Honeywell HM700A1000, Installation Instructions Manual

HM700A1000

19

33-00118—01

Drain Valve Cleaning

Always clean the drain valve before installing a new cylinder. 

Scale from the spent cylinder may have fallen into the drain 

valve and could prevent its proper operation. To properly clean 

the drain valve it must be removed and disassembled.

1.

Disconnect spade terminals from the drain valve.

2.

Remove the two screws holding the valve to the drain 

pan.

3.

Squeeze the tabs of the spring clamp holding the hose 

to the drain valve and slide it up the hose. Pull hose 

from drain valve. Lift the drain valve from the drain pan.

4.

Unsnap red coil cap on solenoid and remove the sole-

noid from the valve.

5.

Loosen brass nut holding actuator to plastic housing 

with a wrench and disassemble actuator.

6.

Clean actuator components and valve housing (inlet 

port, outlet port, and cylinder port). Put new o-ring that 

was supplied with new cylinder into valve.

7.

Reassemble actuator making sure tapered end of 

spring is oriented as shown in Fig. 24. Tighten brass nut 

1/4 turn past hand tight.

8.

Clean out end of hose and reattach to valve. Slide hose 

clamp back in place and place valve into drain pan.

9.

Secure valve with 2 screws to drain pan.

Fig. 23. Drain valve.

Fig. 24. Drain valve actuator assembly.

Installing the New Cylinder

CAUTION

Make sure the new cylinder is a HM700ACYL2. Use 

of any other model or remanufactured cylinders 

will void the HM700 warranty.

1.

Insert cylinder into drain valve. Tilt cylinder forward and 

fit end of steam hose to steam outlet. Tip cylinder back 

into place.

2.

Tighten hose clamp being careful not to over tighten and 

crush the plastic cylinder steam outlet.

3.

Attach color-coded cylinder plugs to the corresponding 

color-coded cylinder pin. Push down completely. 

Connect high water sensor plug. Spring-loaded plugs 

should fit snuggly onto the cylinder pin. Replace if they 

are loose or damaged.

4.

Re-fasten tie strap.

5.

Replace the humidifier cover and secure with two 

screws.

6.

Turn on power to humidifier with the external 

disconnect.

7.

Open supply water shut off valve.

8.

Turn the humidifier On/Off /Drain switch to On.

CYLINDER PORT

AND O-RING

GROUND

WIRE

SOLENOID

SPADE

CONNECTORS

BRASS NUT

(ACTUATOR)

SCREWS

HOSE AND 

HOSE CLAMP

MCR35700

M35707

SLEEVE AND 

SOLENOID

SPRING

(NOTE ORIENTATION)

PLUNGER

ACTUATOR