Hi-Velocity RBM-50 Manuale utente

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Module-RBM-Refrigerant-Base-Module-Installation-052020Module-RBM-Refrigerant-Base-Module-Installation-052020

RBM Refrigerant Base Module

Installation Manual

Small Duct High Velocity Heating, Cooling and Home Comfort Systems

RBM-50 (1.5-2 Tons)

RBM-70 (2.5-3 Tons)

RBM-100 (3.5-5 Tons)

Includes:

Pre-Piped TXV

Freeze Stat

Service/Access Ports

T-Mounting Brackets

Double Sided Mounting Tape

Hole Plugs (2)

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Refrigerant Base Modules (RBM)

The RBM Series cooling coil comes as a module and can be

installed in the vertical or horizontal position on the return air

side of the fan coil. The RBM comes with T-mounting brackets,

thermal expansion valve, two access ports, and an external

freeze stat. This module comes heat pump ready and has most

components pre-piped. Only the two access ports and freeze

stat will need to be eld installed. Fig. 01 shows an installed coil

assembly and how each piece is connected.

1) Liquid line

2) High side access port

3) Adjustment stem cap

4) Superheat adjustment stem

5) Thermal expansion valve (TX)

6) Refrigerant distributor

7) Distributor tubes

8) Suction line

9) Anti-ice control (Freeze Stat)

10) Low side access port

11) TX capillary tube

12) TX sensing bulb

RBM modules can be used on any R-410A condenser if R-410A

refrigerant components are used. All Energy Saving Products

R-Series modules come standard with R-410A refrigerant

components.

-3--3-

The RBM module can be installed as a stand (return air base)

for the fan coil or as a side mounted coil. When the desired

air inlet side has been determined, the module can be adapted.

The module comes ready as left to up/right orientation (Fig. 02)

but can easily be changed to a right to up/left orientation. (Fig.

03) See page 3 for steps to adapt the coil to up/left.

The RBM Module can be installed in four dierent

congurations:

A- Entering air in through the left, leaving through the top.

B- Entering air in through the left, leaving through the right.

C - Entering air in through the right, leaving through the top.

D- Entering air in through the right, leaving through the left.

A or B

Fig. 02 - Up/Right Orientation

OR (WITH ADAPTATION)

C or D

Fig. 03 - Up/Left Orientation

Evaporator

Coil

Fig. 01 - Coil Assembly

Coil Conguration

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RBM Refrigerant Base Module Installation

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To change from up/right (standard) conguration to up/left conguration, follow the steps below.

Change Conguration

1) Remove front door

from module. (Fig. 04)

Fig. 04

2) Remove drain pan

by sliding it out from the

bottom. (Fig. 05)

Fig. 05

-4--4-

4) Rotate entire unit 90

deg. clockwise. (Fig. 07)

Fig. 07

6) Replace the drain

pan in (new) bottom

location. (Fig. 09)

Fig. 09

Fig. 06

3) Slide out the air

ow deector plate. (Fig.

06)

Fig. 08

5) Slide the air ow

deector plate back

into the section it was

removed from, in the new

orientation. (Fig. 08)

Fig. 10

7) Remove round

knock-outs on the door

to t drain lines. Plug

previously used drain

holes with provided plugs.

(Fig. 10)

Insert

Plugs

Remove

Knock-Outs

Fig. 11

Return Air

Knock-Out

8) Replace front door

on module. (Fig. 11)

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RBM Refrigerant Base Module Installation

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Mounting the cooling coil to the fan coil can be done with the T brackets supplied

(Fig. 12), ensure that no screws puncture the drain pan or coil. Use the provided double

sided tape to air seal the RBM to the fan coil.See specications page for the dimensions

of the fan coil units and cooling modules.

Once the RBM coil conguration and placement of the return air ducting has been decided, the return air knockout(s) can be cut.

The pre-measured guide cuts supplied with the RBM coil should always be used to make the rst cut. For this rst cut, do not use a saw

blade longer than 5” (125mm) or damage to the coil can occur.

Return Air Cutouts

Mounting Brackets

Fig. 12

TO AVOID DAMAGE: After the rst initial cut using the return air knockout(s) a

metal shear must be used to make the return air cutout opening match more closely

to the lter or return air ducting size to maximize ow capacity. Use this cut method

for both coil inlet and outlet.

