McQuay SEASONCON ALP-055C Installation And Maintenance Data

Type
Installation And Maintenance Data
INTRODUCTION
GENERAL DESCRIPTION
McQuay type ALP SEASONCON air cooled condensing units
are designed for outdoor installations and are compatible with
either air handling or chilled water systems. Each unit is
com-
pletely assembled and factory wired before evacuation, charg-
ing and testing, and comes complete and ready for installa-
tion. Each unit consists of twin air cooled condensers with
integral subcooler sections, multiple accessible hermetic
com-
pressors, complete discharge piping and suction connections
for connection to any air or water cooling evaporator.
The electrical control center includes all safety and
operating controls necessary for dependable automatic
operation except for the cooling thermostat since this is
somewhat dependent on the unit application. Condenser fan
motors are fused in all three conductor legs and started by
their own three-pole contactors. Compressors are not fused
but may be protected by optional circuit breakers, or by field
installed fused disconnect.
NOMENCLATURE
A L P
-
080 C
T
CESIGN
;/II’-~‘h*:,.;r
NOMINAL CAPACITY (TONS)
INSPECTION
When the equipment is received, all items should be carefully
be checked before unloading the unit
to
ba sure that it agrees
checked against the bill of lading to insure a complete ship- with the power supply available. Physical damage to unit after
ment. All units should be carefully inspected for damage upon
acceptance is not the responsibility of
McQuay.
arrival. All shipping damage should be reported to the
car-
NOTE: Unit shipping and operating
weights
are available
rier and a claim should be filed. The unit serial plate should
in the physical data tables on pages 10 and
1
1.
INSTALLATION
NOTE: Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes
and regulations, and experienced with this type of equipment. CAUTION: Sharp edges and coil surfaces are a potential
injury hazard. Avoid contact with them.
HANDLING
Care should be taken to avoid rough handling or shock due
to dropping the unit. Do not push or puli the unit from anything
other than the base, and block the pushing vehicle away from
the unit to prevent damage to the sheetmetal cabinet and end
frame (see Figure 1).
Never allow any part of the unit to fall during unloading or
Figure
1.
Suggested Pushing Arrangement
BLOCKING REQ’D.
ACROSS FULL WIDTH
I
i
n
moving as this may result in serious damage.
To lift the unit,
2%”
diameter lifting holes are provided in
the base of the unit. Spreader bars and cables should be ar-
ranged to prevent damage to the condenser coils or unit
cabinet (see Figure 2).
Figure 2. Suggested Lifting Arrangement
IM 269 I Page 3
LOCATION
Care should be taken in the location of the unit to provide
Minimum clearances as shown in Figure 3 will prevent most
proper airflow to the condenser, minimizing effects on
con-
discharge air recirculation to the condenser which will have
densing pressure.
a significant effect on unit performance.
SERVICE ACCESS
Each end of the unit must be accessible after installation for
periodic service work. Compressors, filter-driers, and manual
liquid line shutoff valves are accessible on each side of the
unit adjacent to the control box. High pressure, low pressure,
and motor protector controls are on the compressor. Most
other operational, safety and starting controls are located in
the unit control box.
On all ALP units the condenser fans and motors can be
removed from the top of the unit. A complete fan/motor
assembly should be removed for service.
CAUTION: Disconnect all power to unit while servicing
con-
denser fan motors.
Figure 3. Clearance Requirements
ALP-045C
thru 230C
6 FT. MIN. CLEARANCE
FOR AIR INLET
(1) Minimum clearance between units is 12 feet.
(2) Units must not be Installed in a pit that is deeper than the height of the unit.
(3) Minimum clearance on each side is 12 feet when installed in a pit.
6 FT. MIN. CLEARANCE
FOR AIR INLET
VIBRATION ISOLATORS
Vibration isolators are recommended for all roof mounted in-
stallations or wherever vibration transmission is a considera-
tion. Table 1 lists spring isolators for all ALP unit sizes. Figure
4 shows isolator locations in relation to the unit control center.
