Carrier 37HS Series, Installation Instructions Manual, Page: 3 / 12

6. Moisten the 2 O-rings with water, then push the filter
into the unit control block and onto bellows connection
until the standoffs rest on the unit end plate. See Fig. 7.
7. 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 8 shows the volume controller and Fig. 9 shows
the shim removal.
8. Install the 5 3 ⁄
8
-in. tube, with spring inserted, to the ther-
mostat port of the volume controller.
9. Moisten the O-rings of the volume controller with water
and push the controller directly into the filter elbow con-
nections. See Fig. 10.
10. Install the thermostat on the center diffuser, then snap
spring clip over thermostat and onto the side diffusers to
hold thermostat in place. Make sure that thermostat le-
ver will rotate.
11. Connect the thermostat to the volume controller with the
rubber tube with spring.
12. Remove cap from the aspirator supply port on the unit
control block. Remove 5 1 ⁄
2
-in. plastic tube attached to
the aspirator and replace it with 4 3 ⁄
8
-in. length. Connect
the aspirator supply tube to the control block connec-
tion. Figure 11 shows the completed installation.
The brass tee is used for slave unit connection where
3 or more units are used in air series. See Interconnect-
ing Tubing, All Models, page 8.
HIGH-PRESSURE
PORT
Fig. 7 — Control Filter Installed
S O
CFM
120
100
80
40
%
Fig. 8 — Setting Maximum Volume —
37HS Controller
Fig. 9 — Shim Removal
120
100
80
40
CFM
%
HK08ZZ030
Fig. 10 — Volume Controller Connected
to Filter
RUBBER
TUBE WITH
SPRING
SPRING CLIP
FILTER
EXTENSIONS
Fig. 11 — 37HS Variable Air Volume
Control Installation
3