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14

SYSTEM PRESSURIZATION — A proper initial cold fill
pressure must be established before the filling of the unit. The
initial cold fill pressure is the pressure applied at the filling
point to fill a system to its highest point, plus a minimum pres-
sure at the top of the system (4 psi minimum) to operate air
vents and positively pressurize the system.

The compression tank (sometimes called expansion tank) is

very important to system pressurization. The compression tank
actually serves several purposes:

1. Provide Net Positive Suction Head Required (NPSHR)

for the pump to operate satisfactorily.

2. Set system pressure.
3. Accommodate expansion/contraction of water due to

temperature changes.

4. Acts as a pressure reference for the pump.

The compression tank pressure must be set BEFORE the

system is filled. The tanks are pre-charged at the factory to
40 psig. If the 30RA unit with expansion tank is the high point
in the system, tank pre-charge pressure of 40 psig will be
adequate. If the 30RA unit with expansion tank is NOT at the
high point in the system, then the minimum pre-charge
pressure for the water system must be determined using Table 3
and the method below:
Tank Pressure = 4 + (height from tank to top of

system in feet/“X”)

For example, assuming a system containing a 20% concen-

tration of ethylene glycol and 50 feet in height from the top of
the system to the expansion tank, the minimum tank pre-
charge pressure would be:

Tank Pressure = 4 + (50 

÷

 2.38) = 25.0 psig 

Table 3 — “X” Factor for Setting Tank Pressure

NOTE: If expansion tanks are placed elsewhere in the system this
method cannot be used since extra pressure drop between the tank
and the pump must be accounted for. 

NOTE: If the system requires a pre-charge greater than
40 psig, increase pressure as described below.
Expansion Tank Pre-Charge — To pre-charge the expansion
tank, do the following steps:

1. Check the tank air pressure at the pre-charge connection

with an accurate pressure gage. Adjust as needed.

2. If additional pressure is required, charge the tank with oil-

free compressed air or nitrogen gas. Occasionally check
the pressure as when filling a tire.

3. Check the air valve for leakage. If it leaks, relieve the

pressure and replace the core with a Schraeder type tire
core. DO NOT depend on the valve cap to seal the leak.

Once the system is pressurized, the pressure at the connec-

tion point of the expansion tank to water piping will not change
unless the water loop volume changes (either due to addition/
subtraction of water or temperature expansion/contraction).
The pressure at this point remains the same regardless of
whether or not the pump is running.

% GLYCOL

ETHYLENE

GLYCOL

PROPYLENE

GLYCOL

0 (pure water)

2.31

2.31

10

2.36

2.33

20

2.38

2.36

30

2.40

2.38

40

2.43

2.38

50

2.47

2.40

Distribution Pump

Expansion
Tank(s)

Air Separator
with Vent

Decoupler

Chiller 1

Chiller 2

Zone 1

Zone 2

Zone 3

x

x

DILUTED

CLEANING

AGENT

SYSTEM

POT FEEDER AND
TRANSFER PUMP

30RA UNIT

TO DRAIN

TEMPORARY
 PUMP

TEMPORARY
BYPASS

x

x

DILUTED

CLEANING

AGENT

SYSTEM

SIDE
STREAM
FILTER

POT FEEDER AND
TRANSFER PUMP

30RA UNIT

TO DRAIN

TEMPORARY
 PUMP

TEMPORARY
BYPASS

NOTE: Expansion tanks in the 30RA hydronic kits must be disconnected for chillers placed parallel in the primary water loop.

Fig. 12 — Typical Air Separator and Expansion Tank Location on Primary-Secondary Systems

Fig. 13 — Typical Set Up for Cleaning Process

Fig. 14 — Cleaning Using a Side Stream Filter

Содержание 30RAN010-055 AquaSnap

Страница 1: ...ture and on tags stickers and labels attached to the equipment Follow all safety codes Wear safety glasses and work gloves Keep quenching cloth and fire extinguisher nearby when brazing Use care in handling rigging and setting bulky equipment See Tables 1A 1D for Physical Data Refer to Fig 2 for unit weights INSTALLATION Step 1 Rig and Place the Unit RIGGING Preferred method is with spreader bars ...