Figure 5 gives dimensions that are required to secure each
Table 1. Vibration Isolators (Spring)
Q?txJ
CPl-31 CPl-31
CPl-27 CPl-31 CPl-31
CPl-27
ioU@
CPl-32
CPl-32
CPl-28 CPl-32
CPl-32
CPl-28
OS@
CPl-32 CPl-32
CPl-28 CPl-32 CPl-32
CPl-28
low
CPl-32 CPl-32
CPl-28 CPl-32 CPl-32
CPl-28
?8W:
CP2-28
CP2-26
CP2-28 CP2-26 CP2-28
CP2-28
Z96Q
CP2-31
CP2-31
CP2-31
CP2-31
CP2-31
CP2-31
OgoC
CP2-31 CP2-31
CP2-31 CP2-31 CP2-31 CP2-31
McQuay isolator selection to the mounting surface. Table 3
shows the isolator loads at each location shown in Figure 4,
and the maximum loads for each McQuay selection are
shown in Table 2.
Table 2. Spring-flex Isolators
Gray
W/2
White Stripes
Gray W/Orange Stripe
Gray W/Green Stripe
Gray W/2 Yellow Stripes
477927A-26
600
477927A-27
750
477927A-26
900
477927A-31
1100
Page 4
/
IM 269
REFRIGERANT
PIPING
GENERAL
Piping design, sizing and installation information presented
in ASHRAE Handbooks should, where applicable, be followed
in the design and installation of piping. McQuay type ALP
condensing units are adaptable to either chilled water or air
handling air conditioning applications. The only restriction on
applications is that the evaporator be selected for a system
using refrigerant R-22.
REFRIGERANT PIPING
Piping between the condensing unit and the cooling coil must
be designed and installed to minimize pressure drop, pre-
vent liquid refrigerant carryover to the compressor and to
assure a continuous return of compressor oil from the system.
Piping sketches and tables are not intended to provide infor-
mation on all of the possible arrangements. For example,
when dual circuit evaporators are used with an unloading
compressor, two liquid line solenoid valves may be used to
reduce coil capacity with compressor unloading. Note
especially that dual circuit evaporators should not be piped
with common liquid and suction lines to more than one com-
pressor circuit. Separate evaporators, evaporator circuits and
piping must be run for each compressor circuit.
Piping recommendations include:
1. The use of type K or L clean copper tubing. All ioints should
be thoroughly cleaned and brazed with high temperature
solder.
Piping sizes should be based on temperature/pressure
limitations as recommended in the following paragraphs.
Under no circumstances should pipe size be based upon
the coil or condensing unit piping connection size.
Suction line piping pressure drop should not exceed the
pressure equivalent of
2”
F (3 psi) per 100 feet of equivalent
pipe length. After the suction line size has been deter-
mined, the vertical suction risers should be checked to
verify that oil will be carried up the riser and back to the
compressor. The suction line(s) should be pitched in the
direction of refrigerant flow and adequately supported.
Lines should be free draining and fully insulated between
the evaporator(s) and the compressor. Table 7, page 8,
shows piping information for units operating at suction
temperatures between
40” F and 45” F and a condenser
entering air temperature of 95” F. If operating conditions
are expected to vary substantially from these operating
levels, the pipe sizing should be rechecked.
Vertical suction risers should be checked using Table 5
to determine the minimum tonnage required to carry oil
up suction risers of various sizes.
The liquid line should be sized for a pressure drop not to
exceed the pressure equivalent of
2°F
(6 psi) saturated
temperature. The liquid line(s) on all units must include
a liquid solenoid valve wired into the circuit as shown on
the applicable unit wiring diagrams.
The control circuit for all compressors has been de-
signed to include a
pumpdown
cycle. The use of a liquid
line solenoid is required for proper unit operation. In ad-
dition, a filter-drier should be located between the liquid
line service valve and the solenoid valve and a combina-
tion moisture indicator/sightglass should be located in the
liquid line ahead of the expansion valve.
Suggested piping arrangements are shown on page 7. All
multiple compressor units require a separate refrigerant
circuit for each compressor. The figures shown are for an
air handling installation, but all components shown are
recommended for chilled water vessel installations except
that a refrigerant distributor is not usually required for
shell-
and-tube evaporators.
