SHC-410-CP (01/13)
Page 6
prevent the intended charge from entering completely, terminate the process of
initial charging. Note and document the amount of refrigerant.
10. When the initial refrigerant charge (see step 9 above) has entered the system,
close the refrigerant container valve and disconnect the refrigerant hose from the
charging port. Note and document the amount of refrigerant.
11. The system has now been initially charged. Disconnect the Digital Micron Gage.
Final Charge
It is critical to control the conditions under which the compressor unit operates while
final charging the system.
Final charging must be done in HEAT mode.
Air Handler Systems
If AIR heating is provided by one of the following DX air handler systems, as
listed in Figure 2, the return air to the air handler during the final charging is to
be maintained in the range of 70°F to 80°F.
If necessary, the air can be warmed
with electric supplemental heat in the air handler. (Shunt “R” to “W2” at the terminal
block.)
Item
Comp
. Unit
Air
Htg.
Hydro
nic
Htg.
Air
Clg
Domesti
c Wtr.
Htg.
System Functions
1.
SC
Yes
Yes
Air heating and cooling
2.
SC
Yes
Yes
Yes
1
Air heating and cooling, domestic hot water by field
installed desuperheater
3.
SD
Yes
Yes
Yes
1
Air heating and cooling, domestic hot water by
desuperheater
1
Includes Desuperheater Model DSH-1872 to supplement water heating.
Figure 2. Systems with DX Air Handlers
Hydronic Systems
If heating is provided through the SCW compressor unit or a hydronic water
module, HWM, as listed in Figure 3, the circulating water in the primary circuit (see
Figures 4 and 5) for the hydronic system is to be maintained in the 95°F to 105°F
range.
Item
Comp.
Unit
Air
Htg.
Hydroni
c Htg.
Air
Clg
Domestic
Wtr. Htg.
System Functions
1.
SC
Yes
2
Yes
2
Radiant panel hydronic heating and air cooling
(chilled water handler)
2.
SC
Yes
2
Yes
2
Yes
1
Radiant panel hydronic heating and air cooling
(chilled water handler); and domestic hot water by
field installed desuperheater
3.
SD
Yes
2
Yes
2
Yes
1
Radiant panel hydronic heating and air cooling
(chilled water handler); and domestic hot water by
desuperheater
4. SCW
Yes
3
Yes
3
Radiant panel hydronic heating and air cooling
(chilled water air handler)
1
Includes Desuperheater Model DSH-1872 to supplement water heating.
2
Hydronic (radiant floor) water heating provided with separately purchased Series HWM Hydronic Water
Module.
3
Has internal refrigerant/water heat exchanger. Requires field supplied water circulating pump.
Figure 3. Systems with Hydronic Heat Exchangers
