Figure 9 shows typical field wiring that is required for unit instal-
lation.
Items that require field wiring are:
liquid line solenoids
(SVl
&
SV2),
optional hot gas bypass solenoid
(SV5)
and the cooling
thermostat as well as the unit power supplies.
FIGURE 9
TYPICAL FIELD WIRING
PBl
DISCONNECT
UNIT MAIN
BY OTHERS--\,,< TERMINAL BLOCK
3pH
---_H
___
POWER
___/-:__
CONI,
llNlT
COMPRESSORS
c
AND FAN MOTORS
;BK
SuppLy
_ _
__I’_
-
-
WH
I
\
SEPARATE
II?,“-IOA
LEGEND
POWER FOR CONTROLS
I
‘,‘--
DISCONNECT BY OTHERS
OPTIONAL
FdSEU
i
g_
~~~SLT~OM~~~,~~NNECTION
01
8
A
NOTE
I
TRANSFORMER
FUSE-IO A
0 II
-FLOW SWITCH
(C.W.
SYSTEMS)
irJH_WHlTt
WlhlNG
fNEUT1.
SVl,2-LIOUID
’
INE
SOL. VALVE
REFRIGERANT CIRCUIT I
SAFETY AND OPERATING
SVS-HOT
GAS BY PASS
CONTROLS
SOL VALVE
R3,4-COMP.
384 START
TIME
CLOCK;;-
RELAYS
R5,6,7,E
-SAFETY
RELAYS
PSI.2 -PUMPDOWN
SWITCHES
TDl1,12,13-COMP
SEOUEN-
CING TIME DELAYS
Rx-EVAP. FAN INTERLOCK
PREVENTS OPENING
SV’S WITHOUT LOAD
RELAYS PROVIDE
RECYCLING PUMP
DOWN DURING OFF
SEASON
REFRIGERANT CIRCUIT
2
SAFETY AND OPERATING
CONTROLS
UNIT CONDENSER
FANS
OPERATING CONTROLS
POWER SUPPLY
FOR CONTROLS
’
I
1
I
I
I
PUMP STARTER
PUMP STARTER
CIRCUIT
R9
RIO
NOTE; CIRCUIT SHOWN ASSUMES CONTINUOUS
6
6
T
-C
PUMP
OPERATIIN~FOR
INTERMITTENT
CC.
W.
SYSTEMS1
a0
__:
I I
1
PUMP OPERATION CONSULT
McOUAY
I I
I
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.
We do,
however,
provide numbered terminals in-
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.
This is illustrated
in Table 9.
Figure 10 shows how to install 2 independent four stage
thermostats for controlling an 8 stage unit and Figure 11 shows typi-
cal field wiring for an 8 stage thermostat.
page 14
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