Carrier GR-45 - Section 4 Service; 4.1 Maintenance Schedule; 4.2 Opening Top Cover; 4.3 Suction and Discharge Service Valves

T -295
4-1
SECTION 4
SERVICE
WARNING
BE SURE TO OBSERVE WARNINGS LISTED IN THE SAFETY SUMMARY IN THE FRONT OF
THIS MANUAL BEFORE PERFORMING MAINTENANCE ON THE HVAC SYSTEM
NOTE
Following completionofallmaintenanceorservice activities,thealarmqueueshould be clearedofanyorigi-
nal alarms and any alarms generated during service. Refer to paragraph 3.2.1
4.1 MAINTENANCE SCHEDULE
SYSTEM
S
Y
S
T
E
M
REFERENCE
ON OFF
S
Y
S
T
E
M
R
E
F
E
R
E
N
C
E
SECTION
a. Daily Maintenance
X
X
Pre-trip Inspection -- after starting
Check tension and condition of V-belt
2.2
None
b. Weekly Inspection
X
X
X
X
Perform daily inspection
Check condenser, evaporator coils and air filters for cleanliness
Check refrigerant hoses and compressor shaft seal for leaks
Feel filter-drier for excessive temperature drop across drier
See above
None
4.6
4.11
c. Monthly Inspection and Maintenance
X
X
X
X
X
X
Perform weekly inspection and maintenance
Clean evaporator drain pans and hoses
Check wire harnesses for chafing and loose terminals
Check fan m otor bearings
Check compressor mounting bolts for tightness
Check fan motor brushes
See above
None
Replace/Tighten
None
None
None
4.2 OPENING TOP C OVER
To open the top cover, push i n on the latches and pull
forward as the cover is lifted . (See F igure 4-1.)
1
2
PUSH IN ON LATCHES
PULL & LIFT
Figure 4-1. Opening Top Cover
4.3 SUCTION AND DISCHARGE SERVICE V AL VES
The suction and discharge service valves (Figure 4-2)
areprovided with a double seat and a gauge port, which
allowsservicingofthecompressorandrefrigerantlines.
Turning the valve stem counterclockwise (all the way
out) will backseat the valve to open the line to the
compressor and close off the gauge port. In normal
operation, the valve is backseat ed to allow full flow
through the valve. The valve should always be
backseated before removing the gauge port cap.
Turning the valve stem clockwise (all the way forward)
will frontseat the valve to isolate the compressor line
and open the gauge port.
To measure suction or discharge pressure, midseat the
valve by opening the valve clockwise 1/4 to 1/2 turn.
With the valve stem midway between frontseated and
backseated positions, the suction or discharge gauge
port is open to both the compressor and the line.