Adjustment Of Temperature Rise; Troubleshooting; Cooling Troubleshooting Guide - York SUNLINE DCG Series Installation Manual

To find the Btu input, multiply the number of
NOTE:
cubic feet of gas consumed per hour by the
Btu content of the gas in your particular locality
(contact your gas company for this information
- it varies widely from city to city.)
TABLE 31: GAS RATE - CUBIC FEET PER HOUR
Seconds for one
rev.
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
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 fur-
nace 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 fur-
nace) must lie within the range shown on the rating
plate and the data in the Gas Heat Application Table 4.
48
Size of Test Dial
1/2 cu. ft. 1 cu. ft.
180 360
150 300
129 257
113 225
100 200
90 180
82 164
75 150
69 138
64 129
60 120
56 113
53 106
50 100
47 95
45 90
43 86
41 82
39 78
37 75
36 72
35 69
34 67
32 64
31 62
30 60
CFM
After the temperature rise has been determined, the
cfm can be calculated as follows:
1
After about 20 minutes of operation, determine the fur-
nace 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 tempera-
ture rise; decrease the blower cfm to increase the rise.
Refer to the Blower Motor and Drive Data Table 25.

TROUBLESHOOTING

COOLING TROUBLESHOOTING GUIDE

Troubleshooting of components may require
opening the electrical control box with the power
connected to the unit. Use extreme care when
working with live circuits! Check the unit
nameplate for the correct line voltage and set
the voltmeter to the correct range before making
any connections with line terminals.
Shut off all electric power to the unit prior to
any of the following maintenance procedures
to prevent personal injury.
Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause
improper and dangerous operation, which could
cause injury to person and/or damage unit com-
ponents. Verify proper operation after servicing.
On calls for cooling, if the compressors are operating
but the supply air blower motor does not energize after
a short delay (the room thermostat fan switch is in the
"AUTO" position).
1. Turn the thermostat fan switch to the ON position.
If the supply air blower motor does not energize, go
to Step 3.
2. If the blower motor runs with the fan switch in the ON
position but will not run after the compressor has
energized when the fan switch is in the AUTO posi-
290699-YIM-B-0607
Btuh Input x 0.8
=
o
x F Temp Rise
108 . .
Unitary Products Group