BASO H91 User Manual

Installation Instructions
Issue Date February 22, 2013

H91 Series BASOTROL® Shutoff Gas Valve

Applications

The H91 Series BASOTROL valves are two-wire,
electrically operated shutoff valves that automatically
open and close on a demand signal from a thermostat
or other controlling device. These valves can be used
for gas-fired appliances with a maximum operating
pressure of 0.5 psi (35 mbar [3.5 kPa]).

Installation

IMPORTANT: Only qualified personnel should

install or service BASO® Gas Products. These
instructions are a guide for such personnel. Carefully
follow all instructions in this document and all
instructions for the appliance.

!

WARNING: Risk of Explosion, Fire, or

Electric Shock. Label all wires before they are

disconnected when replacing or servicing the H91.
Wiring errors can cause improper or dangerous
operation and may result in an explosion, fire, or
electric shock leading to severe personal injury or
death.

IMPORTANT: Verify that the valve is installed
only in applications where the specified maximum
ambient (surface) temperature and maximum
operating pressure does not exceed the limits in the

Technical Specifications section.

IMPORTANT: Make all gas installations in

accordance with applicable local, national, and
regional regulations.

!

CAUTION: Risk of Electric Shock.
Disconnect power supply before making electrical
connections to avoid electric shock.

!

WARNING: Risk of Explosion or Fire.
Shut off the gas supply at the main manual shutoff
valve before installing or servicing the H91. Failure
to shut off the gas supply can result in the release of
gas during installation or servicing, which can lead to
an explosion or fire, and may result in severe
personal injury or death.

To install the H91 Series valve:

1. Shut off power to the appliance.

2. Shut off the gas at the main manual shutoff valve.

3. Label each wire with the correct terminal
designation prior to disconnection.

4. Compare the voltage on the valve with the power
source voltage to ensure the correct unit is being
installed. For valves with 25-volt coils, use a
National Electrical Code (NEC), Class 2
transformer.

Note: The transformer must be mounted to a

grounded metal enclosure.

5. Ensure that the gas flows through the valve body
in the direction indicated by the “IN” and “OUT” or
by the arrow on the valve body. If the valve is
installed with the gas flow in the opposite
direction of the arrow, leakage can occur.

IMPORTANT: Do not use a wrench on any
surface other than the casting flats provided at the
inlet and outlet ends of the valve body. The H91 may
be damaged in the mounting process if a wrench is
used on any other surface. Using a wrench
incorrectly may void the warranty.

© 2013 BASO Gas Products 1

Part No. BASO-INS-H91, Rev. D www.baso.com

6. Mount the H91 valve on a horizontal manifold
with the magnetic operator pointed up (vertical) or
in a position not exceeding 90° from vertical. The
valve may also be mounted on a vertical manifold
in any position around its axis (Figure 1).

The H91L_, M_, or AM_ valves may be mounted
on a horizontal manifold only. The magnetic
operator should be in the upright position.

In Out

90º 90º

Horizontal mounting limited

to 90º from upright.

Vertica l mounti ng may

be 360º around its axi s

with the ga s f lo w

either up or down.

Figure 1: H91 Mounting Positions

7. Installer must be a trained, experienced, flame

safeguard control technician. Threads of the pipe
and nipples must be smooth and free of tears and
burrs. Steam clean all piping to remove foreign
substances such as cutting oil or thread chips. A
sediment trap should also be installed in
accordance with the National Fuel Gas Code
NFPA 54 (see Figure 3). Mount the valve to the
pipework, use a quality rated pipe tape, UL listed
seal material rated for gasoline, propane, and
other gases. If not available, a quality grade pipe
dope, a light amount on the male threads, starting
two threads away from the first engaging thread. If
pipe dope lodges on the valve seat, it will prevent
proper closure. Remove excess compound after
mounting the valve to the pipework.

!

WARNING: Risk of Explosion or Fire.
Verify that there are no gas leaks by testing with
appropriate equipment. Never use a match or lighter
to test for the presence of gas. Failure to test
properly can lead to an explosion or fire and may
result in severe personal injury or death.

7. Check for leakage:
a. Shut off the gas at the main manual shutoff

valve and open the pressure connection
between the manual shutoff valve and the H91
valve.

b. Connect air tubing with a maximum pressure

of 1-1/2 times the valve’s maximum operating
pressure (as indicated on the valve) to the
opened pressure connection.

c. Paint all valve body connections with a rich

soap and water solution.
If bubbles occur, this is an indication of a leak.

To stop a leak, tighten joints and connections.
Replace the part if the leak cannot be stopped.

If bubbles do not occur, remove the air tubing
and close the pressure connection.

8. Perform the Checkout section before leaving the
installation.

Wiring

!

WARNING: Risk of Shock.
Disconnect the power supply before making
electrical connections to avoid electrical shock or
equipment damage. Ensure that the operating
voltage is identical to the information on the product
identification label.

Non-Polarity Sensitive
Connections

Limit(s)

24 Volt

1

L1 (Hot)

L2 (Neu)

1

Power supply provide disconne ct
means and overload protection
as required.

Note

: Some valves may vary base d on style of conne ct io ns

Figure 2: Typical H91 Wiring

Thermostat

Safety

Control

2 H91 Series BASOTROL Shutoff Gas Valve Installation Instructions