komfovent Duct Heat Exchangers Installation Guide

komfovent Duct Heat Exchangers

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NOMENCLATURE

1. key of heat exchanger name
   DCF – duct freon cooler with rectangular connections
   DCW – duct water cooler with rectangular connections
   DH – duct water heater with round connections
   DHCW – duct water cooler with round connections
   SVK – duct water heater with rectangular connections

2. nominal air flow (m3/h) / 1000

3. cooling capacity at nominal parameters (kW)

4. connection diameter Ø, mm

5. flange dimensions

6. piping row count

TECHNICAL INFORMATION

Duct heat exchangers are mounted outside the unit. Heat exchangers are designed to heat/cool cleaned air in the ventilation systems. Coils are made of copper tubes and aluminium plates as standard. The housings of heat exchangers are made of galvanised steel (fig. 1a)

Coolers with rectangular connections are mounted in shield sections (fig. 1b). Shield thickness is 45 mm, with mineral stone wool (λ = 0,037 W/mK). The case can be painted in RAL 7035.
Cooler section is assembled with a drop separator and a drain tray (drain tray pipe Ø32 mm). The connecting flanges of cooler is L20.
The control of heat exchangers is provided in control automatics.

Air cooler/heater section with rectangular connections is shown in fig. 2.

There are shown water heat exchangers with round connections in fig. 3. Coolers are assembled with drain tray (drain tray pipe Ø15 mm).
Maximum allowable fluid pressure for water heat exchangers – 21 bar. Minimum / maximum fluid tem-perature – -21/130 °C.

Temperature difference between incoming fluid and outcoming air must be at least 3 °C.

Maximum allowable fluid pressure for freon heat exchangers – 42 bar. Minimum / maximum fluid tem-perature – -20/80 °C.
Maximum recommended air flow velocity through heat exchanger – 3 m/s.

Attention Earthing must be installed according EN61557 BS 7671 !
Note : It is a must to mount the drainage siphon.

Table 1. Water and evaporative coolers with rectangular connections

Type| Supply air volume, m³/h| Air temper in/out, ºC| Internal fluid| Capacity, kW| *Air pressure drop, Pa| Hydraulic pressure drop, kPa| B×H×L,**

mm

| Pipe connection| Internal volume, dm3| B1×H1,

mm

| Weight, kg
---|---|---|---|---|---|---|---|---|---|---|---
DCF-0,4-3| ****

400

| ****

30/18

| R410A| 2,8| 16| 0,4| 600×550×390| ½“ /22 mm| 0,9| ****

300×400

| 40
DCW-0,4-3| Water 7/12| 2,6| 30| 30,7| 505×550×390| ½“| 1,6| 33
DCF-0,5-3| ****

500

| R410A| 3,5| 19| 0,6| 600×550×390| ½“ /22 mm| 0,9| ****

400×300

| 40
DCW-0,5-3| Water 7/12| 3,3| 30| 52,8| 600×550×390| ½“| 1,9| 35
DCF-0,7-5| ****

700

| R410A| 4,8| 22| 0,6| 705×610×390| ½“ /22 mm| 1,8| ****

500×400

| 49
DCW-0,7-5| Water 7/12| 4,2| 22| 6,9| 705×610×390| ½“| 2,6| 42
DCF-0,9-6| ****

900

| R410A| 6,2| 29| 0,9| 705×610×390| ½“ /22 mm| 1,8| ****

500×400

| 49
DCW-0,9-6| Water 7/12| 5,5| 30| 7,9| 705×610×390| ¾“| 2,8| 45
DCF-1,2-8| ****

1200

| R410A| 8,3| 43| 1,5| 705×610×390| ½“ /22 mm| 1,8| ****

500×400

| 49
DCW-1,2-8| Water 7/12| 7,4| 46| 12,8| 705×610×390| ¾“| 2,8| 45
DCF-1,4-10| ****

1400

| R410A| 9,7| 74| 11,8| 705×610×390| ½“ /22 mm| 2,3| ****

500×400

| 51
DCW-1,4-9| Water 7/12| 8,7| 61| 16,7| 705×610×390| ¾“| 2,8| 45
DCF-1,6-11| ****

1600

| R410A| 11,1| 78| 16,4| 755×610×420| ½“ /22 mm| 2,5| ****

500×400

| 56
DCW-1,6-11| Water 7/12| 10| 65| 22,2| 755×610×420| ¾“| 3,0| 46
DCF-2,0-14| ****