Страница 2: ...48 018 110 146 203 194 653 018 117 161 218 215 711 022 174 237 198 186 795 022 187 268 215 211 881 025 181 241 204 198 824 025 194 272 221 224 911 030 193 268 210 207 878 030 208 308 224 241 981 035 374 320 302 425 1421 035 422 356 341 474 1593 040 381 325 307 440 1453 040 429 361 346 490 1626 045 425 351 368 447 1591 045 473 387 408 496 1764 050 432 356 380 466 1634 050 479 394 421 514 1808 055 4...

Страница 3: ...ti freeze in cooler to prevent freezing of residual water 4 At the beginning of the next cooling season refill cooler and add recommended inhibitor Fig 3 Unit Rigging Label Detail C Copper Finned Condenser Coil UNIT MAX SHIP WT W O PACKAGING MAX SHIP WT W PACKAGING LIFTING HOLES CENTER OF GRAVITY Lb Kg Lb Kg in mm in mm in mm in mm 30RA032 2791 1266 2965 1345 105 44 2678 87 00 2210 43 87 1114 46 0...

Страница 4: ...a sq ft 23 23 23 32 32 40 55 55 64 64 80 HYDRONIC MODULE Optional Pump s Strainer W Blowdown Valve Expansion Tank Pressure Gages Drain and Vent Plugs Flow Switch and Balance Valve Pump Single or Dual Close Coupled Centrifugal Pump s 3500 Rpm Expansion Tank Volume gal 4 4 10 3 UNIT 30RA 010 015 018 022 025 032 035 042 045 REFRIGERANT TYPE R 22 TXV Controlled System Refrigerant Charge lb Ckt A Ckt B...

Страница 5: ... 2 97 2 97 3 72 5 11 5 11 5 95 5 95 7 43 HYDRONIC MODULE Optional Pump s Strainer W Blowdown Valve Expansion Tank Pressure Gages Drain and Vent Plugs Flow Switch and Balance Valve Pump Single or Dual Close Coupled Centrifugal Pump s 58 3 r s Expansion Tank Volume L 16 5 39 UNIT 30RA 010 015 018 022 025 032 035 042 045 REFRIGERANT TYPE R 22 TXV Controlled System Refrigerant Charge kg Ckt A Ckt B 8 ...

Страница 6: ...solid surface side Ends 3 ft 914 mm from solid surface for service access 2 Coil side clearance with accessory hail guard installed is 3 ft 914 mm to outside edge of hail guard top panel 3 Coil side clearance for multiple chiller installation is 6 ft 1981 mm 4 Flow switch is factory installed in leaving fluid piping Strainer is factory installed for entering fluid piping ...

Страница 7: ...lid surface side Ends 3 ft 914 mm from solid surface for service access 2 Coil side clearance with accessory hail guard installed is 3 ft 914 mm to outside edge of hail guard top panel 3 Coil side clearance for multiple chiller installation is 6 ft 1981 mm 4 Flow switch is factory installed in leaving fluid piping Strainer is factory installed for entering fluid piping ...

Страница 8: ...d surface side Ends 3 ft 914 mm from solid surface for service access 2 Coil side clearance with accessory hail guard installed is 3 ft 914 mm to out side edge of hail guard top panel 3 Coil side clearance for multiple chiller installation is 6 ft 1981 mm 4 Flow switch is factory installed in leaving fluid piping Strainer is factory installed for entering fluid piping ...

Страница 9: ...lid surface side Ends 3 ft 914 mm from solid surface for service access 2 Coil side clearance with accessory hail guard installed is 3 ft 914 mm to outside edge of hail guard top panel 3 Coil side clearance for multiple chiller installation is 6 ft 1981 mm 4 Flow switch is factory installed in leaving fluid piping Strainer is factory installed for entering fluid piping ...

Страница 10: ...olid surface side Ends 3 ft 914 mm from solid surface for service access 2 Coil side clearance with accessory hail guard installed is 3 ft 914 mm to outside edge of hail guard top panel 3 Coil side clearance for multiple chiller installation is 6 ft 1981 mm 4 Flow switch is factory installed in leaving fluid piping Strainer is factory installed for entering fluid piping ...

