Carrier Weathermaster 48P030-100 Controls, Start-Up, Operation, Service, And Troubleshooting page 158

COMPRESSORS
Sizes 030,035
Access to the compressors is below the unit control box.
Sizes 040-060
Access to the compressors is through the doors on the condenser
end of the unit. This door also provides access to the discharge ser-
vice valves, filter driers, the crankcase heaters, and the high-pres-
sure and low-pressure switches. Circuit A is always the compres-
sor on the left when facing main control box.
Sizes 070-100
Each compressor is readily accessible from sides of unit.
LIQUID SERVICE VALVES, SUCTION SERVICE VALVES,
AND SIGHT GLASSES
Sizes 030-060
Access to these components is through the access panel on the
right side of the unit. See Fig. 40. There is also a Schrader port in
each suction line that is accessible through this same panel.
Fig. 40 — Typical Filter Drier and Liquid Service
Valve Access
Sizes 070-100
Access to these components is from the side of the unit.
SUPPLY-FAN MOTORS, PULLEYS, AND BELTS
Access to these components is through the two doors labeled FAN
SECTION on each side of the unit.
POWER EXHAUST MOTORS, PULLEYS, AND BELTS
Access to these components is through the door below the side
economizer hoods on both sides of the unit. See Fig. 41.
Fig. 41 — Modulating Power Exhaust
Motor Access (Both Sides)
RETURN AIR FILTERS
Access to these filters is through the door marked FILTER SEC-
TION.
UNIT CONTROL BOX
Access to this component is through the doors marked ELECTRI-
CAL SECTION on the condenser end of the unit.
GAS HEAT SECTION (48P ONLY)
Access to the gas heat section is through the door labeled HEAT
SECTION on the right side of the unit (when facing return air
end). Figures 42-44 show the gas system components for 2-stage
heat and staged gas heat. Figure 45 shows the components of a
typical modulating gas heat section. For modulating heat units,
Fig. 45 replaces section 2 in Fig. 42-44.
FLUE
OUTLET
GAS VALVE
FLUE
OUTLET
GAS VALVE
NOTE: High heat consists of sections 1 and 2. Low heat consists of section 1 only.
Fig. 42 — Gas Section Detail, Sizes 030-050
LIMIT
SWITCH
NO. 1
FLUE
OUTLET
SECTION 1
GAS VALVE
LIMIT
SWITCH
NO. 2
Fig. 43 — Gas Section Detail, Sizes 055-100
158
LIMIT
SWITCH
NO. 2
SECTION 2
SECTION 1
LIMIT
SWITCH
NO. 1
FLUE
OUTLET
SECTION 2
GAS VALVE
(Low Heat)