2000

| R410A| 13,8| 71| 30,7| 920×610×420| 5/8 “ /22 mm| 3,1| ****

700×400

| 65
DCW-2,0-13| Water 7/12| 12,8| 60| 38| 920×610×420| ¾“| 3,6| 57
DCF-2,5-17| ****

2500

| R410A| 16,9| 67| 14,9| 1080×670×420| 5/8“ /22 mm| 7,5| ****

800×400

| 79
DCW-2,5-17| Water 7/12| 15,5| 63| 16,6| 1080×670×420| 1“| 8,4| 65
DCF-3,0-20| ****

3000

| R410A| 20,8| 92| 22,1| 1080×670×420| 5/8“ /22 mm| 7,6| ****

800×400

| 79
DCW-3,0-20| Water 7/12| 18,7| 102| 23| 1080×670×420| 1“| 8,4| 69
DCF-4,0-27| ****

4000

| R410A| 26,9| 94| 45,6| 1220×730×420| 5/8“ /22 mm| 9,8| ****

900×500

| 97
DCW-4,0-27| Water 7/12| 25,2| 106| 38,4| 1220×730×420| 1“| 10,7| 82
DCF-4,5-31| ****

4500

| R410A| 30,3| 95| 35,5| 1220×790×420| ¾“ /22 mm| 10,9| ****

900×600

| 103
DCW-4,5-30| Water 7/12| 28,8| 108| 62| 1220×790×420| 1“| 11,9| 87
DCF-7,0-48-2| ****

7000

| R410A| 2×24,2| 102| 10,2| 1500×790×480| 2×¾“/2×22mm| 7,7| ****

1200×600

| 125
DCW-7,0-47| Water 7/12| 44,5| 100| 35,5| 1500×790×420| 1 ½“| 10,4| 105

Table 2. Evaporative coolers with rectangular connections adapted to external condensers MOU

Type| Supply air volume, m³/h| Air tem- per. in/out,

ºC

| Internal fluid| Capacity, kW| *Air pressure drop, Pa| Hydraulic pressure drop, kPa| B×H×L, mm| Pipe connection| Internal volume, dm3| B1×H1, mm| Weight, kg
---|---|---|---|---|---|---|---|---|---|---|---
DCF-0,4-3| 400| 30/18,5| **

R410A

| 2,6| 16| 0,4| 600×550×390| ½“ /22 mm| 0,9| 300×400| 40
DCF-0,5-3| 500| 30/18,7| 3,2| 20| 0,5| 600×550×390| ½“ /22 mm| 0,9| 400×300| 40
DCF-0,7-5| 700| 30/16,8| 5,3| 22| 0,7| 705×610×390| ½“ /22 mm| 1,8| 500×400| 49
DCF-0,9-6| 900| 30/16,0| 7,4| 30| 1,2| 705×610×390| ½“ /22 mm| 1,8| 500×400| 49
DCF-1,2-8| 1200| 30/17,2| 8,9| 45| 1,7| 705×610×390| ½“ /22 mm| 1,8| 500×400| 49
DCF-1,4-10| 1400| 30/16,8| 10,7| 74| 14,3| 705×610×390| ½“ /22 mm| 2,3| 500×400| 51
DCF-1,6-11| 1600| 30/18,4| 10,7| 79| 15,3| 755×610×420| ½“ /22 mm| 2,5| 500×400| 56
DCF-2,0-14| 2000| 30/17,7| 14,2| 71| 32,3| 920×610×420| 5/8“ /22 mm| 3,1| 700×400| 65
DCF-2,5-17| 2500| 30/18,7| 15,8| 67| 13,2| 1080×670×420| 5/8“ /22 mm| 7,5| 800×400| 79
DCF-3,0-20-2| 3000| 30/17,7| 2×10,6| 79| 12,6| 1080×670×420| 2×½“ /2×22mm| 4,5| 800×400| 79
DCF-4,0-27-2| 4000| 30/17,7| 2×14,2| 80| 24,6| 1220×730×420| 2×5/8“ /2×22mm| 5,7| 900×500| 92
DCF-4,5-31-2| 4500| 30/17,6| 2×16,1| 82| 39,1| 1220×790×420| 2×5/8“ /2×22mm| 6,3| 900×600| 98
DCF-7,0-48-3| 7000| 30/17,9| 3×16,2| 100| 13,2| 1500×790×480| 3×5/8“ /3×22mm| 8,0| 1200×600| 131

with droplet eliminator

Table 3. Duct water heat exchangers with round connections

Type| Supply air volume, m³/h| Air temper. in/out, ºC| Fluid| Capacity, kW| Air pressure drop, Pa| Hydrau- lic pressure drop, kPa| ****

