Unit Components - Modine Manufacturing HD Series Installation And Service Manual

ConTrol operATIng seQuenCe / unIT ComponenTs
ConTrol operATIng seQuenCe
Upon a call for heat from the thermostat, power is supplied to
the power exhauster motor. The unit will go through a purge
period and then the direct spark igniter will be energized. At the
same time, the main valve in the combination control valve will
open to allow gas to flow to the burners. If the fan motor has
figure 15.1 - major gas, electrical service, safety and other Components
➁
➀
1. Power Exhauster
2. Pressure Switch
3. Integrated Direct Spark Control
Board
Control options
single-stage, direct spark Ignition, 100% shut-off with Continuous retry
- Utilizes a single-stage combination gas control with ignition control.
Gas is lit with a direct spark igniter on call for heat.
Two-stage, direct spark Ignition, 100% shut-off with Continuous retry
- Utilizes a two-stage combination gas control with built-in ignition control.
Firing rate is 100% and 50% of full rated input. Gas is lit with a direct spark
igniter on call for heat.
performance - model Hd
Hd30
models
30,000
Btu/Hr Input
24,000
Btu/Hr Output
505
Entering Airflow (CFM)
523
Outlet Velocity
Air Temp. Rise (°F) 44
Mounting Height (Max ft.) 10
25
Heat Throw (ft.)
1/15
Horsepower
1,550
RPM
Motor
Data S.P.
Type
2.4
Amps
Unit Total Amps 3.7
➃
➉
➂
➄
4. Combination Gas Control
5. Control Transformer
6. Flame Sensor (hidden)
7. Flame Rollout Switch
Control description
Hd45 Hd60 Hd75 Hd100
45,000 60,000 75,000 100,000 125,000
36,000 48,000 60,000 80,000 100,000
720 990 1,160 1,490
749 653 769 565
46 45 48 50
10 12 14 12
27 36 38 42
1/15 1/12 1/12 1/12
1,550 1,625 1,625 1,050
S.P. P.S.C. P.S.C. S.P.
2.4 1.2 1.2 2.7
3.7 2.5 2.5 4.7
not all ready started it will start shortly. If a flame is not sensed
for any reason the main valve will close and there will be a
short purge period before ignition is tried again. If the flame is
not sensed after four tries, there will be at least a one hour wait
before ignition is tried again.
➈
Control service
Code no. voltage
11 115V
21 115V
12 115V
22 115V
performance - model HdB
Hd125 models
Btu/Hr Input
Btu/Hr Output
1,980 Air Flow CFM Range
747
Static Pressure (max)
47 Air Temp. Rise (°F)
16 Motor Speeds
56
Horsepower
1/8
RPM
Motor
1,550
Data
P.S.C.
2.2
Amps
4.2 Unit Total Amps
6-583.6
➅
➆
8. Auto Reset Limit Control (hidden)
9. Direct Spark Igniter (hidden)
10. Manual Reset Control (hidden,
propeller 100-125 only)
Thermostat Type of
voltage gas
24V natural
24V propane
24V natural
24V propane
HdB60 HdB75 HdB100
60,000 75,000 100,000
48,000 60,000 80,000
635-1100 795-1390 1060-1850 1240-2050
0.7 0.7
40-70 40-70 40-70
3 3
1/4 1/3
Max Max
Max
1,100 1,100 1,100
P.S.C. P.S.C. P.S.C.
Type
5.4 7.1
6.4 8.1 11.5
➇
model
size
30-125
30-125
75-125
75-125
HdB125
125,000
100,000
0.8 0.8
45-75
3 3
1/2 1/2
Max
1,100
P.S.C.
9.5 9.5
11.5
15