Страница 11: ...id surface side Ends 3 ft 914 mm from solid surface for service access 2 Coil side clearance with accessory hail guard installed is 3 ft 914 mm to outside edge of hail guard top panel 3 Coil side clearance for multiple chiller installation is 6 ft 1981 mm 4 Flow switch is factory installed in leaving fluid piping Strainer is factory installed for entering fluid piping ...

Страница 12: ...should follow sound engineer ing practice as well as applicable local and industry standards Improperly designed or installed systems may cause unsatis factory operation and or system failure Consult a water treat ment specialist or appropriate literature for information regard ing filtration water treatment and control devices Figure 10 shows a typical installation with components that might be i...

Страница 13: ...tall a temporary bypass around the chiller to avoid cir culating dirty water and particulates into the pump pack age and chiller during the flush Use a temporary circulat ing pump during the cleaning process Also be sure that there is capability to fully drain the system after cleaning See Fig 13 2 Be sure to use a cleaning agent that is compatible with all system materials Be especially careful i...

Страница 14: ...a pressure drop between the tank and the pump must be accounted for NOTE If the system requires a pre charge greater than 40 psig increase pressure as described below Expansion Tank Pre Charge To pre charge the expansion tank do the following steps 1 Check the tank air pressure at the pre charge connection with an accurate pressure gage Adjust as needed 2 If additional pressure is required charge ...

Страница 15: ...on of the city water system should be consulted and followed to prevent contamination of the public water supply This is especially important when anti freeze is used in the system Set Water Flow Rate Once the system is cleaned pressur ized and filled the flow rate through the chiller needs to be established On units with the hydronic package this can best be done using the balancing valve In orde...

Страница 16: ...s available from the factory as an accessory These tanks are designed to physically fit beneath the corresponding 30RA unit taking up the same footprint Available volumes are as follows 30RA010 018 110 gallons 30RA022 030 152 gallons 30RA032 055 305 gallons Maximum Loop Volume Since the minimum size of the expansion tank is dependent upon loop volume units with the integrated hydronic kit must not...

Страница 17: ...tion where ambient tempera tures are expected to fall below 32 F Consult local water treat ment specialist on characteristics of the system water and add a recommended inhibitor to the chilled water 1 If the pump will be subjected to freezing temperatures steps must be taken to prevent freeze damage If the pump will not be used during this time it is recommend ed to drain the pump and hydronic pac...

Страница 18: ... Management Module Used for any of the following types of temperature reset demand limit and ice features 4 to 20 mA leaving fluid temperature reset requires field supplied 4 to 20 mA generator 4 to 20 mA cooling set point reset requires field supplied 4 to 20 mA generator Discrete inputs for 2 step demand limit requires field supplied dry contacts 4 to 20 mA demand limit requires field supplied 4...

Страница 19: ...92 2 125 311 3 110 96 2 125 110 97 4 125 110 97 4 125 110 99 6 125 110 208 230 60 187 253 1 102 4 125 316 4 125 106 8 125 125 108 2 125 125 108 2 125 125 110 6 150 125 460 60 414 506 1 50 3 70 160 0 60 52 3 70 80 52 9 70 80 52 9 70 80 54 0 70 80 575 60 518 633 1 41 2 50 140 4 50 42 8 50 50 43 3 50 50 43 3 50 50 44 2 60 50 380 60 342 418 1 65 2 90 202 2 80 67 6 90 80 68 4 90 80 68 5 90 80 69 7 90 8...

Страница 20: ...60 2 1 9 1 3 0 380 60 2 2 9 1 4 6 042 380 415 50 2 2 3 2 2 3 230 50 2 3 8 2 3 8 045 230 60 2 4 8 2 4 8 208 230 60 2 5 3 2 5 3 460 60 2 2 4 2 2 4 575 60 2 1 9 2 1 9 380 60 2 2 9 2 2 9 380 415 50 2 2 3 2 2 3 230 50 2 3 8 2 3 8 050 230 60 2 4 8 2 4 8 208 230 60 2 5 3 2 5 3 460 60 2 2 4 2 2 4 575 60 2 1 9 2 1 9 380 60 2 2 9 2 2 9 055 230 60 2 4 8 2 4 8 208 230 60 2 5 3 2 5 3 460 60 2 2 4 2 2 4 575 60 ...