Step 1: First cuts (using

pre-measured guide cuts)

can be made with a power

tool (no longer than a 5”

blade)

Step 2: Second cuts (to match

more closely to lter or R/A ducting

size) must be made with a metal

shear to avoid damage to the coil

Pre-Measured

Guide Cuts

-5--5-

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RBM Refrigerant Base Module Installation

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Thermal Expansion Valve & Sensing Bulb

The Thermal Expansion (TX) Valve comes pre-installed inside

the RBM Module. It is acccessible through the easy to remove

front door or access hatch. The access hatch is used to access

the TXV and the adjustment stem after the line sets are brazed

on, and can be adjusted while the system is running. The TXV’s

sensing bulb is pre-installed on a clean, horizontal section of the

suction line. It will be mounted on the top half of the pipe in

the 2 o’clock or 10 o’clock position. (Fig. 13) When brazing near

components always use a wet rag or heat dissipating paste to

avoid damage or overheating any compontents. Failure to do

so may void warranty.

Fig. 13 - TX Sensing Bulb

Access Ports

When refrigerant lines are connected to the RBM coil, high

and low side access ports must be connected as well. (Fig. 01 -

reference 2 & 10) With the use of a tee and reducer this process

is simplied. The access ports are required for system startup and

for future trouble shooting or service. When reading refrigerant

pressures/temperatures, always read them at the evaporator

access ports.

External Equalizer Line

The external equalizer line comes pre-installed o of the

TX Valve’s body and runs to the suction line. It is required to

compensate for refrigerant pressure drop through the coil.

Freeze Stat

The RBM Series cooling module comes with an

anti-freeze control. This freeze control serves the

purpose of preventing severe icing of the coil in the

event of an undercharge or low load on the coil.

During start-up, it is acceptable to jumper across the Freeze-

Stat. This will prevent the freeze-stat from shutting the system

o while charging a new system that may be low on refrigerant.

Once charged and running, this jumper must be removed and the

Freeze-Stat connected to the FZ and FZ terminals on the Printed

Circuit Board. Should wiring needs arise in which the outdoor unit

is controlled through another means of wiring, the Freeze-Stat

should be connected in series on the input side of the control

wiring.

Refrigerant Bypass

All RBM coils come with a pre-installed check valve ready TX

valve, used for AC only or heat pump condensing units. Third

party TX valves may require a bypass check valve.

Fig. 14- Bypass check valve

-6--6-

Freeze-Stat

Sensing

Bulb

10 o’clock 2 o’clock

12 o’clock

END

VIEW

Sensing

Bulb

Sensing

Bulb

Freeze-Stat

Important: Anti-freeze control must be

used at all times. Failure to do so may

void warranty.

Stand/Riser

Capped

Cleanout

P-Trap

Secondary

Drain

Primary

Drain

Fig. 15 - Example of Recommended Condensate Piping

Drain Connections, P - Trap &

Secondary Drain Pan

The primary condensate drain must have a minimum 3”

P-Trap installed (Fig. 15). The drain line must run at a slope of

¼” per foot in the direction of the drain. RBM modules come

with a ¾” male CPVC primary and secondary outlet. It is good

practice to install a clean out right above the P-Trap. Using a

“tee tting” and cap in the P-Trap’s construction can be used as

the clean out and as a way to prime the P-Trap if it ever dries out.

A wet P-Trap is important. A dry P-Trap can be detrimental to

proper drainage. If code requires a secondary drain line, run the

secondary line using the same method as primary. Otherwise,

capping o the secondary drain line is acceptable. Do not run the

secondary drain line to the secondary drain pan or use it as a vent

to atmosphere! An equipment stand/riser or rubber equipment

mat may be necessary to elevate the module o of the ground to

allow for a P-Trap.

Any installation that has the potential of property damage

due to condensate must have a secondary drain pan installed. If

the unit is installed in a high heat and/or high humidity location,

extra insulation around the unit casing may be required. This will

prevent excessive condensate from forming on the outer surface

of the casing.

Important: Piping the condensate lines on a return side cooling

coil can be dramatically dierent, be sure to read info below.

Module RBM

RBM Refrigerant Base Module Installation

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Piping the RBM

Only refrigerant grade pipe and ttings are to be used with

the RBM Module. Plumbing ttings may contain wax or other

contaminants which are detrimental to the proper operation of

the system. Insulate the suction line with a minumum of 3/8”

insulation. In high heat areas, a minimum of 1/2” insulation may

be needed. If the lines are run in an area where temperatures

could exceed 120°F or runs longer than 50’, then the liquid line

may need to be insulated as well. Support the pipe every 5 feet,

or whatever local code states.

