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 25 shows the volume controller and Fig. 26 shows
the shim removal.
7. Remove short, preformed rubber tube from thermostat.
Replace it with the 2-in. long preformed tube and attach
tube to volume controller. Figure 27 shows the correct
orientation of the tube on the thermostat and Fig. 28 shows
the assembly of the 2 parts.
8. Remove thermostat lever 37AG501302 and replace it
with lever 37AH501182. Snap lever over die-cast stud,
taking care to lock lever slot on the thermostat case hook.
9. Remove the 5
1
⁄
2
-in. long clear plastic tube from ther-
mostat and replace it with the 5
3
⁄
4
-in. long tube.
10. Remove straight-side white foam thermostat gasket and
replace it with larger, curved-side foam gasket. Fig-
ure 29 shows the correct location for the gasket.
S
O
CFM
120
100
80
40
%
Fig. 25 — Setting Maximum Vol-
ume —
37HS Controller
Fig. 26 — Shim Removal
Fig. 27 — Correct Orientation of Connector Tube
P/N HLO8TE101
STYLE NO. 631400
40
80
OPEN
Fig. 28 — Assembly of Thermostat and
Volume Controller
P/N HLO8TE101
STYLE NO. 631400
Fig. 29 — 37HS4 Thermostat
Gasket Location
7
Summary of Contents for 37HS Series
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