Typical Field Wiring - McQuay seasoncon ALP-067A Installation And Maintenance Data

Figure 9 shows typical field wiring that is required for unit instal-
lation.
Items that require field wiring are:
(SVl & SV2) , optional hot gas bypass solenoid
thermostat as well as the unit power supplies.
FIGURE 9
DISCONNECT
B Y O T H E R S - - \ , , < T E R M I N A L B L O C K
SEPARATE II?,"-IOA
\
POWER FOR CONTROLS
I ','-- DISCONNECT
A NOTE
FUSE-IO A
0 II
8
- F L O W S W I T C H
SYSTEMS)
Thermostat Wiring
Since it is impossible for McQuay to anticipate the type of installa-
tion that an ALP condensing unit may be used on, we do not factory
install a thermostat.
side the unit control center to which a thermostat may be connected.
These terminals are shown and labeled "Terminals For Thermostat" on
the electrical schematics.
On a two circuit unit it is important to connect the thermostat so
that as successive stages of cooling are called for, the compressors
in the unit will be started to alternately increase the condenser
load from refrigerant circuit 1 to circuit 2.
in Table 9.
thermostats for controlling an 8 stage unit and Figure 11 shows typi-
cal field wiring for an 8 stage thermostat.
page 14

TYPICAL FIELD WIRING

UNIT MAIN
_ _ _
_ _ __I'_ - -
BY OTHERS
REFRIGERANT CIRCUIT I
SAFETY AND OPERATING
CONTROLS
REFRIGERANT
SAFETY AND OPERATING
CONTROLS
UNIT CONDENSER
OPERATING
P U M P S T A R T E R
CIRCUIT
6
S Y S T E M S 1
We do, however, provide numbered terminals in-
Figure 10 shows how to install 2 independent four stage
A N D F A N M O T O R S
O P T I O N A L FdSEU
TRANSFORMER
CIRCUIT
2
FANS
CONTROLS
PUMP STARTER
RIO NOTE; CIRCUIT SHOWN ASSUMES CONTINUOUS
6 P U M P OPERATIIN~FOR
PUMP OPERATION CONSULT McOUAY
I I
I I
liquid line solenoids
(SV5) and the cooling
WH I
LEGEND
I
SOL. VALVE
SOL VALVE
3 8 4 S T A R T
RELAYS
PSI.2 -PUMPDOWN
SWITCHES
Rx-EVAP. FAN INTERLOCK
PREVENTS OPENING
SV'S WITHOUT LOAD
RELAYS PROVIDE
RECYCLING PUMP
DOWN DURING OFF
SEASON
POWER SUPPLY
FOR CONTROLS
I N T E R M I T T E N T
This is illustrated