Start-Up of Coil Module, Steam Coils

Start-Up of Coil Module

Hot Water and Chilled Water

1. Piping should be in accordance with accepted

industry standards. Pipework should be supported

independently of the coils. Water pipes are copper

with sweat connections. USE WET TOWEL TO

AVOID BURNING COIL CONNECTION GROMMETS.

When installing coupling, do not apply undue

stress to the connection extending through the

unit. Use a back-up pipe wrench to avoid breaking

the weld between coil connection and header.

2. Connect the water supply to the bottom

connection on the air-leaving side and the water

return to the top connection on the air-entering

side. The extra bottom connection can be used for

an auxiliary manual drain connection, and the extra

top connection may be used for an automatic air

vent, or the extra connections can be capped. To

3.When connecting suction and liquid connections, make sure the coil is free from all foreign material. Make sure all joints are tight and free of leakage.

4.Greenheck does not supply compressor or condensing units, for further instruction on DX coil installation and operation contact your compressor and/or condenser manufacturer.

DXI coils have dual connections and should be used with two compressors.

WARNING

Standard unit insulation of 1.5 lbs. density has an insulation R-value of 3.7.

For applications where the unit discharge temperatures are below 55°F and the unit is installed in a warm, humid environment, additional insulation may need to be applied to the exterior of the unit to prevent condensation.

ensure proper venting, an external air vent in the

piping is recommended. Connecting the supply

and/or return in any other manner will result in very

poor performance. CAP UNUSED CONNECTIONS.

3. The air vent at the uppermost point should be

temporarily opened during system start-up to

release all of the air from the coil. To maintain heat

transfer capacity, periodically vent any air in coil.

Vent to be located behind connections side access

door.

4. Water coils are not normally recommended for

use with entering air temperatures below 40°F.

No control system can be depended on to be

100% safe against freeze-up with water coils.

Glycol solutions or brines are the only safe media

for operation of water coils with low entering air

conditions.

Steam Coils

Application Recommendations

Satisfactory operation and
service life are best
ensured when coils
are installed with
proper piping,
trap and support
arrangement.
The following
notes and
drawing are
recommended
for the coil unit
installation and		Main
operation.	Return	Main

Main

Steam

WARNING

Continuous water circulation through the coil at all times is highly recommended.

5.Pipe sizes for the system must be selected on the basis of the head (pressure) available from the circulation pump. Piping should be in accordance with accepted industry standards.

6.For chilled water coils, the condensate drain pipe should be sized adequately to ensure the condensate drains properly. See Drain Pan Traps section and related drawing.

Direct Expansion (DX) Coils

1.Piping should be in accordance with accepted industry standards. Pipework should be supported independently of the coils. Undue stress should not be applied at the connection to coil headers.

2.The condensate drain pipe should be sized adequately to ensure the condensate drains properly. See Drain Pan Traps and related drawing.

General	Strainer
1. Provide	Gate Valve	Float & Thermostat Trap
1. Provide		Float & Thermostat Trap
separate		Check Valve
separate	Control Valve	Check Valve
supports and	Modulating Two-Position	Vacuum Breaker
supports and

	hangers for the	Steam Coil Piping
	unit and the piping.	Steam Coil Piping
	unit and the piping.

2.Be certain that adequate piping flexibility is provided. Stresses resulting from expansion of closely coupled piping and coil arrangement can cause serious damage.

3.Standard steam coils are pitched in the casings when installed for horizontal airflow. The casing must be level after the unit is installed for proper condensate drainage. If condensate is not removed, the coil will suffer from water hammering and will have a shortened life. On vertical airflow applications, the coils must be pitched when installed.

4.Do not reduce pipe size at the coil return connection. Carry return connection size through the dirt pocket, making the reduction at the branch leading to the trap.

12 Model MSCF Modular Small Cabinet Fan