If dual suction risers are used:
Double risers are sized so that their combined
cross-
sectional internal area will allow full load unit operation
without excessive pressure drop (see notes, Table 7). Riser
“A” is sized to provide adequate suction gas velocity for
proper oil return at minimum load conditions. This riser
becomes effective only when the trap shown in riser
“B”
fills itself with oil. It should be emphasized that the trap
shown in riser “B” should be designed to contain a
minimum internal volume to keep the total system oil re-
quirements at a minimum. Table 7 gives recommended
line sizes for both single and double suction lines and for
liquid lines.
The combined cross-sectional areas of the two risers
must be capable of maintaining adequate refrigerant
velocity for oil return at full unit tonnage.
The extra riser should be of a smaller diameter than
the main riser. The extra riser must include its own trap
at the bottom and should enter the main suction header
at twelve o’clock.
The trap serving the extra riser must be as short as fit-
tings permit. A “U” fitting or the combination of a
90”
standard
"L"
and a 90” street-l is recommended.
The suction line leaving the coil should also include a
trap if the expansion valve control bulb is to be on the
horizontal section leaving the coil outlet. See the pip-
ing sketches on page 7.
Table 5. Minimum tonnage (R-22) to carry oil up
suction riser at 40
o
F saturated suction.
NOTE: When compressor minimum tonnage is less than shown in the above
table for a given line size, double suction risers will be required.
Table 6. Equivalent feet of straight tubing for copper fittings and valves
Page 6 I IM 269
Figure 6. SINGLE CIRCUIT EVAPORATOR
-
RECOMMENDED PIPING
If Row Split Coils Are Used, Duplicate The Piping
CONDENSING UNIT ABOVE THE EVAPORATOR
CONDENSING UNIT BELOW THE EVAPORATOR
Figure 7. DUAL CIRCUIT EVAPORATOR (FACE SPLIT)
-
RECOMMENDED PIPING
_d”
\
_,
D”Ai
RISER
L
-.-
1
~~
iVP4NSlON
Lla.,vt
;:
CONTROL
BULBS
SUCTION
TRAP
L
FXPANSlOlv
VALVE
‘S~FIPIV
TO
LlNt
\.__
_--
SHORT
AS
$1
!
-,m
.R‘iP
-
TONTROL BLLRS
--
i’
“IUD
INSULnrE
FITTINGS
PERMIT
SMORT
*s
STRAP
TO
LlhE
F
TT,rvi,S
PFPMll
4ND
US”L4TE
NOTES:
1.
Piping shown is for one compressor circuit; second circuit is similar. Must have separate piping for each compressor circuit.
2.
Trap for double suction riser should be as small in horizontal direction as fittings will allow.
3.
The thermal expansion valve equalizer line should be placed just past the thermal sensing bulb on the side or top of the pipe.
4. A separate expansion valve is required for each distributor and mounted per manufacturer’s recommendations.
(See additional notes under recommended line sizes, Table 7.)
REFRIGERANT PIPING CONNECTIONS
Refrigerant piping connections will be made at the
com-
unit. When piping, allow room for the unit disconnect and field
pressor end of the unit. Suction and liquid lines should be
wiring to the unit. Figures 8 and 9 show piping connections
routed through the compressor enclosure on each side of the
and sizes for each ALP model.
IM 269
/ Page 7
Table 7. Recommended line sizes
c
1
vi-1
5/a
2%
1%
15.3 23.6
IYe-
% 2%
1
‘/s
18.5
29.1
14.7 29.0
t
17.9 35 3
1%--15/g
a!¶
1
‘/a
t
5/8-2’/8
25/n
%
15/s--2’h 2%
1%
16.6 37.6
15h--2’h
2%
1
YE
16.6 37.6
1%
33.2
48.9
t
%-2’/a
1%-2%
2% 1%
36.1 56.1
t5/8-2’/!¶
I$
2%-25/s 3%
1%
33.0
56.9
2’/8-2%
irr:
.%-25/n
3% 1%
33.4 66.7
2’%-2%
tc
I 2%-25/n
I
3%
t
% 33.9 73.6
2%-25/e
E
f
2%-25/e
I
3%
1%
37.9
82.5
2%-25/s
3%
1
=/n
34.4 90.4 2%-25/a
~,I
,
II
,
.”