B×H×L, mm

| Pipe connection| Internal volume, dm3| ØD, mm| Weight, kg
---|---|---|---|---|---|---|---|---|---|---|---
DH-125| ****

450

| 10/22| Water 60/40| 1,8| 44| 2,2| 335×295×152| ****

½“

| 0,9| ****

125

| 6,15
DHCW-125| 26/18| Water 7/12| 1,4| 69| 11,6| 335×335×164| 1,2| 11,13
DH-160| ****

450

| 10/22| Water 60/40| 1,8| 44| 2,2| 335×295×152| 0,9| ****

160

| 6,15
DHCW-160| 26/18| Water 7/12| 1,4| 69| 11,6| 335×335×164| 1,2| 11,13
DH-200| ****

900

| 10/22| Water 60/40| 3,6| 101| 4,5| 360×320×152| 1,1| ****

200

| 7,04
DHCW-200| 26/18| Water 7/12| 3,0| 153| 50,1| 365×365×164| 1,5| 12,40
DH-250| ****

900

| 10/22| Water 60/40| 3,6| 49| 5,4| 420×380×152| 1,5| ****

250

| 9,30
DHCW-250| 26/18| Water 7/12| 3,1| 77| 67,6| 425×425×164| 2,0| 15,37
DH-315| ****

1600

| 10/22| Water 60/40| 6,5| 58| 17,9| 470×510×152| 2,1| ****

315

| 11,75
DHCW-315| 26/18| Water 7/12| 5,2| 90| 13,4| 560×515×164| 3,0| 21,60
DH-315M| ****

2000

| 10/22| Water 60/40| 8,1| 98| 3,6| 480×520×132| 2,4| ****

315

| 14,39
DHCW-315| 26/18| Water 7/12| 6,5| 133| 20,1| 560×515×164| 3,0| 21,60
DH-355| ****

2000

| 10/22| Water 60/40| 8,1| 61| 28,3| 600×510×152| 2,4| ****

355

| 13,34
DHCW-355| 26/18| Water 7/12| 6,6| 55| 21,6| 605×605×164| 2,4| 25,43

Table 4. Duct water heat exchangers with rectangular connections

Type| Supply air volume, m³/h| Air temp. in/out, °C| *Capacity, kW| Air pressure drop, Pa| Hydraulic pressure drop, Pa| B×H×L, mm| Pipe connection| Internal volume, dm3| B1×H1, mm| Weight, kg**
---|---|---|---|---|---|---|---|---|---|---
SVK-400×200-2| 850| 0/22| 6,3| 37| 31| 480×320×100| ½”| 0,8| 400×200| 5,0
SVK-400×200-4| 850| -23/22| 12,8| 69| 33| 517×320×130| ½”| 1,3| 400×200| 7,0
SVK-500×250-2| 1500| 0/22| 11,1| 70| 14| 617×320×100| ½”| 0,9| 500×250| 6,0
SVK-500×250-4| 1500| -23/22| 22,6| 131| 17| 617×320×130| ½”| 1,5| 500×250| 9,0
SVK-500×300-2| 1800| 0/22| 13,3| 65| 24| 617×380×100| ½”| 1,1| 500×300| 7,0
SVK-500×300-4| 1800| -23/22| 27,2| 122| 26| 623×380×130| ¾”| 2,1| 500×300| 12,0
SVK-600×300-2| 2300| 0/22| 17| 73| 40| 717×380×100| ½”| 1,2| 600×300| 8,0
SVK-600×300-4| 2300| -23/22| 34,7| 137| 25| 723×380×130| ¾”| 2,3| 600×300| 13,0
SVK-600×350-2| 2600| 0/22| 19,2| 65| 21| 717×440×100| ½”| 1,5| 600×350| 9,0
SVK-600×350-4| 2600| -23/22| 39,2| 123| 25| 723×440×130| ¾”| 2,8| 600×350| 15,0
SVK-700×400-2| 4000| 0/22| 29,6| 120| 52| 817×500×100| ½”| 3,1| 700×400| 12,0
SVK-700×400-4| 4000| -23/22| 60,3| 226| 53| 830×500×130| 1”| 6,4| 700×400| 18,0
SVK-800×500-2| 4500| 0/22| 33,3| 92| 14| 923×560×100| ¾”| 4,1| 800×500| 14,0
SVK-800×500-4| 4500| -23/22| 67,9| 172| 14,2| 937×560×130| 1 ¼”| 8,5| 800×500| 21,0
SVK-1000×500-2| 5700| 0/22| 42,1| 94| 22| 1123×560×100| ¾”| 4,9| 1000×500| 16,0
SVK-1000×500-4| 5700| -23/22| 86| 177| 23| 1137×560×130| 1 ¼”| 10,1| 1000×500| 25,0

Intenal fluid temperature 80/60 ºC.

