Honeywell VP525C, Engineering Manual, Page: 11 / 228

Humidistats
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70-6925 3
HP972 Pneumatic Humidistat
A proportioning pneumatic humidistat used on one- or two-pipe
installations for controlling actuators on valves and dampers in air
conditioning systems for humidification or dehumidification
control.
• Durable HP970 series humidistat.
• Snap-on mounting to backplate.
• Vertical or horizontal mounting.
• Backplate has molded air connections; no separate fittings needed.
• Variety of cover finishes and display styles available.
• Wide throttling range.
Typical Two-Pipe HP972B Hook-up Typical One-pipe HP972B Hook-up
Application: Humidity
Dimensions, Approximate: 3 1/4 in. high x 2 in. wide x 1 5/8 in. deep
(83 mm high x 51 mm wide x 41 mm deep)
Airflow Usage: 0.011 scfm (5.2 mL/s)
Maximum Operating Temperature:
45 F to 125 F (7 C to 52 C)
Maximum Storage Temperature: -30 to +150 F (-34 to +66 C)
Maximum Operating Pressure:
25 psi (170 kPa)
Accessories:
14002430-001 Thermostat Guard
14002362-001 Duct Sampling Chamber
14004406-124 Humidistat Cover assembly Satin Chrome with setpoint
display and Honeywell logo for vertical mounting, scale range 15 to
75% RH
14003192-001 Wallplate adapter kit. Adapts HP970 or TP970 series
stats to HP900 and TP900 flush mounted and TP910 series flush or
surface mounted installations
305965 1-1/2 in. diameter, 1/8 NPT center stem back mount Pressure
Indicating gauge (0 to 30 psi scale) with +/- 4% accuracy
AK3863 Honeywell Thermostat Tool Kit, TP970/TP900
CCT729A Gauge Adapter for Calibration. Add 305965 0 to 30 psi
gauge for Complete Tool.
CCT735A Thermostat Calibration Tool includes Allen wrench for cover
installation.
For additional covers, see Humidistat Cover Assemblies
Replacement Parts:
14001865-001 Filter Cartridge Assembly
14002496-003 Nylon element assembly, with Spring
14002573-001 Modernization Kit to convert all 1 & 2 pipe Honeywell &
competitive pneumatic stats to TP970, TP971A, TP972, TP973,
TP974, TP9600 family; HP970, HP971 and HP972
14002374-004 Restrictor Block Assembly,.005 in., For TP970A-D;
TP971A-E except C; TP972A; TP973A-B; TP9600 family; HP970A-B;
and HP972B
14002053-001 Back Plate Assembly
C3225
N.C.
M
M B
HUMIDIFIER
VALVE
SUPPLY
HP972B
C3226
N.C.
M
M B
HUMIDIFIER
VALVE
SUPPLY
HP972B
.005
RESTRICTION
(BLUE)
Product Number Action
Number of
Pipes Scale Range (% RH) Throttling Range (% RH) Setpoint Comments
HP972B1005 Reverse Acting 1 or 2 15 to 75% RH 7 to 35% RH Single Order Cover Separately