Heat Recovery Coil - Carrier 020-093 Installation, Operation And Maintenance Instructions

12 - FACTORY OPTIONS AND ACCESSORIES

12.8 - Heat recovery coil

This option is compatible with B1, B2, BF, BT, BB, R1 and R2
assemblies.
■ The heat recovery coil (HRC) is placed between the main indoor
coil and the air fi lters. The function of the heat recovery coil is
to pre-heat the air that will pass through the main indoor coil.
For this, it uses the temperature of an outdoor water installation.
It is recommended to install an external thermostat that cuts off
the water supply in cases where the water temperature may be
lower than the required value for heating.
■ The coil is supplied with a 3-way valve kit (3WV) for installation
on-site, outside the unit.
Parts of this kit are shipped separate for installation by the
installer: threaded pipe sections, purger, 3-way valve and
actuator, ball valves, gate valve, bracket and clamp. First, it
is advisable to place the bracket of the kit, using 2 of 4.8 self-
tapping hex screws.
Water outlet
Water inlet
It is recommended to insulate all piping located on the
outside of the unit.
■ The unit's electronic control manages both the heat recovery
coil and the 3-way valve.
The cable with the wires for the electrical connection of the
actuator must be connected in BOX8. The installer must feed
the W43 cable through the M16 feedthrough located in the
bottom panel of the 50FF/FC unit, and next, connect it to BOX8.
W43 (BOX8) Actuator
40 COM
→
41 24V
→
42 Y1
→
BOX8 Feedthrough
44
Drainage
Access
panel to
the HRC
Cable Actuator
Note: see the wiring diagram included with the unit for a more
detailed information about the wiring.
■ The inlet/outlet connections of the coil are located on a side
pillar of the unit. The position is shown in the following diagrams.
"Standard" assemblies
B
C
Purger
"In-line" assemblies
3WV
B
C
Bracket
Dimensions (mm)
Standard
In-line
■ Coil fi lling:
- The coil fi lling must be made with the purger open until water
runs through it, which is when it is time to close it.
- Cut off the water supply and let the bubbles generated go up
to the highest coil point and eliminate by opening the purger.
- Pour more water into the circuit and repeat the previous steps.
- Activate the water pump (to be foreseen by the installer) and
repeat the previous steps until no air noises are heard in the
piping, which is when the fi lling of the installation will have
been fi nished successfully.
■ In case of long unit stops, and forcibly if they happen in the
winter season, the coil must be emptied.
■ To prevent the water from freezing, with this option the unit
always has an anti-freezing thermostat. Add glycol to the water
if necessary.
■ The direction of the water fl ow must be correct and so the
following indications must be observed:
Note: the heat recovery coil is not compatible with the hot water
coil, the gas boiler or the gas burner.
1
2
A
1
2
A
Outlet
1
A B
020 to 037 872 721
052 to 062
1099 721
070 to 099
1099 721
052 to 062
534 721
070 to 093 914 721
HEAT RECOVERY COIL HEAT RECOVERY COIL
BATTERIE RÉCUP. CHALEUR BATTERIE RÉCUP. CHALEUR
BATERÍA RECUP. CALOR BATERÍA RECUP. CALOR
V2200010-R V2200011-R
Outlet Inlet
1 2
Inlet
2
C Ø I/O
443 1/2"
443 1/2"
443 3/4"
443 1/2"
443 3/4"