There are shown technical data of heat exchangers: capacity, air pressure drop, hydraulic pressure drop at different air flows and parameters (cooling capacities are calculated at 50 % relative humidity) in tables 1–4.
Weights, dimensions and dimensions of the connections of heat exchangers are also specified.

INSTALLATION OF HEAT EXCHANGERS

Unit is for indoor use only at temperature between +5 and +40°C. Coolers must be installed in position that air flow direction would be horizontal.
In heat exchangers the water flow direction through the heat exchanger must always be opposite to the air flow direction.

DH and DHCW heat exchangers are equipted with return water temperature sensor. It is mounted depending on fluid flow direction fig. 4b.

Heat exchangers should be carefully flushed out with water before the installation. DCF heat exchangers is filled with nitrogen gas which must be released through the valve.

Attention! When screwing fitting pipes on to the system, hold them with a tube wrench, as in Fig. 5a.

Attention!
Fig. 5a shows correct heat exchanger fitting pipe connection. Wherever possible, heat exchanger pipes should be connected in such a way as to ensure free access to pipe work for maintenance. When carrying out installation of heat exchanger pipes, make sure that liquid (evaporative refrigerant) supply is completely disconnected.

In fig. 5b shown sensor must be thermaly insulated. Sensor is connected to the controller terminals (see automatic control manual).

Before start-up of the air handling unit, working evaporative refrigerant should be injected into the heat exchangers. The heat exchanger can be fill up with water and 30 percent with ethylene glycol liquid.
The technical documentation of ethylene glycol liquid, make inquiries to producers.

Never pour glycol down a drain; collect it in a receptacle and leave it at a recycling centre or the like. Glycol is highly dangerous to consume and can cause fatal poisoning or damage the kidneys. Contact a doctor! Avoid breathing glycol vapour in confined spaces. If you get glycol in your eyes, fush them thoroughly with water (for about 5 minutes).

CLEANING AND INSPECTION OF HEAT EXCHANGERS

The plates of heat exchangers and droplet eliminators should be cleaned regulary to ensure the most effective heat exchange between the surface of coil and the air flow passing through it.
Cleaning frequency should be set depending on air purity and in-line filters.
Always clean the heat exchanger against the regular direction of airfow. Make sure that the coils are purged of air. If a droplet eliminator is fitted, remove it and fush it clean with water. Also check that the condensate drain is not clogged.

WATER TRAP INSTALLATION
The bend of the water trap can be repositioned by turning it to the right or the left. The drain line from the water trap must be arranged so that it will not damage adjacent unit sections or building elements. If the drain line is run through cold spaces, it should be insulated to prevent freezing. A heating cable may be required.

Water trap installation for a unit section mounted on the suction side
Since the fans in most air handling units are last in the chain of functions and generate sub-atmospheric pressure inside the unit,it is very important to correctly install the water trap. Because of that reason condensate can be hardly eliminated from the air handling unit and the technical premise may get covered with condensate. Height H1 must be at least equivalent in mm to half of the negative pressure inside the unit in mm water gauge. Height H2 must be at least equivalent in mm to the negative pressure inside the unit in mm water gauge.

There is shown the principle scheme of correct drainage siphon installation in fig. 6.

Precaution
The drainage siphon should be mounted on the outlet fitting pipe of every drip tray for complete condensate drainage from the air handling unit and prevention of penetration of offensive odours from an effluent into the ventilation system.

Water trap installation for a unit section mounted on the pressure side

Since the fans in most air handling units are not last in the chain of functions and generate over-atmos-pheric pressure inside the cooling section. In such case the consisted condensate can be easily removed from AHU and there will be no strict requirements for siphon‘s installation. A drainage siphon is enough with a minimum rake.
RECOMMENDATION : The drainage siphon must be installed in connection with not less size pipe diameter.

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