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ADP-0244-05A - Installation Instructions

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Installation Instructions for HMI HOYME Adaptor 0244- 05A

Control Centre for One Furnace with Two Thermostats heating/cooling Two Separate Zones


Refer also to HOYME Installation Instructions for Replacement/Ventilation Air Control Damper, Series HAC. 


ADP-0244-05A - Interface Relay Adaptor  

      4” x 5” x 2 1/2”  (101 x 127 x 64 mm)

This Relay Adaptor (x2) is to be used in tandem as a control centre to operate one furnace with two separate thermostats to heat and cool two separate zones in a building. Two 24Vac Power Close dampers are also required. (See wire diagrams on page 2)

Two-damper zone control operation:

Two Air Control Dampers are required and are to be in the normally open position so that air from the furnace fan supplies air simultaneously to both zones. At such time as heating/cooling is require to a zone, the damper to the other zone closes thus allowing air to continue flowing to the zone of attention. If both zones ask for attention, both dampers remain open. At no time are both dampers closed while the furnace circulating fan is running. The call for air conditioning overrides the call for heat.

Fitness of this Adaptor/Damper combination, to satisfy air supply requirements for fuel fired appliances during operation of the Inter-connected exhaust fan(s), shall be investigated by the enforcing authorities.

 If an intake air duct is required, installation shall be in accordance with: In Canada - CAN/CSA B149 & B139; In the USA – ANSI/NFPA 54, 2006, ANSI Z223.1 and/or local codes including local codes relating to ventilation air duct installation.

 I.D.: ADP-0244-05A.  (Two required)
Adaptor comes with four 24Vac relays:
2 – DPDT, Coil 24Vac. Pts 24Vac- 5 Amps.
2 – SPDT, Coil 24Vac. Pts 24Vac- 5 Amps

General Installation:

- Refer to local and applicable codes.

‑ If an auxiliary transformer is required, use an approved 24Vac transformer of adequate capacity.

‑ Supply for the transformer primary shall be    taken from the line voltage supply of the appliance.  

‑ Always conduct a thorough check‑out after installation is complete.

‑ Affix appropriate labels and follow instructions and warnings on each label.

Adaptor Installation:

1. Turn off the power to the furnace.

2. Place adaptors side by side in the area of the furnace and identify each adaptor with a zone.

3. Connect each zone thermostat to its own adaptor as per wiring diagram.

4. Note: Connect each adaptor to each other with terminal #1 to terminal #2 of the other.

5. Connect each adaptor to the furnace terminals as per wiring diagram.

  Two zone damper installation: Before installing, test the dampers to power close with 24Vac.

 Note: Zone dampers are to be sized so that the air flow capacity of either damper does not overload the air flow capacity of the furnace. Use an atmospheric pressure damper as a bypass if necessary.

1. Install the two zone dampers as per instructions supplied with them.

2. Connect each zone damper to each zone adaptor as per wiring diagram. Recheck all wiring.

3. Turn thermostat to lowest setting and turn on power to the furnace.

4. Test at least three times for proper operation through heating/cooling cycles. 

Damper Identification:

For round dampers use the universal damper HAC-0X10-OPC where X = Diameter of damper, PC= Power Close.

For rectangular dampers use the custom made HCR - xxxx - OPC where xx - - = width, - - xx = height (also the motor side).

For rectangular slip-in dampers use the custom made HSI - xxxx - OPC where xx - - = width,- - xx = height (also the motor side).



Note: This marking is also on the inside cover of the Adaptor. 

Schematic Wire Diagram of Two ADP-0244-05A adaptors connected together.

This label is to be placed next to the wiring diagram of the appliance.

HMI HOYME Manufacturing Inc. 1-800-661-7382   www.hoyme.com


Installation instructions - Printer friendly (pdf)
ADP-0244-05A - Information Page

Last Updated (Thursday, 24 March 2016 11:19)