Vogt HEC-10, Service Manual

Page: 79 / 114

HEC-Series Service Manual
TROUBLESHOOTING
10/21/01
8-4
Symptom: Low ice capacity.
Possible Cause Possible Remedy
Low refrigerant charge in freezer. Add refrigerant and check for leaks.
Restriction in liquid line. Check for obstruction at filter drier (46),
strainer (43), solenoid valve (20) or TXV (17).
The liquid line will normally have frost on the
downstream side of a severe restriction.
Solenoid valve (18) may be leaking warm
refrigerant gas into freezer (2) during the
freezing period. Repair or replace solenoid valve. Check
manual opening stem which should be at “All-
In” position. See Solenoid Valve, FIGURE 9-
13.
Water distributors at top of freezer may be
stopped up. See Water Distributors, Section 7 & 9.
Make-up water float valve (12) provides
inadequate quantity of water for ice making. See Float Valve (make-up water), Section 9.
Check water pressure at machine (30 psig
minimum recommended).
Warm make-up water for ice making. Capacity of machine is proportional to ice
making water temperature. Warmer water will
reduce the ice making capacity. See Ice
Capacity Table, Section 11, TABLE 11-1.
Make-up water float valve (12) stuck open. See Float Valve (make-up water), Section 9.
Water tank drain valve (39) open or leaking. Close valve.
Warm condenser water entering water tank (7)
through overflow connection (40). Pipe water outlet (24) and drain (25) separately
to floor drain. See Water Supply and Drain,
Section 3.
Controls for regulating freezing and thawing
cycles improperly set. See Freezer Pressure Switch and Thawing
Timer, Section 9, FIGURE 9-1, and 9-6.
Excessive head pressure. See Head Pressure, Section 9.
Extended thawing period. Check setting of thawing timer. See Thawing
Timer, Section 9, FIGURE 9-6.
Expansion valve not operating properly. Check setting of expansion valve (17). See
Expansion Valve, Section 9. Also check for
restriction in liquid line at expansion valve,
drier (46) or solenoid valve (20).
Intermittent power interruptions or power
failure. If there is a power failure or a power
interruption, the machine will advance to a
start-up mode when power is restored. After a
two hour period, the machine will restart
automatically if there is no other problem. See
Fault Identity, Section 6, TABLE 6-2.
A machine fault has occurred and the machine
has tried to restart unsuccessfully. Enter the “Troubleshoot” mode and identify the
last occurring fault. See Fault Identity, Section
6, TABLE 6-2.