| OF2 |
|
|
OF1 |
|
|
|
O | R T2 Y TI DFT | C | TEST 30 50 90 |
|
|
| W1 |
O |
|
|
|
R |
|
|
|
W2 |
|
|
|
Y |
|
|
|
C |
|
|
|
| CES0110063, |
| |
| CES0130024 |
|
A91444
Table 3—Defrost Control Speedup-
Timing Sequence
PARAMETER | MINIMUM | MAXIMUM | SPEEDUP | |
(MINUTES) | (MINUTES) | (NOMINAL) | ||
| ||||
27 | 33 | 7 sec | ||
45 | 55 | 12 sec | ||
81 | 99 | 21 sec | ||
9 | 11 | 2 sec | ||
5 minutes | 4.5 | 5.5 | 1 sec | |
|
|
|
|
Fig. 10—Defrost Control
6.When you hear reversing valve change position, remove screwdriver immediately; otherwise, control will terminate normal
NOTE: Length of defrost cycle is dependent upon length of time it takes to remove screwdriver from test pins after reversing valve has shifted.
7.Unit will remain in defrost for remainder of
8.Turn off power to outdoor unit and reconnect fan motor lead to OF2 on control board. (See Fig. 10.)
Step 14—Check Charge
Factory charge is shown on unit rating plate. To check charge in cooling mode, refer to Cooling Only Procedure. To check charge in heating mode, refer to Heating Check Chart Procedure.
NOTE: If superheat- or
EXAMPLE:
To calculate additional charge required for a
25 ft – 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge
Units installed with cooling mode TXV require charging with the subcooling method.
1.Operate unit a minimum of 10 minutes before checking charge.
2.Measure liquid
3.Measure
4.Refer to unit rating plate for required subcooling temperature.
5.Refer to Table 4. Find the point where required subcooling temperature intersects measured liquid
6.To obtain required subcooling temperature at a specific
Table 4—Required Liquid-Line Temperature (°F)
LIQUID |
| REQUIRED SUBCOOLING |
| |||
PRESSURE AT |
|
| TEMPERATURE (°F) |
| ||
SERVICE VALVE |
|
|
|
|
|
|
5 |
| 10 | 15 |
| 20 | |
(PSIG) |
|
| ||||
134 | 71 |
| 66 | 61 |
| 56 |
141 | 74 |
| 69 | 64 |
| 59 |
148 | 77 |
| 72 | 67 |
| 62 |
156 | 80 |
| 75 | 70 |
| 65 |
163 | 83 |
| 78 | 73 |
| 68 |
171 | 86 |
| 81 | 76 |
| 71 |
179 | 89 |
| 84 | 79 |
| 74 |
187 | 92 |
| 87 | 82 |
| 77 |
196 | 95 |
| 90 | 85 |
| 80 |
205 | 98 |
| 93 | 88 |
| 83 |
214 | 101 |
| 96 | 91 |
| 86 |
223 | 104 |
| 99 | 94 |
| 89 |
233 | 107 |
| 102 | 97 |
| 92 |
243 | 110 |
| 105 | 100 |
| 95 |
253 | 113 |
| 108 | 103 |
| 98 |
264 | 116 |
| 111 | 106 |
| 101 |
274 | 119 |
| 114 | 109 |
| 104 |
285 | 122 |
| 117 | 112 |
| 107 |
297 | 125 |
| 120 | 115 |
| 110 |
309 | 128 |
| 123 | 118 |
| 113 |
321 | 131 |
| 126 | 121 |
| 116 |
331 | 134 |
| 129 | 124 |
| 119 |
346 | 137 |
| 132 | 127 |
| 122 |
359 | 140 |
| 135 | 130 |
| 125 |
HEATING CHECK CHART PROCEDURE
To check system operation during heating cycle, refer to the Heating Check Chart on outdoor unit. This chart indicates whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units. If pressure and temperature do not match on chart, system refrigerant charge may not be correct. Do not use chart to adjust refrigerant charge.
7