Run the pipes in the most direct route possible, taking into

account structural integrity, building details and local building

codes. If the evaporator is located above the condenser, slope

any horizontal runs toward the condenser. If the condenser is

located above the evaporator, a P-trap must be installed at the

bottom of the vertical riser. For long vertical risers, additional

P-traps must be installed for every twenty feet. For lines running

over 50’, a suction line accumulator must be installed. Lines

running over 100’ are not recommended.

Pipe Sizing

Tables 01 and 02 contain line sizing information for the liquid

and suction lines.

The sizes given in the above tables are only for general reference, if the

condenser manufacture requires a di󰀨erent size than specied in Table 01

and Table 02, their sizing shall be used whenever a discrepancy occurs.

Table 01 – Liquid Line sizes

Tons

Distance 1 11⁄22 21⁄23 31⁄24 5

1’–25’ 1⁄41⁄45⁄16 3⁄83⁄83⁄83⁄81⁄2

26’–50’ 5⁄16 5⁄16 3⁄83⁄81⁄21⁄21⁄21⁄2

51’–75’ 3⁄83⁄83⁄81⁄21⁄21⁄21⁄21⁄2

76’–100’ 3⁄83⁄81⁄21⁄21⁄21⁄21⁄21⁄2

Table 02 – Suction Line sizes

Tons

Distance 1 11⁄22 21⁄23 31⁄24 5

1’–25’ 5⁄85⁄83⁄43⁄43⁄47⁄87⁄81

26’–50’ 5⁄83⁄43⁄43⁄47⁄87⁄811⁄811⁄8

51’–75’ 3⁄43⁄47⁄87⁄811⁄811⁄811⁄811⁄8

76’–100’ 3⁄47⁄87⁄811⁄811⁄811⁄811⁄811⁄8

Outdoor Unit Installation

Locate the outdoor unit in a suitable location, as close as

possible to the fan coil. Maintain the clearances recommended

by the manufacturers of the outdoor unit, to ensure proper

airow. The outdoor unit must be installed level, in a properly

supported location. A liquid line lter/drier is recommended to

be installed.

Wiring – Outdoor Unit

Make all connections to the outdoor unit with rain tight

conduit and ttings. Most building codes require a rain tight

disconnect switch at the outdoor unit as well (always check

local codes). Run the proper size copper wires to the unit, and

connect as per the manufacturer’s recommendations.

Ensure that the unit is setup for a TX system. If not, a hard

start kit may be required.

Evacuating

The system must be brazed under a nitrogen purge to

prevent oxidation of the pipe during the brazing process. After

the piping is installed and all components have been brazed

together, a vacuum pump must be used to properly evacuate

the system from both of the access ports to 1500 microns, to

ensure system is free of contaminants. Add refrigerant to the

system to bring the pressure above zero psig. After allowing

the refrigerant to absorb moisture, repeat the above procedure.

Evacuate the system to 500 microns on the second evacuation,

and ensure that the system holds at the vacuum pressure. If not,

check for leaks and evacuate again. If the vacuum holds, add

refrigerant to raise the pressure to 2 psig. At this point open

service valves on pre-charged condensing units.

The use of an electronic leak detector is recommended, as it is

more sensitive to small leaks under the low pressures.

Once the system has been determined clean and ready for

charging, refrigerant can be added. The service valves on the

condenser must be open at this point. Never leave the system

unattended when charging. With the system running, slowly

add refrigerant. The typical operating point of an RBM coil is

that of a saturated suction temperature of 34-40°F at 100-115

psig (1-4°C at 7-8 bar) and a suction line temperature of 38-

44°F at 114-128 psig (3-7°C at 8-9 bar). In order to prevent

overcharging during this stage, refrigerant should be added in

steps. This will allow time for the system to settle and prevent

‘overshooting’ the ideal charge. Condenser pressures and

temperatures remain similar to those in a conventional forced

air system. It is recommended that the coil be charged on a

high load day at the compressor’s highest speed.