._
,
3’/a
1%
C
3%
I
2%
I
35.9
99.6
1
2+-31/s
I
35/s
2%
w
1
Wi-3%
1
3%
1
2%
1
40.0
111.1
1
Wi-3%
1
3% 2%
NOTES:
Recommended line sizes shown in the above table are based on the unit
for oil entrainment should be checked and where necessary double
suc-
operating conditions between 40°F and 45°F saturated suction temperature
tion risers should be utilized. See Table 5.
page
6.
and condenser entering air temperature of 95°F. per 100 ft. equivalent length
of tubing. When design conditions vary, the table values should be rechecked.
1. Liquid and suction lines based on a recommended equivalent pressure
drop of 2°F (3 psi for suction line, 6 psi for liquid line) per 100 ft. of
equivalent length.
4.
5.
2. When refrigerant required to charge a circuit exceeds the
pumpdown
capacity of that circuit the use of a separate refrigerant storage receiver
will be required. The pumpdown capacity (shown in Table 10) is based
on the condenser 90% full at 90°F.
3.
Wherever vertical rise occurs in the suction piping, the minimum tonnage
6.
Table 8. Liquid line accessory kits (when supplied by McQuay)
Wherever vertical rise occurs in the suction piping on a system
with
hot
gas bypass, double suction risers may not be needed as the velocity of
suction gas is increased at minimum load conditions.
Total equivalent feet for a given piping layout must include the equivalent
length of straight pipe for fittings, valves and specialties added to the total
run of straight pipe.
Piping design,
sizing
and installation information presented in
ASHRAE
Handbooks should, where applicable, be followed in the design and In-
stallation of piping.
886-580896A-06
.” ,”
i
886~580896A-09 1%
1
‘/a
886~580896A-10
1
‘/s
1
‘/s
l&2
886-580896A-10
1%
l’/a
l&2
886-580896A-11
1%
1%
I
23oc
182
886~580896A-11
1%
1%
NOTE:
%
Larger capacity expansion valve in liquid line accessory kit is used for
circuit
#2.
,-
,_
._
1
‘/a
1
‘/a
1
Yi
1
‘h
1
‘/a
1%
1
‘h
1
‘/a
1%
1%
1
‘h
1%
t
‘/s
1
‘/a
1%
LIQUID LINE COMPONENTS
McQuay has available a “Liquid Line Accessory Kit” for each
ALP unit size. The kit does not include tubing. Table 8 shows
the ordering number to be used for each ALP unit size. The
components in these kits are:
1. Sealed core filter-driers (ALP-170 thru 230C have
replaceable core filter-driers).
2. Refrigerant solenoid valves.
3. Refrigerant
sightglass/moisture indicators.
4. Expansion valves (one per circuit).
HOLDING CHARGE
The Model ALP condensing unit is shipped with a holding
charge of refrigerant. At the time the unit was received a visual
inspection of the unit piping should have been made to be
sure no breakage had occurred or that fittings might have
been loosened. A pressure check should indicate a positive
pressure in the unit. If no pressure is evident, the unit will
have to be leak tested and the leak repaired. This should be
Page 8
/
IM 269
noted and reported to your McQuay sales representative or
freight carrier if the loss is due to shipping damage.
PRESSURE TESTING
No pressure testing is necessary unless damage was in-
curred during shipment or rigging. Damage may be deter-
mined by a visual inspection of the exterior piping assuming
no breakage has occurred or fittings have loosened. Pressure
gauges should show a positive pressure. If no pressure is
evident on the gauges, a leak has probably occurred releas-
ing all or part of the refrigerant charge. In this case, the unit
should be leak tested to locate the leak.
