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KHA SERIES
Lennox KHA SERIES User Manual
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Page 44
ELECTRONIC OR ELECTROMECHANICAL THERMOST
A
T
POWER:
1
.
T
erminal s
tr
ip
T
B1
found
in
the
m
ain c
ontr
ol
b
ox
supplies
thermostat
c
omponents
with
2
4V
AC.
OPERA
TIO
N:
2.
TB1 receives dat
a from the
elec
tronic thermostat A2
(Y1, Y2, W1, W2, G)
and energizes the appropriate components
for heat or cool demand.
43
45
Table of Contents
Table of Contents
1
KHA Series
1
Options/Accessories
2
Specifications - Direct Drive Blower
5
Specifications - Belt Drive Blower
6
Blower Data - Direct Drive - KHA024-030
7
Blower Data - Direct Drive - KHA036-048
8
Blower Data - Belt Drive - KHA036
9
Blower Data - Belt Drive - KHA048
10
Blower Data - Belt Drive - KHA060
11
Blower Data - Belt Drive - Downflow - KHA072
12
Blower Data - Belt Drive - Horizontal - KHA072
13
Specifications
13
Blower Data
14
Electrical Data
15
Electric Heat Data
15
Electrical Accessories
15
Electrical Data KHA036S
16
Electrical Data KHA048S
17
Electrical/Electric Heat Data KHA060S
18
Electrical/Electric Heat Data KHA0S72
19
Electric Heat Capacities
20
KHA Parts Arrangement
21
KHA Control Box
21
I Unit Components
22
KHA Plumbing and S49 Freezestat Location
24
Cooling Components
25
Determining Unit CFM − Direct Drive Blowers
26
Blower Operation
26
Blower Compartment
26
Operation/Adjustment
26
Determining Unit CFM − Belt Drive Blowers
27
Blower Belt Adjustment
27
Direct Drive High Static Applications
27
Minimum and Maximum Pulley Adjustment
27
Check Belt Tension
28
Field−Furnished Blower Drives
28
Blower Assembly
28
Pulley Alignment
28
Optional Electric Heat Components
29
Electric Heat Vestibule
30
Heating Start up
31
Start up Operation
31
Preliminary and Seasonal Checks
31
Placement and Installation
31
KHA024S/KHA030S/KHA048S/KHA060S Normal Operating Pressures
32
System Service Checks
32
Unit Filters
33
Approach Temperature
33
Maintenance
33
Remove Filter
34
Clean Outdoor Coil
34
Accessories
35
Optional Sensors
36
Outdoor Air Damper
36
Economizer Controls
36
DCV Set and Max Settings
37
A6 Enthalpy Controller
37
Damper Minimum Position
37
Free Cooling Setpoint
37
Economizer Operation
38
Outdoor Air Not Suitable
38
Outdoor Air Suitable
38
Calculate Minimum Fresh Air Percentage Mixed and Return Air Temperature
38
Ecoomizer Operation
39
Power Exhaust Fan
39
Wiring Diagrams/Sequence of Operation
40
KHA024, 036, 048, 060 P Voltage
40
KHA036, 048, 060 y Voltage
41
KHA036, 048, 060 G, J Voltage
42
Sequence of Operation KHA024/060
43
Electronic or Electromechanical Thermostat
44
Economizer
45
Sequence of Operation
45
T1EH−7.5, 10, 15, 22.5 Kw P Voltage
46
T1EHA−7.5, 15, 22.5Kw y Voltage KHA Series Units
47
T1EHA−7.5, 15, 22.5Kw G, J Voltage KHA Series Units
48
Sequence of Operation −T1EH 7.5, 10, 15, 22.5Kw − P Voltage
49
Sequence of Operation −T1EH 7.5, 15, 22.5Kw − Y, G, J Voltage
49
4
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Lennox KHA SERIES Specifications
General
Brand
Lennox
Model
KHA SERIES
Category
Heat Pump
Language
English
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