Honeywell 50027910-001 Installation Manual
50027910-001
Differential Pressure Switch
APPLICATION
SPECIFICATIONS
INSTALLATION INSTRUCTIONS
The Honeywell differential pressure switch senses
changes in duct air pressure to confirm air movement,
providing a safeguard that airflow is present during the
operation of installed IAQ equipment, including the
TrueSTEAM Humidification System.
M27300
Fig. 1. Pressure switch.
Table 1. Parts Included.
Item Quantity
Rubber Grommet
M27302
Tubing Fitting Elbow
M27323
2
2
Tubing, 1/4 in. ID 10 ft
Differential Pressure Switch (Fig. 1) 1
Screws, #8 x 3/4 in. sheet metal 2
Terminal Adaptor 2
SPST: normally open, snap-acting contacts
Pressure setpoint contacts: change at 0.04 in. W.C.
Electrical
5 amp resistive @ 24VAC
One common (C), One Normally Open (NO) quick-con-
nect terminals
Operating Temperature: -40F to 190F (-40C to 88C)
Pressure Sample Taps
Black positive pressure tap. 1/4 in. outside diameter
Grey negative pressure tap. 1/4 in. outside diameter
Use with 1/4 in. inside diameter tubing (10 ft provided)
4-13/64 (107)
3-13/16 (97)
5/64
(2)
FULL
R
[2] 1/4 (6)
IN MEXICO
ASSEMBLED
3
NC
Ø3/16
(5)
NEGATIVE
PRESSURE
PRESSURE
NORMALLY OPEN (NO)
TERMINAL 1/4 (6) X 1/32 (1)
THICK QUICK CONNECT
3/16
(5)
Ø3-1/4
(83)
[2] 1/2 (13)
C
1
1
2
3
2
3
2
NO
PI
+
2-1/64 (51)
3-15/16
(100)
PORT
POSITIVE
PORT
COMMON (C) TERMINAL
1/4 (6) X 1/32 (1) THICK
QUICK CONNECT
1-19/32 (41)
27/32
(21)
M27301
Fig. 2. Pressure switch dimensions.
Mounting position: mount vertically (upright) with Hon-
eywell logo right-side up.
Approvals
Underwriters Laboratories Inc. Approved: MP2168
Canadian Underwriter Laboratories Inc. Approved:
MP2168
69-2205-01
50027910-001 DIFFERENTIAL PRESSURE SWITCH
INSTALLATION
• Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition. This control must be installed in accordance
with the local code and regulations.
• Check ratings and descriptions given in the
Specifications section to ensure the product is suitable
for your application.
• Installer must be a trained, experienced service
technician.
IMPORTANT
Do not install the switch in an area where temperature exceeds rating of -40F to 190F (-40C to
88C)
1. Disconnect power from the TrueSTEAM before
installing.
2. Mount the switch vertically with pressure connectors facing down, using provided self-tapping
screws to secure the switch to the duct.
IMPORTANT
Calibration accuracy requires that the switch be
mounted vertically (as pictured in Fig. 3).
M27300
Fig. 3. Pressure switch—oriented vertically.
3. The return duct is recommended, however the
switch can also be mounted to the supply duct.
A
B
SUPPLY DUCT INSTALL - AIR LINE ONLY TO TAP A,
CONNECTED TO THE + PORT ON THE AIR FLOW SWITCH
RETURN DUCT INSTALL - AIR LINE ONLY TO TAP B,
CONNECTED TO THE – PORT ON THE AIR FLOW SWITCH
SUPPLY/RETURN DUCT INSTALL - AIR LINE CONNECTED
TO BOTH THE + AND – PORTS ON THE AIR FLOW SWITCH
M27303
Fig. 4. Mounting the pressure switch.
4. Cut a 3/4-in. diameter hole in the duct within 10 feet
of the switch to ensure the provided tubing reaches
the pressure tap elbow.
5. Insert the grommet into the duct hole, then insert
the tube elbow into the grommet.
6. Connect the tubing to the elbow fitting and the other
end to the applicable pressure connection on the
switch:
a. Black connection if installed on the supply
b. Grey connection if installed on the return
IMPORTANT
With low-speed airflow or variable speed systems it is recommended to run tubing to both the
supply and return ducts.
69-2205—01 2
INSIDE
OF DUCT
1
1
CONNECT TUBING TO + CONNECTION IF PRESSURE TAP IS
MOUNTED TO SUPPLY DUCT. CONNECT TO – IF PRESSURE
TAP IS MOUNTED TO RETURN DUCT.
M27304
Fig. 5. Install tubing.
NOTE: You may cut the tubing to fit the connection
length between the elbow fitting and switch. It is
also recommended to secure the hose to existing structures to avoid accidental disconnection.
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