26
TK 61555-2-MM-EN
Figure 2. Engine Compartment Components
1.
Compressor Sight Glass
3.
Engine Oil Filter
2.
Engine Oil Dipstick
Unit Protection Devices
C
Co
oo
olla
an
ntt L
Le
ev
ve
ell S
Sw
wiittcch
h:: The coolant level switch closes if the coolant level drops below an
acceptable level. If it stays closed for a specified time, the microprocessor records Alarm Code
37.
E
En
ng
giin
ne
e C
Co
oo
olla
an
ntt T
Te
em
mp
pe
erra
attu
urre
e S
Se
en
nsso
orr:: The microprocessor uses the engine coolant
temperature sensor to monitor the engine coolant temperature. If the engine coolant
temperature rises above an acceptable level, the microprocessor records Alarm Code 41 and
possibly 18. The microprocessor might also shut the unit down.
F
Fu
usse
e L
Liin
nkk ((C
Cu
urrrre
en
ntt L
Liim
miitte
err)):: The fuse link is located in the positive battery cable. The fuse link
protects the electric system from a short. If the fuse link burns out, replace it by replacing the
positive battery cable.
F
Fu
usse
ess:: Various fuses are located on the base controller to protect circuits and components. See
“Fuses” in the Electrical Maintenance Chapter for more information.
S
Sm
ma
arrtt F
FE
ET
Tss:: Smart FETs in the base controller protect circuits and components. See “Smart
FETs” in the Electrical Maintenance Chapter for more information.
H
Hiig
gh
h P
Prre
essssu
urre
e C
Cu
utto
ou
utt S
Sw
wiittcch
h:: The high pressure cutout switch is located on the compressor
discharge manifold. If the compressor discharge pressure becomes excessive, the switch opens
the circuit to the run relay to stop the unit. The microprocessor will record Alarm Code 10.
H
Hiig
gh
h P
Prre
essssu
urre
e R
Re
elliie
eff V
Va
allv
ve
e:: This valve is designed to relieve excessive pressure in the
refrigeration system. It is located on the receiver tank. The valve is a spring-loaded piston that
lifts off its seat when refrigerant pressure exceeds 500 psig (34.47 bar). The valve will reseat
when the pressure drops to 400 psig (27.58 bar). The valve could possibly leak refrigerant after it
has relieved excess pressure. Tapping the valve lightly may help the valve reseat and seal
properly. The valve is non-repairable and requires no adjustment. If the valve fails to reseat
properly, recover the refrigerant charge and replace the valve.
L
Lo
ow
w O
Oiill L
Le
ev
ve
ell S
Sw
wiittcch
h:: The low oil level switch closes if the oil drops below an acceptable level.
If it stays closed for a specified time, the microprocessor shuts the unit down and records Alarm
Code 66.
L
Lo
ow
w O
Oiill P
Prre
essssu
urre
e S
Sw
wiittcch
h:: The low oil pressure switch closes if the oil pressure drops below an
acceptable level. If it stays closed for a specified time, the microprocessor shuts the unit down
and records Alarm Code 19.
P
Prre
eh
he
ea
att B
Bu
uzzzze
err:: The preheat buzzer sounds when the controller energizes the preheat relay. This
warns anyone near the unit that the controller is about to start the engine.
Serial Number Locations
U
Un
niitt:: Nameplate on the frame inside the front doors.