Страница 21: ...2 205 34 1 225 41 6 310 035 230 60 29 4 265 36 7 265 43 8 380 208 230 60 32 7 265 40 8 265 48 7 380 460 60 14 6 120 20 2 135 23 8 175 575 60 12 2 80 16 6 120 18 9 140 380 60 18 9 155 26 4 170 30 1 235 380 415 50 24 2 175 24 2 175 24 2 175 230 50 41 6 310 41 6 310 41 6 310 040 230 60 36 7 265 36 7 265 43 8 380 208 230 60 40 8 265 40 8 265 48 7 380 460 60 20 2 135 20 2 135 23 8 175 575 60 16 6 120 1...

Страница 22: ...emove the orange harness wire from TB5 1 and wire contacts in series as shown The contacts must be rated for dry circuit application capable of handling a 24 vac load up to 50 mA 5 Terminals 11 and 13 of TB5 are for control of Chilled Water Pump 1 CWP1 starter Terminals 13 and 15 of TB5 are for control of Chilled Water Pump 2 CWP2 starter The maximum load allowed for the chilled water pump relay i...

Страница 23: ...ange harness wire from TB5 1 and wire contacts in series as shown The contacts must be rated for dry cir cuit application capable of handling a 24 vac load up to 50 mA 5 Terminals 11 and 13 of TB5 are for control of Chilled Water Pump 1 CWP1 starter Termi nals 13 and 15 of TB5 are for control of Chilled Water Pump 2 CWP2 starter The maximum load allowed for the chilled water pump relay is 75 va se...

Страница 24: ...ns 6 and 7 for details Do not use compressor to evacuate system REFRIGERANT CHARGE Refer to Tables 1A 1D Immediately ahead of filter drier in each circuit is a factory installed liquid line service valve Each valve has a 1 4 in Schrader connection for charging liquid refrigerant If unit is equipped with a Motormaster V control the pres sure transducer has to be removed from the liquid line Schrade...

Страница 25: ... PUMP UNITS 30RA032 055 PRESSURE DROP SINGLE PUMP UNITS 30RA010 030 PRESSURE DROP SINGLE PUMP UNITS 30RA010 030 LEGEND 1 30RA010 3 30RA018 5 30RA025 7 30RA032 30RA035 9 30RA042 30RA045 11 30RA055 2 30RA015 4 30RA022 6 30RA030 8 30RA040 10 30RA050 Use the following formula to convert Feet of water to psi Ft of water 4335 psi Use the following formula to convert psi to Feet of water Psi 2 306 Ft of ...

Страница 26: ... DUAL PUMP UNITS SIZES 30RA032 055 PRESSURE DROP SINGLE PUMP UNITS 30RA032 055 PRESSURE DROP SINGLE PUMP UNITS 30RA032 055 LEGEND 1 30RA010 3 30RA018 5 30RA025 7 30RA032 30RA035 9 30RA042 30RA045 11 30RA055 2 30RA015 4 30RA022 6 30RA030 8 30RA040 10 30RA050 Use the following formula to convert Feet of water to psi Ft of water 4335 psi Use the following formula to convert psi to Feet of water Psi 2...

Страница 27: ... Accessory Storage Tanks 1 ACCESSORY TANK FLOW RATE gpm PRESSURE DROP ft wg 30RA 900 010 30RA 900 001 009 100 0 10 0 1 0 0 1 10 100 1000 0 1 1 0 10 0 1 0 10 0 ACCESSORY TANK FLOW RATE L s PRESSURE DROP kPa 30RA 900 010 30RA 900 001 009 100 0 ...

Страница 28: ...continue or change at any time specifications or designs without notice and without incurring obligations PC 903 Catalog No 533 00045 Printed in U S A Form 30RA 12SI Pg 28 7 02 Replaces 30RA 1SI Book 2 Tab 5c Copyright 2002 Sterling Sterlco ...

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