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Lennox KGB Series User Manual
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Page 74
ELECTRONIC OR ELECTROMECHANICAL THERMOST
A
T
POWER:
1.
T
erminal
strip
TB1
found
in
the main
control box
supplies
thermostat components
with
24V
AC.
OPERA
T
ION:
2.
TB1
receives data
from
the electronic
thermostat A2
(Y1,
Y2,
W1, W2,
G)
and
energizes
the
appropriate
components
for
heat or
cool
demand.
73
75
Table of Contents
Table of Contents
1
Precautions and Procedures
1
Options
2
Accessories
2
Options
8
Specifications
8
Blower Data
14
Blower
20
Belt Drive Kit Specifications - 036-074S
29
Belt Drive Kit Specifications - 072H/074H/090S
29
Ceiling Diffusers Air Resistance
30
Ceiling Diffuser Air Throw Data
30
Power Exhaust Fan Performance
30
Electrical Accessories
31
Electrical Data
31
Kgb Parts Arrangement
34
Kgb Control Box
34
Control Box Components
35
Control Transformer T1
35
Compressor Contactor K1
35
I Unit Components
35
P2 Terminal Designations
36
Gas Relay K72
36
Burner Control A3
36
Cooling Components
37
Compressor B1
37
Kgb Plumbing
38
S49 Freezestat Location
38
Freezestat S49
39
Blower Compartment
39
High Pressure Switch S4
39
Low Ambient Switches S11
39
Determining Unit CFM
40
Location of Static Pressure Readings
40
Field-Adjustable Blower Speeds
41
High Speed - All Units
41
Two-Speed Blower Operation
42
Direct Drive Blower Leads
42
Minimum and Maximum Pulley Adjustment
42
Blower Assembly
43
Measure Belt Tension
43
Pulley Alignment
43
Adjust Belt Tensioner
44
Install Belt
44
Drive Component Manufacturer's Numbers
45
Gas Heat Components
46
Heat Exchanger
46
Burner Box Assembly
46
Primary High Temperature Limit S10
47
Flame Rollout Limit Switch S47
47
Combustion Air Prove Switch S18
47
Combustion Air Inducer B6
47
Heating Start up
48
Preliminary and Seasonal Checks
48
Start up - Operation
48
Placement and Installation
48
Placing Unit in Operation
49
Gas Valve Operation
49
Turning off Gas to Unit
49
Charging
50
Cooling Start up
50
Safety or Emergency Shutdown
50
KGB/KCB024 Normal Operating Pressures
51
KGB/KCB 024 Charging Curves
51
KGB/KCB030 Normal Operating Pressures
52
KGB/KCB 030 Charging Curves
52
KGB/KCB 036 Charging Curves
53
KGB/KCB036 Normal Operating Pressures
53
KGB/KCB048 Normal Operating Pressures
54
KGB/KCB 048 Charging Curves
54
KGB/KCB 060 Normal Operating Pressures
55
KGB/KCB 060 Charging Curves
55
KGB/KCB 072 Charging Curves
56
KGB/KCB 074S & H Normal Operating Pressures
57
KGB/KCB074S & H Charging Curves
57
KGB/KCB 090 Normal Operating Pressures
58
KGB/KCB 090 Charging Curves
58
Refrigerant Charge and Check - Fin/Tube Coil
59
Gas Piping
60
Testing Gas Piping
60
System Service Checks
60
Heating System Service Checks
60
Testing Gas Supply Pressure
61
Check and Adjust Manifold Pressure
61
Proper Gas Flow
61
Flame Sensing
61
Cooling System Service Checks
62
Lubrication
62
Charging
62
Maintenance
62
Accessories
63
Assembled Roof Mounting Frame
64
Outdoor Air Damper
64
Typical Flashing Detail
64
Free Cooling Setpoint
65
Economizer Controls
65
Optional Sensors
65
A6 Enthalpy Controller
65
DCV Set and Max Settings
66
Economizer Operation
67
Outdoor Air Not Suitable
67
Outdoor Air Suitable
67
Power Exhaust Fan
68
Optional Cold Weather Kit
68
Control Systems
68
Smoke Detectors A17 and A64
68
Wiring Diagrams and Sequence of Operation
69
Kgb024/060 P Voltage Unit Diagram
69
KGB024/090 P, Y, G, J & M Voltage Sequence of Operation
71
4
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Lennox KGB Series Specifications
General
Brand
Lennox
Model
KGB Series
Category
Heat Pump
Language
English
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