Test Input Functionality - York CZH Installation Manual

835965-UIM-C-0814
NOTICE
On 5 Ton unit the outdoor fan motor is a permanent magnet DC
brushless type. The motor requires a separate Electronic Control to
operate. Do not attempt to replace this motor with a typical PSC
type. Damage to Electronic Control may result.
3. If the coil needs to be cleaned, use clean water to wash dust, dirt,
and debris from outdoor condensing coil.
NOTICE
DO NOT use coil cleaners to clean outdoor condensing coil. clean-
ers containing HF-, hydroxides, chlorides, and sulfates can greatly
reduce the lifetime of the aluminum condensing coil.
4. Refer to the furnace or air handler instructions for filter and blower
motor maintenance.
TABLE 1: R-410A Saturation Properties
PRESSURE
TEMP. °F
PSIG
45 129.70
46 132.20
47 134.60
48 137.10
49 139.60
50 142.20
51 144.80
52 147.40
53 150.10
54 152.80
55 155.50
56 158.20
57 161.00
58 163.90
59 166.70
SECTION VIII: AC CONTROL BOARD
FUNCTIONALITY
ANIT-SHORT CYCLE DELAY
The control includes a five-minute anti-short cycle delay (ASCD) timer
to prevent the compressor from short cycling after a power interruption
or thermostat signal interruption. The ASCD timer is applied when the
control is first powered from the indoor unit thermostat and immediately
following the completion of a compressor run cycle. The compressor
and the outdoor fan will not operate during the five minutes that the
timer is active.
The ASCD timer can be bypassed by connecting the TEST terminals
for three seconds while the thermostat is calling for compressor opera-
tion (Y1 input signal energized).
18
PRESSURE
TEMP. °F TEMP. °F
PSIG
60 169.60
61 172.60
62 175.50
63 178.50
64 181.60
65 184.60
66 187.70
67 190.90
68 194.10
69 197.30
70 200.60
71 203.90
72 207.20
73 210.60
74 214.00
5. The indoor coil and drain pan should be inspected and cleaned reg-
ularly to prevent odors and assure proper drainage.
Do not connect manifold gauges unless trouble is suspected.
Approximately 3/4 ounce of refrigerant will be lost each time a stan-
dard manifold gauge is connected.
IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-
CHARGE REFRIGERANT INTO THE OPEN AIR DURING
REPAIR, SERVICE, MAINTENANCE OR THE FINAL DISPOSAL
OF THIS UNIT.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND THE
OWNER HAS BEEN FULLY INSTRUCTED, SECURE THE
OWNER'S APPROVAL.
PRESSURE
TEMP. °F
PSIG
75 217.40 90
76 220.90 91
77 224.40 92
78 228.00 93
79 231.60 94
80 235.30 95
81 239.00 96
82 242.70 97
83 246.50 98
84 250.30 99
85 254.10 100
86 258.00 101
87 262.00 102
88 266.00 103
89 270.00 104
LOW VOLTAGE DETECTION
The control monitors the transformer secondary (24 VAC) voltage and
provides low voltage protection for the AC unit and its components. In
particular, the control prevents contactor chatter during low voltage con-
ditions. If the voltage drops below approximately 19 VAC, the control
will continue to energize any relays that are already energized but will
not energize any additional relays until the voltage level increases. If
the voltage drops below approximately 16 VAC, the control will immedi-
ately de-energize the relay outputs and will not energize any relays until
the voltage level increases. The control will store and display the appro-
priate fault codes when low voltage conditions occur.
TEST INPUT
The control includes a TEST input connector that can be used for vari-
ous testing functions during installation and service. Table 2 summa-
rizes the behavior of the control when the two TEST pins are
connected.
PRESSURE PRESSURE
TEMP. °F
PSIG
274.10 105
278.20 106
282.30 107
286.50 108
290.80 109
295.10 110
299.40 111
303.80 112
308.20 113
312.70 114
317.20 115
321.80 116
326.40 117
331.00 118
335.70 119
Johnson Controls Unitary Products
PSIG
340.50
345.30
350.10
355.00
360.00
365.00
370.00
375.10
380.20
385.40
390.70
396.00
401.30
406.70
412.20