Table of Contents
Advertisement
5121817-TIM-A-0515
1. By actual measurement, it takes 38 seconds for the hand on
the 1-cubic foot dial to make a revolution with a 100,000 Btuh
furnace running. Using this information, located 38 seconds
in the first column in the table above. Read across to the
column headed "1 Cubic Foot", where you will see that 95
cubic feet of gas per hour are consumed by the furnace at
that rate. Multiply 95 X 1050 (the Btu rating of the gas
obtained from the local gas company). The result is 99,750
Btuh, which is close to the 100,000 Btuh rating of the furnace.
Adjustment Of Temperature Rise
The temperature rise (or temperature difference between the
return air and the heated air from the furnace) must lie within
the range shown on the rating plate and the data in the Gas
Heat Application Table 10.
Table 26: ZKT03 Charging Table
Air Flow
Outdoor
Indoor Db/Wb
DB
75
300 Cfm/Ton
85
80/62
95
75
300 Cfm/Ton
85
80/67
95
75
300 Cfm/Ton
85
80/72
95
75
300 Cfm/Ton
85
75/63
95
75
400 Cfm/Ton
85
80/62
95
75
400 Cfm/Ton
85
80/67
95
75
400 Cfm/Ton
85
80/72
95
75
400 Cfm/Ton
85
75/63
95
50
Discharge
Suction
Suction
Pressure
Temp.
123
49
126
50
128
52
134
56
136
56
140
58
146
61
149
62
152
63
125
50
128
51
130
52
129
52
132
52
135
54
140
58
143
59
146
59
152
63
155
64
157
65
131
53
133
54
136
55
After the temperature rise has been determined, the cfm can be
calculated as follows:
After about 20 minutes of operation, determine the furnace
temperature rise. Take readings of both the return air and the
heated air in the ducts (about six feet from the furnace) where
they will not be affected by radiant heat. Increase the blower
cfm to decrease the temperature rise; decrease the blower cfm
to increase the rise. Refer to the In Door Blower Specification
Table 17.
Charging The Unit
Charge the units to the following tables.
Liquid
Pressure
Temp.
Pressure
259
78
299
88
344
99
262
79
303
89
348
99
266
79
307
89
352
100
260
78
300
89
344
99
261
79
301
89
346
99
264
79
305
89
350
99
268
79
309
90
353
100
261
79
302
89
347
99
Btuh Input x 0.8
=
CFM
108
.
.
Delta T
Entering
Leaving
Db
Evap Db
Evap Db
-29
80
-28
80
-26
80
-24
80
-23
80
-22
80
-20
80
-18
80
-17
80
-23
75
-22
75
-21
75
-26
80
-25
80
-24
80
-22
80
-21
80
-20
80
-17
80
-16
80
-15
80
-20
75
-19
75
-18
75
Johnson Controls Unitary Products
Compressor
Amps
51
6.0
52
6.3
54
7.1
56
5.6
57
6.3
58
7.1
60
5.7
62
6.3
63
7.1
52
5.6
53
6.3
54
7.1
54
5.6
55
6.3
56
7.1
58
5.6
59
6.3
60
7.1
63
5.7
64
6.3
65
7.1
55
5.6
56
6.3
57
7.1
Advertisement
Table of Contents
