37HS1: Because of the limited space on the 23-in. 37HS1
unit, the 37HS1 VAV control has a different method of
assembly.
a. Remove cap from thermostat port of volume control-
ler. See Fig. 32. Pull shim down until released from
thermostat port and then pull shim out from volume
controller body. See Fig. 33. Discard shim.
b. Refer to Fig. 35. Moisten the O-rings of the volume
controller with water and push the controller directly
into the filter extensions.
c. 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. 38. Make sure
that thermostat lever will rotate.
d. Connect the thermostat to the volume controller with
the
3
⁄
16
-in. ID rubber tube with spring.
e. Remove cap from the aspirator supply port on the unit
control block. Connect the aspirator supply tube to the
control block connection.
6. If more than one unit is being controlled by a single vol-
ume controller, attach interconnecting tubing as follows
(refer to Fig 26, page 16):
a. Use
1
⁄
4
-in. OD FR tubing. Connect tubing to the unit
bellows connection on end of the master unit opposite
the control end. Do not connect tubing to capped filter
bellows connection.
b. Using T-tap arrangement, connect the tubing from the
master unit to the 2 slave units on each side of the
master unit.
c. Attach interconnecting tubing from these 2 slave units
in the air series.
Fig. 36 — Correct Orientation of Connector Tube
AIR FILTER
ASPIRATOR
THERMOSTAT
SPRING
CLIP
VOLUME CONTROLLER
Fig. 37 — 37HS2 and 37HS4 Variable
Air Volume Control Installation
RUBBER
TUBE WITH
SPRING
SPRING CLIP
FILTER
EXTENSIONS
Fig. 38 — 37HS1 Variable Air Volume
Control Installation
24
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