Charging

Most system start ups require only an adjustment to the

refrigerant level of the system. Should further renement

be required, the TXV may be adjusted. A clockwise turn of

the superheat adjustment stem (the direction in which the

cap is screwed on) will result in a closing of the valve while a

counterclockwise turn (the direction in which the cap was

unscrewed) will result in opening of the valve. Always note

system conditions before adjusting the valve and allow 5 minutes

for the system to settle before making any further adjustments.

Never adjust the TXV more than one quarter turn at a time.

-7--7-

Important: Failure to follow the proper

evacuating and charging procedures may

void warranty.

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RBM Refrigerant Base Module Installation

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Heat Pumps

Traditionally, SDHV systems have been charged to special

guidelines when used in conjunction with heat pumps. This

charging procedure involved charging the units to normal

cooling capacities and reviewing the operation in heating mode.

If head pressures were found to be impinging on the high head

pressure limits, a small amount of refrigerant was removed to

prevent the unit from shutting down. The cause of high head

pressures in heating mode is due to the disparity in sizes of the

indoor and outdoor coils, along with the lower airow rates of

SDHV systems.

The RBM coil can operate at a level that is dierent from

most other conventional system coils. Typically, superheat levels

are slightly lower at 6-10°F (1 - 3°C) of superheat. Adjustment

of the valve also diers somewhat. Rather than having a large

eect on the range of superheat, adjustment of the valve has

a larger eect on the system pressures; superheat maintaining

a fairly constant point. Opening the valve will increase suction

pressures and decrease liquid pressures, while closing the valve

will decrease suction pressures and raise liquid pressures.

Bi-Flow Receiver

The Bi-Flow Receiver is designed

for use with heat pump systems,

up to 5 tons, and with any typical

refrigerants. The receiver provides

a location for the storage of excess

refrigerant during the heating cycle,

minimizing head pressures. During

cooling mode, the receiver is empty,

allowing the full refrigerant charge to

be utilized for cooling.

The receiver is a horizontal tank with a pair of dip tubes

extending to the bottom of the tank. These two tubes allow for

liquid refrigerant to be drawn from the tank regardless of the

direction of ow. For this reason, the receiver must be mounted

so that the inlet/outlets of the tank come out of the top of the

unit. Mounting brackets are located at the base of the unit for

secure mounting. The receiver is to be located on the liquid line

of the system, anywhere between the indoor and outdoor coils.

As the unit is of a bi-ow design, it does not matter which end

faces towards the indoor coil.

The inlet/outlet ports are constructed of steel and require

the use of a 35-45% Silver Solder and Flux for brazing. The use

of standard copper to copper solders may result in diculty

brazing and the potential for a failure at the weld. Ensure

that the tank is protected from overheating while brazing and

that any remaining ux is cleaned from the unit. If installing

outdoors, ensure that the receiver is insulated and protected

from the elements.

With the introduction of newer, larger heat pumps, this issue

is more likely to be experienced. While some heat pump units

may still be charged in the traditional method, the amount of

refrigerant that is required to be removed for heating mode may

leave the system drastically undercharged for cooling mode. For

this reason it is highly recommended that a Bi-Flow Receiver be

used with heat pump applications.

Charging (Continued)

Typical Operating Ranges

Saturated Suction Temperature 34 - 40°F (1 - 4°C)

Suction Line Temperature 38 - 44°F (3 - 7°C)

Superheat 6 - 10°F (1 - 3°C)

Suction Line Pressure (R-410A) 110-124 psig (7.5-8.5 bar)

Liquid Line Pressure (R-410A) 250-300 psig (17-20.5 bar)

Return Air

When designing the return air for a Hi-Velocity System, there

are a few things to consider. It is common to use centralized

return air with systems that have rooms that are within a

common area. Separate oors or rooms that have high loads

and require a large amount of supply air ow should have their

own return air, or be tied into the centralized return air to allow

the air to return back to the fan coil. Rooms or areas that cannot

be tied into the return air should have an air transfer grill to

allow the air to escape the room and ow back to a centralized

return air.

-8--8-

Important: Return Air must be ltered

before entering the cooling module.

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The Return Air is to be sized on a 0.15 static pressure (37 pa) as

compared to 0.10 static pressure (25 pa) for conventional forced

air systems. The maximum length for an individual return air duct

is fty feet (15.24m).

Duct Sizing

Please note: It is VERY important NOT

to undersize the return air, as this will

create noise, increase motor power

consumption, reduce airow and increase

the possibility of condensate carry-over.