LEAK TESTING
In the case of loss of the refrigerant holding charge, the unit
should be checked for leaks prior to charging the complete
system. If the full charge was lost, leak testing can be done
by charging the refrigerant into the unit to build the pressure
to approximately 10 psig and adding sufficient dry nitrogen
to bring the pressure to a maximum of 125 psig. The unit
should then be leak tested with a Halide or electronic leak
detector. After making any necessary repair, the system
should be evacuated as described in the following
paragraphs.
CAUTION: Do not use oxygen to build up pressure. A
serious explosion could be the result.
EVACUATION
After it has been determined that the unit is tight and there
are no refrigerant leaks, the system should be evacuated.
The use of a vacuum pump with a pumping capacity of ap-
proximately 3 cu.
ft./min.
and the ability to reduce the vacuum
in the unit to at least
1
millimeter (1000 microns) is recom-
mended.
The first pull down will remove about 90% of the
non-
condensibles, the second about 90% of that remaining
from the first pull down and after the third only 1
/1
0 of 1
o/o
non-condensibles will remain.
Table 12, page 10, shows the relationship between pressure,
microns, atmospheres, and the boiling point of water.
A mercury manometer, electronic or other type of micron
gauge should be connected to the unit at a point remote
from the vacuum pump. For readings below 1 millimeter,
an electronic or other micron gauge should be used.
The triple evacuation method is recommended and is par-
ticularly helpful if the vacuum pump is unable to obtain
the desired
1
millimeter of vacuum. The system is first
evacuated to approximately 29 inches of mercury. Enough
refrigerant vapor is then added to the system to bring the
pressure up to 0 pounds.
Then the system is once again evacuated to 29 inches
of vacuum. This procedure is repeated three times. This
method can be most effective by holding system pressure
at 0 pounds for a minimum of 1 hour between evacuations.
CHARGING THE SYSTEM
Model ALP condensing units are leak tested at the factory
and shipped with a holding charge of refrigerant. In the event
the refrigerant charge has been lost due to shipping damage,
the system should be charged with enough refrigerant to raise
the unit pressure to 30 psig after first repairing the leaks and
evacuating the svstem.
After all refrigerant piping is complete and the system has
been evacuated, it can be charged as described in the
paragraphs following. Connect the refrigerant drum to the
gauge port on the liquid shutoff valve and purge the charg-
ing line between the refrigerant cylinder and the valve.
Then open the valve to the mid-position.
If the system is under a vacuum, stand the refrigerant drum
with the connection up and open the drum and break the
vacuum with refrigerant gas.
With a system gas pressure higher than the equivalent
of a freezing temperature, invert the charging cylinder and
elevate the drum above the condenser. With the drum in
this position, valves open and liquid refrigerant will flow
into the condenser. Approximately 75% of the total require-
ment estimated for the unit can be charged in this manner.
After 75% of the required charge has entered the con-
denser, reconnect the refrigerant drum and charging line
to the suction side of the system. Again purge the con-
necting line, stand the drum with the connection up, and
place the service valve
in
the open position.
IMPORTANT: At this point charging procedure should be
interrupted and prestart checks made before attempting to
complete the refrigerant charge. See startup procedures on
page 48.
NOTE: It is recommended that the total operating charge
per circuit be stamped on the unit nameplate for future
reference.
HOT GAS BYPASS COMPONENTS
McQuay offers a “Hot Gas Bypass Accessory Kit” for each
ALP unit size. Each kit includes a solenoid valve, a hot gas
bypass valve and an instruction drawing. See page 55 for
hot gas bypass operation.
Table 9. Hot gas bypass kits
REFRIGERANT CHARGE
Each ALP condensing unit is designed for use with R-22.
Table 10 lists approximate refrigerant charges for operation
of the unit. Additional refrigerant will be needed for the system
piping and evaporator. Estimated total operating charge
should be calculated before charging system. See Table 11
for weight of refrigerant in copper lines.
CAUTION: Total operating charge per circuit should not
exceed the condenser
pumpdown
capacity per circuit. A li-
quid receiver on each refrigerant circuit could be used in this
situation. Refer to the
ASHRAE
Handbook for the design and
installation of piping and components.
Table 10. Approximate refrigerant charge
NOTE: Condenser
pumpdown
capacity is based on ANWASHAAE Standard
15-1978 rating of 90% full of liquid at 90°F. To convert values to the older
ARI
standard (80% full at 80°F). multiply
pumpdown
capacity by 0 888.
