McQuay 039398600 Installation Manual

Installation & Maintenance Data IM 763

Automatic Changeover Switch For Automatic Seasonal Changeover on Two-pipe Systems

Installation and maintenance are to be performed only by qualified personnel who are familiar with and in compliance with state, local and national codes and regulations, and experienced with this type of equipment. Caution: Sharp edges and

coil surfaces are a potential injury hazards. Avoid contact with them.

Group: Fan-coil Part Number: 106333101

Date: August 2002

These line voltage changeover switches are designed to switch a thermostat from heating to cooling based on a change in supply water temperature. The switches can be mounted on 5/8" or 7/8" O.D. copper tube or iron pipe.

Both models are easily mounted to the supply piping with a simple spring clip included with the thermostat.

Models

The 039398600 model (fig. 1) has 110 in. leads and is the standard changeover switch. The 06361801 model (fig. 2) has the same operating characteristics and includes 18 in. conduit and connector.

Both models are snap acting, SPDT switches.

Figure 1. Automatic Changeover Switch (Kit P/N 039398600)

110"

19/16"

11/4"

E.M.T. Connector

211/32"

Terminal No. 1 has a black wire and is the common (C) connected to valve (valve cycle) or to the yellow wire of the speed switch (fan cycle).

Terminal No. 2 has a red wire and is normally open (N.O.). Connected to the heating (red) wire of the thermostat.

Terminal No. 3 has a blue wire and is normally closed (N.C.). Connected to the cooling (blue) wire of the thermostat.

At approximately 65°F, plus or minus 6°F, terminals 1 and 3 are closed and terminals 1 and 2 are open. At 95°F, plus or minus 6°F, terminals 1 and 2 are closed and terminals 1 and 3 are open.

Specifications

Electrical Rating

Model Voltage FLA LRA Restive

039398600 061361801

Changeover Range: 65°F to 95°F (18°C to 35°C)

Maximum Operating Temperature Limits:

Agency Approval: UL Listed, CSA Approved

24 – 240 15 – 5 90 – 30 25

220°F Fluid Temperature @ 125°F Ambient (104°C Fluid Temperature @ 52°C Ambient)

19/16"

Terminal No. 1 Terminal No. 2 Terminal No. 3

Type 14TC33

Open Temp Term. 1 and 3, 95°F ± 6 Close Temp Term. 1 and 3, 65°F ± 6

U.L. File – E29653 U.L. Guide – SDFY2 Volts – 120 Amps – 25

Black 60455 (Common) Red 60456 (N.O.) – Heating Blue 60457 (N.C.) – Cooling

/64"

The specifications above are nominal and conform to generally acceptable industry standards. McQuay International is not responsible for damages resulting from misapplication or misuse of its products.

Figure 2. Automatic Changeover Switch (Kit P/N 061361801)

18"

IM 763