Table 03 has recommended return air sizes for round and

rectangular ducts. A variance of +20% is allowable for sizing

return ducts that connect to the RBM or Hi-Velocity Systems unit.

Where allowed by local codes, a single return air grill may be

used. Note: Return air grill must have equal minimum of free air

area to return air.

Table 03 – Return Air Duct Sizes

Unit Rigid Ø Flex Ø

Min Sq.

Inches

(Sq. cm)

50/51/52 12”

(305mm)

14”

(356mm)

120

(774cm)

70/71 12”

(305mm)

14”

(356mm)

120

(774cm)

100/101 14”

(356mm)

16”

(406mm)

168

(1084cm)

Remember: When using exible duct for return air, use

one duct size larger due to the higher friction loss.

Important: When connecting a round

Return Air to the RBM coil, a round to

rectangular transition is required.

Specications RBM-50 RBM-70 RBM-100

Matching Fan Coil

HE-Z/HE-B/HE-50/51

HV-50/51/52

CU-51

LV-50

HE-Z/HE-B/HE/HV-70/71

LV-70 HE-Z/HE-P/HE-B/HE/HV-100/101

Part Number 41090300050 41090300070 41090300100

Tons(1) 1.5 - 2.0 (5.3 - 7.0 kW) 2.5 - 3.0 (8.8 - 10.6 kW) 3.5 - 5.0 (12.3 - 17.6 kW)

Refrigerant Type R-410A R-410A R-410A

TX Cooling MBH(2) 18-24 (5.3-7.0 kW) 30-36 (8.8-10.6 kW) 42-60 (12.3-17.6 kW)

Latent Cooling MBH 6.8-8.9 (2.0-2.6 kW) 11.7-13.7 (3.4-4.0 kW) 16.0-22.2 (4.7-6.5 kW)

Fin Material Aluminum Aluminum Aluminum

Tubing Material Copper Copper Copper

Type of Fins .006 Al (0.1524mm) .006 Al (0.1524mm) .006 Al (0.1524mm)

Connection

Sizes

Liquid Line (Lq) 3/8”(9.5mm) 3/8”(9.5mm) 3/8”(9.5mm)

Suction Line (S) 7/8”(22.3mm) 7/8”(22.3mm) 7/8”(22.3mm)

Drain Connection 3/4”M CPVC (19mm) 3/4”M CPVC (19mm) 3/4”M CPVC (19mm)

TXV with Built in Check Valve & Bypass Pre-Installed Pre-Installed Pre-Installed

Access Ports Yes Yes Yes

Freeze Stat Yes Yes Yes

Shipping Weight 35 lbs (15.9 kg) 45 lbs (20.4 kg) 55 lbs (24.9 kg)

Module Size (L x W x H) 14 1⁄2” x 18 1⁄4” x 18 1⁄4”

(368mm x 464mm x 464mm)

19 1⁄2” x 18 1⁄4” x 18 1⁄4”

(495mm x 464mm x 464mm)

25 1⁄2” x 18 1⁄4” x 18 1⁄4”

(648mm x 464mm x 464mm)

-9--9-

Important: When using exible duct for

return air, use one duct size larger due to

the higher friction loss.

Module RBM

RBM Refrigerant Base Module Installation

(2) Smaller condensers may be matched to the fan coil when needed (match TXV to condenser size)

(1) Minimum ofMinimum of four HE outletsfour HE outlets per ton of cooling needed. (2” Duct = Minimumper ton of cooling needed. (2” Duct = Minimum eight outletseight outlets per ton)per ton) MBH - Thousand British Thermal Units per Hour

TX - Thermal Expansion

TXV - Thermal Expansion Valve

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Item Length Width Height Liquid Line Suction Line Drain Conn.

Refrigerant Modules B C A D E F

RBM-50 14 1⁄2”(368mm) 18 1⁄4”(464mm) 18 1⁄4”(464mm) 3/8” o.d. 7/8” o.d. 3/4” M CPVC

RBM-70 19 1⁄2”(495mm) 18 1⁄4”(464mm) 18 1⁄4”(464mm) 3/8” o.d. 7/8” o.d. 3/4” M CPVC

RBM-100 25 1⁄2”(648mm) 18 1⁄4”(464mm) 18 1⁄4”(464mm) 3/8” o.d. 7/8” o.d. 3/4” M CPVC

RBM Series Sizing

-10--10-

Module RBM

RBM Refrigerant Base Module Installation

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