Table 11. Weight of refrigerant R-22 in copper lines
(Pounds Per 100 Feet of Type L Tubing)
is/8
1
1.237
1
88.0
1
4.62
1
1.190 1.770
2’h
2.147 153.0 8.04 2.06 3 060
2%
3.312 236.0 12.4 3.18 4.720
31/a
4.728 336.0 17.7 4.55 6.750
3%
6.398 456 0 24.0 6.15 9.140
4’ia
1
8.313
1
592.0
1
31.1
1
8.00
1
11.190
IM
269 I Page
9
FIELD WIRING
Wiring must comply with all applicable codes and ordinances.
Warranty is voided if wiring is not in accordance with specifi-
cations. An open fuse indicates a short, ground or overload.
Before replacing a fuse or restarting a compressor or fan
motor, the trouble must be found and corrected.
Copper wire is required for all power lead terminations at
the unit while either aluminum or copper can be used for all
other wiring.
ALP units may be ordered with internal power wiring for
either single or multiple point power connection. If single point
power connection is ordered, a single large power terminal
block or non-fused disconnect switch is provided and wiring
within the unit is sized in accordance with the National Elec-
trical Code. A single field supplied disconnect is required.
An optional factory mounted transformer may be provided.
If multiple point wiring is ordered, three power connections,
one per compressor circuit plus one for condenser fans, are
required and wiring with the unit is sized in accordance with
the National Electrical Code. Separate field supplied discon-
nects are required for each of the three circuits. A single
power block is provided for all of the condenser fans and the
optional
115V
control transformer.
CAUTION: Internal power wiring to the compressors for
the single point versus the the multiple point option are dif-
ferent. It is imperative that the proper field wiring be in-
stalled according to the way the unit is built.
Figures
10,
11 and 12 show typical field wiring that is re-
quired for unit installation. Items that require field wiring are
liquid line solenoids (SV1 and
SV2),
optional hot gas bypass
solenoid (SV5) and the cooling thermostat as well as the unit
power supply.
Figure 10. Typical field wiring diagram for ALP-045C
-
08OC
with 4 steps of capacity control
FIELD WIRING TERMINAL
---
FIELD WIRING
-
FACTORY WIRING
-
-
-
OPTIONAL FACTORY WIRING
BK
BLACK WIRING (LINE)
WH
WHlTE
WIRING
(NEUTRALI
Page 14
I
IM 269
Table 18. Capacity reduction
SVl + Comp. 1 + Comp. 3 (R3 energized)
,‘:
SV2 + Comp. 2 + Comp. 4 (R4 energized)
SW
+Comp. 1,
Ul.
U2
SV2 + Comp. 2,
Ul,
U2
SVI
+
Comp. 1
(Ul,
U2
de-energized)
t7lac,
i
SV2
+
Comp. 2
(Ul,
U2 de-energized)
a?$#!&
m
SVl
+
Comp.
1,
Ul,
U2
+ Comp. 3 (R3 energized)
SV2 + Comp. 2,
Ul,
U2
+ Comp. 4 (R4 energized)
SVl
+
Comp. 1 + Comp. 3
(Ul,
U2
de-energized)
Stage 3
Stage 5
Stage 4
Stage 6
Stage
1
Stag-e
1
Stage 2
Stage 2
Stage 3
Stage 3
Stage 4
_I
Stage 4
-
..-_I
Stage 5
-
Stage 5
--
1
1
SV2
+
Comp.
2
+
Comp.4
(Ul,
UZ
Stage
6
Stage
6
de-energized)
1
I
I
NOTES:
1.
Compressor staging for units with suction pressure controlled unloaders and unloaders controlled from a remote source
(discharge
air, return water, etc.) is the same.
2. See page 54 for more information on unloaders controlled from suction pressure.
WATER PIPING FOR CHILLED WATER APPLICATIONS
Due to the variety of piping practices, it is advisable to follow the recommendations of local
authorities. They can supply the installer with the proper building and safety codes required
for a safe and proper installation.
