAM
Fan
P
Motor
BK
W
BK
BK
W
O
R
R
BL
R
R
R R R R
Flame
Flame
Rollout
Rollout
Switch Switch
Terminal Block
(HDS ONLY)
Caution
Failure to wire this unit according
to this wiring diagram may result
in injury to the installer or user.
For deviations contact the factory.
5H79409B1 REV A
POSSIBLE REMEDY
1. Open manual gas valve .
2. Purge gas line.
3. Set gas pressures per manual instructions
4. Set gas valve switch to "ON" position
1. Black wire - HOT, White wire - NEUTRAL, Green wire - Ground
2. Ground unit and verify quality of ground connection.
3. Check flame sense probe and connection
1. Check all connections
2. Check fan time delay relay
3. Check fan motor
the serial number. For example, a unit with the serial number
"30011013605-0981" has the 5
as shown underlined above. To use the following diagram the
unit series ID must be 101.
115V/60Hz/1Ø Power
Circuit Breaker (By Others)
BK
W BK
COM
G2
24 VAC
R W G
W BK
COM
120V
R
XFMR
24V
Low Volt
Therm
(By
Others)
Single-Stage, Hot Surface Ignition, 100% Shut-Off, Multiple Retry with Auto Reset
from Lockout, Single-Phase.
th
through the 7
115V/60Hz/1Ø Power
Shown
TD Relay
TDC
L1 TR1
TR2
GR(G) Combination
Gas Control
L2(W)
L1(BK)
Combination
Gas Control
Therm
BK
24VAC
t°
R
Combination Gas Control
TR1
TR2
Pressure
Limit
Switch
Control
Flame
Sensor
Y
Indicates Terminal Board Connection
th
digits as 103
L1 L2
Circuit Breaker
(BK) (W)
(By Others)
Fan
L2
Motor
Power
Exhaust
Motor
Hot Surface
Igniter
H H
115V
Xfmr
24V
COM
TD
W
G
Relay
Flame Flame
Rollout Rollout
Switch Switch