Carrier 37HS Series, Installation Instructions Manual, Page: 5 / 12

6. Remove cap on thermostat port of volume controller.
Pull shim down until released from port and then pull
shim out from body of volume controller. Discard shim.
Figure 16 shows the volume controller and Fig. 17 shows
the shim removal.
7. Push preformed tube attached to thermostat onto port of
the volume controller. Figure 18 shows the correct ori-
entation of the tube on the thermostat and Fig. 19 shows
the assembly of the 2 parts.
8. Moisten the O-rings of the volume controller with water
and push the controller directly into the filter.
9. Install the thermostat on the center diffuser, then snap
spring clip over thermostat and onto the side diffusers to
hold thermostat in place. See Fig. 20. Make sure that
thermostat lever will rotate.
10. Remove cap from the aspirator supply port on the unit
control block. Connect the clear, 5 1 ⁄
2
in. aspirator sup-
ply tube to the control block connection.
Figure 20 shows the completed installation. The brass tee
is used for slave unit connection where 3 or more units are
used in air series. See Interconnecting Tubing, All Models,
page 8.
S O
CFM
120
100
80
40
%
Fig. 16 — Setting Maximum Volume —
37HS Controller
Fig. 17 — Shim Removal
Fig. 18 — Correct Orientation of
Connector Tube
LE
VE
R
P
/N
3
7
A
G
5
0
0
2
40
80
Fig. 19 — Assembly of Thermostat and
Volume Controller
AIR FILTER
ASPIRATOR
THERMOSTAT
SPRING
CLIP
VOLUME CONTROLLER
Fig. 20 — 37HS1 with 47-in. Diffuser and
37HS2 VAV Control Installation
5