FLOW SWITCH FOR CHILLED WATER APPLICATIONS
A WATER FLOW SWITCH MUST BE MOUNTED in either
the entering or leaving water line to insure that there will be
adequate water flow and cooling load to the evaporator before
the unit can start. This will safeguard against slugging the
compressors on startup. It also serves to shut down the unit
in the event that water flow is interrupted to guard against
evaporator freeze-up.
A flow switch is available from McQuay under ordering
number
860-175033B-00.
It is a “paddle” type switch and
adaptable to any pipe size from 1” to 6” nominal. Certain
Table 19. Flow switch minimum flow rates
Figure 13.
Page 18 /
IM
269
minimum flow rates are required to close the switch and are
listed in Table 18. Installation should be as shown in Figure
13.
Electrical connections in the unit control center should be
made at terminals 5 and 6. The normally open contacts of
the flow switch should be wired between these two terminals.
There is also a set of normally closed contacts on the switch
that could be used
for an indicator light or an alarm to in-
dicate when a “no
flow” condition exists.
EVAPORATOR FAN INTERLOCK FOR AIR HANDLER COIL INSTALLATIONS
It is important to interlock the air handler evaporator fan with
the condensing unit control to insure that there will be a
cool-
purpose. Remove the jumpers between terminals 111 and
11.2 for circuit 1 and 211 and 212 for circuit 2. Use these ter-
ing load on the evaporator before the unit can start to
pre-
minals for the evaporator fan interlock contacts. Be sure to
vent compressor slugging. A pair of terminals for each
refrigerant circuit is available in the unit control center for this
keep circuits separate by using two contacts on dual circuit
machines.
UNIT LAYOUT
&
PRINCIPLES OF OPERATION
Figure 14. Major Component Locations
The figures below illustrate component locations within the unit for each unit size.
COMPRESSOR No. 1
-
COMPRESSOR No. 1
I
I
L---J
COMPRESSOR No. 2
-/
TOP VIEW OF UNIT
COMPRESSOR No. 2
J
\_
COMPRESSOR No. 4
CONTROLCENTER
All electrical controls are enclosed in a weatherproof control
center with keylocked, hinged access doors. The control
center is composed of two separate compartments, line
voltage and control voltage. All of the line voltage
com-
ponents, except for the input terminals of the PVM, are
located in the compartment on the right side of the unit. The
control voltage components are located on the left side with
the live terminals located behind a deadfront panel. This
pro-
tects service personnel from live terminals when accessing
the adjustable and resettable controls.
IM 269 I Page
19
  • Page 1 1
  • Page 2 2
  • Page 3 3
  • Page 4 4
  • Page 5 5
  • Page 6 6
  • Page 7 7
  • Page 8 8
  • Page 9 9
  • Page 10 10
  • Page 11 11
  • Page 12 12
  • Page 13 13
  • Page 14 14
  • Page 15 15
  • Page 16 16
  • Page 17 17
  • Page 18 18
  • Page 19 19
  • Page 20 20
  • Page 21 21
  • Page 22 22
  • Page 23 23
  • Page 24 24
  • Page 25 25
  • Page 26 26
  • Page 27 27
  • Page 28 28
  • Page 29 29
  • Page 30 30
  • Page 31 31
  • Page 32 32
  • Page 33 33
  • Page 34 34
  • Page 35 35
  • Page 36 36
  • Page 37 37
  • Page 38 38
  • Page 39 39
  • Page 40 40
  • Page 41 41
  • Page 42 42
  • Page 43 43
  • Page 44 44
  • Page 45 45
  • Page 46 46
  • Page 47 47
  • Page 48 48
  • Page 49 49
  • Page 50 50
  • Page 51 51
  • Page 52 52
  • Page 53 53
  • Page 54 54
  • Page 55 55
  • Page 56 56
  • Page 57 57
  • Page 58 58
  • Page 59 59

McQuay SEASONCON ALP-055C Installation And Maintenance Data

Type
Installation And Maintenance Data

Ask a question and I''ll find the answer in the document

Finding information in a document is now easier with AI