Carrier 26H - Manual (Page 54)

26H S E R V I C E Carrier
SERVICE ANALYSIS 26H5 AND 26H3
UNIT WILL NOT OPERATE
OBSERVATION POSSIBLE CAUSE REMEDY AND REFERENCE SECTIONS
1. Compressor and water
pump will not start.
Power off Check main sv^itch, fuses and
wiring 22
Low voltage Check building circuit and voltage
at main panel 6 & 20
Loose electrical connec­
tions or faulty wiring Check wiring 20 & 27
Bin thermostat capillary
broken Examine control bulb and replace
if broken
28
Faulty selector switch Repair or replace 22
Off-on safety switch Check for ice in tubes
High pressure switch and
bln control contacts open Check for low ambient temperature,
incorrect setting, faulty switch,
ice on bulb 30 & 31
2. Compressor and water
pump cycle intermittently
This is normal at start up Start and stop machine at 2'
minute intervals several times
Installation
19
Condenser may be plugged
or dirty
High pressure switch has
opened circuit
Clean condenser; high pressure
switch should open at 175 psig
head pressure. Minimum water
pressure 20 psi. Check water
supply.
5,9, & 31
Plugged capillary List evaporator shroud; check
for frosting of evaporator tubing
coil. Replace accumulator
assembly which includes capillaries
7 & 10
3. Compressor Cycles -
water pump runs.
Low voltage , Voltage should be within plus
or minus 10% of nameplate
voltage Installation
13
Minimum low voltages are 104V
for the 115V unit and 207V for the
230V unit
Defective starting relay Check wiring and operation.
Replace if necessary 20 & 25
Overload switch cycles
Compressor Determine cause of overload,
may be dirty condenser. Normal
for 26H3 compressor on start-up 9
Compressor motor shorted Replace compressor 6
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26H-57PD 54