ULTRATEMP
®
Heat Pump Installation and User’s Guide
31
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 distribu-
tor 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 tighten
ing 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, Insuf-
ficient 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 breaker trips continuously.
Electrical issue.
Contact certified electrician.
40
32
13
3
26
6
29
30
12
31
33
34
28
5
15
14
43
11
44
7
10
35
36
9
8
38
39
24
25
25
25
2
41
42
4
27
37
1
B
DETAIL B – Single Phase
DETAIL B – Three Phase
19
20
21
22
18
16
17
23
SEE
DETAIL B
19
18
17
21
23
22
45
20
REPLACEMENT PARTS
Illustrated Parts View