Table 3 — Control Identification (cont)
ELECTRIC INTERLOCK PNEUMATIC WALL THERMOSTAT
Used On Package No. Used On Package No.
37HS1 37CM900922 37HS1 37HS900007 (DA)
37HS2 37CM900922 37HS2 OR
37HS4 37CM900922 37HS4 37HS900008 (RA)
PNEUMATIC PILOT VALVE
FOR HEATING/COOLING SEQUENCE
PNEUMATIC WARM-UP/FIRE SWITCH
Used On Package No. Used On Package No.
37HS1 37CM900972 (NO) 37HS1 37HS900017
37HS2 OR 37HS2 37HS900017
37HS4 37CM900982 (NC) 37HS4 37HS900017
DA — Direct Acting
NC — Normally Closed
NO — Normally Open
RA — Reverse Acting
AIRFLOW ADJUSTMENT — Each 37HS volume control-
ler is equipped with a maximum cfm lever for setting the
required unit airflow in the field. The lever is located at the
bottom of the controller. See Fig. 39. The controller has a
star wheel located at the top of the controller for setting the
minimum airflow. The star wheel is also shown in Fig. 39.
Maximum Airflow (Cfm) Adjustment — The 37HS maxi-
mum airflow adjustment lever is common to all sizes and is
divided into levels of percent cfm. Table 4 shows the
approximate unit airflow that will be obtained by each lever
setting for each unit size.
Table 4 — Maximum Airflow Settings
LEVER SETTING
(% CFM)
UNIT AIRFLOW (CFM)
37HS1 37HS2 37HS4
120 120 240 480
100 100 200 400
80 80 160 320
40 40 80 160
The maximum cfm is the unit airflow obtained when the ther-
mostat is calling for full cooling in a VAV system; it is the
design cfm for the space conditioned by the unit or units
regulated by one controller.
The variation in maximum airflow for a given setting of
the lever is a function of the unit plenum size, the model and
the number of units in an air series on one controller. See
Tables 5 and 6.
Table 5 — Maximum Cfm Through the
Inlet Collar of a Single Unit or of Units in
Air Series
MODEL
PLENUM
SIZE
(in.)
INLET
COLLAR
DIAM
(in.)
MAXIMUM TOTAL
AIRFLOW
(Cfm)
37HS1
5x7 4 110
7x7 6 400
9x9 8 800
11x11 10 1100
37HS2
7x7 6 400
9x9 8 800
11x11 10 1100
37HS4
9x9 8 800
11x11 10 1100
13 x 13 12 1600
Table 6 — Maximum Number of Units in an
Air Series on One Control
MODEL
PLENUM SIZE (in.)
ALL UNITS
IN AIR SERIES
NUMBER OF UNITS
ON ONE CONTROL
2345
37HS1
5x7* ————
7x7 X X — —
9x9 XXXX
11x11 XXXX
37HS2
7x7 X — — —
9x9 X X X —
11x11 X X X —
37HS4
9x9 X — — —
11x11 X X — —
13x13 X X X —
*The 37HS1 unit with5x7size plenum is available with blank end only; mul-
tiple units of this size would not be used on one control.
NOTE: The conditions stated in Table 5 must be included in evaluations for
selecting the number of units in an air series.
26
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