Aprilaire 1150 Installation, Operation And Maintenance Manual page 37

7 . Re-install the chamber (see figure 31 for drawing item numbers):
• U sing both hands, lift the chamber (Item 6 in drawing) up around the heaters
until the threaded fasteners penetrate the cover flange .
• H old the chamber in place with one hand and pull the handle (Item 5)
toward you and up onto the threaded fastener on the front bottom of the
chamber . Make sure gasket is centered on chamber flange .
• P ush the handle up against the backing nut (Item 9) and run nut (Item 4)
up the threaded fastener so it holds the handle in place .
• T ighten nut (Items 2 and 3) down on the threaded fasteners extending
through the cover flange .
• T ighten nuts (Items 2, 3, and 4) to complete the process of returning
the chamber to its position prior to removal .
• R econnect the drain hose to the drain valve connection in the back
left corner .
• R econnect the drain valve electrical plug.
8 . Verify electrical connections:
• V erify that all power terminal screws and lugs are tight from power block to heaters.
• V erify that all electrical plugs located under the shroud are completely plugged in (transformer, contactor, drain valve,
and fill valve) .
• Check continuity of control relay (smaller top relay) on Model 1150. Replace if shorted.
9 . Move the drain valve lever back to the auto position .
10 . Turn on the water supply .
11 . Turn on the electrical power .
12 . Allow the steam chamber to fill with water and initiate a humidity demand
signal (see figure 32 for drawing item numbers) .
• I MPORTANT: Verify that the gasket seal is not leaking prior to
leaving the humidifier unattended.
– If a leak is observed in the left front or side of the gasket, loosen
backing nut (Item 7 in drawing) one turn and tighten fastener nut
(Item 2) down onto the cover flange . Continue this one turn at a time
until the leak stops .
– If a leak is observed in the right front or side of the gasket, loosen backing
nut (Item 8) one turn and tighten fastener nut (Item 3) down onto the cover
flange . Continue this one turn at a time until the leak stops .
– If a leak is observed in the rear of the steam chamber, loosen backing nut (Item 9) two turns and tighten up fastener nut
(Item 4) onto the handle . Continue this two turns at a time until the leak stops . Replace gasket if necessary .
13 . If this maintenance occurred at the end of a humidification season, turn the demand for humidity down to the minimum
setting and the humidifier will go into an end-of-season drain after 72 hours .
14 . If this maintenance occurred during the humidification season, turn the demand for humidity to the desired set point .
fIgURE 31 – Chamber with
Open fastener
2
Chamber cover
9
5
4
fIgURE 32 – Steam Chamber
with Closed fastener
2
7 Chamber cover
9
5
4
3
1
6
OM-4020
3
1
8
6
OM-4019
37