42
Installation and User’s Guide
Problem or Symptoms Possible Cause Corrective Action
Higher than Normal Head Pressure, lower than
normal suction pressure with high superheat
and very cold or frosty distributor tubes,
may
have no Alarm.
TXV stuck closed.
1. Disconnect TXV bulb from suction line (SL), have it in your hand, if
pressures go back to normal, then reinstall the bulb on suction line (it
may have some debris stuck in the port). For adjustable TXVs open
adjustable valve, it may remove the debris and set it back to original
position.
2. If (1) does not work, recover the charge, remove bulb from SL,
unscrew TXV head, shake it, if rattles, replace head
(PN KT-45-ZGA), if not, replace TXV and filter dryer and charge
appropriately.
Lower than Normal Head Pressure, higher
than normal suction pressure with cold suction
line and compressor and no superheat,
may
have no Alarm.
TXV stuck open.
1. Check to see if TXV bulb is firmly attached to suction line, if loose,
attach firmly by tightening the clamp over the bulb and suction line.
2. If (1) above does not work, reclaim charge and replace TXV and
filter dryer with nameplate charge.
Unusually higher than normal current.
TXV stuck closed/partially closed, insufficient water
flow, system overcharged.
See Possible Cause column for: TXV stuck closed, Insufficient
water flow
, and
Unit overcharged
.
Low current with high superheat. Unit undercharged. Find source of refrigerant leak and fix. Pull vacuum and charge.
Unit runs, but trips continously. Wires not connected properly. Fix the miswire as per the Wiring Diagrams.
Problem or Symptoms Possible Cause Corrective Action
Incorrect Wiring.
Check the Light on Phase Monitor inside the electrical box. If red,
switch two of the Input wires. Any two of the three can be switched.
Faulty Phase Monitor.
Call dealer or factory for advice before attempting to replace parts.
Replace Phase Monitor.
Loose wire on Phase Monitor, either from the supply
input power or the output side.
Check the Light on Phase Monitor inside the electrical box. If the Light
is Red, fix the supply power loose end. If the Light is Green, fix the
output loose wire.
Compressor making a loud or unusual noise or
sounds during operation. Fan is turning, no
cool air discharge out of top of heater. Unit
ON, and Set Temperature is above Actual, but
Unit is not heating.
Compressor running Backwards. This usually
happens if the compressor wire harness is
disconnected for possible repaire or replacement.
Switch any two of the three wires on the compressor side of the
Contactor.
Problems and Corrective Action (3 Phase Units Only)
Unable to turn Heat Pump ON. Display is
Blank. Unit will NOT start.
°F OHMS °F OHMS °F OHMS °F OHMS °F OHMS
0 85,387 51 19,377 66 13,136 81 9,076 96 6,382
10 62,479 52 18,870 67 12,809 82 8,861 97 6,238
20 46,225 53 18,377 68 12,491 83 8,651 98 6,097
30 34,561 54 17,899 69 12,182 84 8,447 99 5,960
40 26,100 55 17,435 70 11,882 85 8,249 100 5,827
41 25,391 56 16,985 71 11,589 86 8,056 101 5,697
42 24,704 57 16,548 72 11,305 87 7,867 102 5,570
43 24,037 58 16,123 73 11,029 88 7,684 103 5,446
44 23,391 59 15,711 74 10,761 89 7,506 104 5,326
45 22,764 60 15,310 75 10,500 90 7,333 105 5,208
46 22,156 61 14,921 76 10,246 91 7,164 106 5,094
47 21,566 62 14,543 77 9,999 92 6,999 107 4,982
48 20,993 63 14,176 78 9,758 93 6,839 108 4,873
49 20,438 64 13,820 79 9,525 94 6,683 110 4,664
50 19,900 65 13,473 80 9,297 95 6,530 120 3,758
* Tem
erature Resistance Chart
NOTE: Any service must be done by an authorized service agency person.
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